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

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/wireless.h>
  19 #include <linux/random.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/iw_handler.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  32 #define IEEE80211_AUTH_MAX_TRIES 3
  33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  34 #define IEEE80211_ASSOC_MAX_TRIES 3
  35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  41
  42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  44
  45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  46
  47
  48 /* utils */
  49 static int ecw2cw(int ecw)
  50 {
  51         return (1 << ecw) - 1;
  52 }
  53
  54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  55 {
  56         u8 *end, *pos;
  57
  58         pos = bss->ies;
  59         if (pos == NULL)
  60                 return NULL;
  61         end = pos + bss->ies_len;
  62
  63         while (pos + 1 < end) {
  64                 if (pos + 2 + pos[1] > end)
  65                         break;
  66                 if (pos[0] == ie)
  67                         return pos;
  68                 pos += 2 + pos[1];
  69         }
  70
  71         return NULL;
  72 }
  73
  74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  75                                       struct ieee80211_supported_band *sband,
  76                                       u64 *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 u64 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         u64 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 /* also used by scanning code */
 135 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 136                               u8 *ssid, size_t ssid_len)
 137 {
 138         struct ieee80211_local *local = sdata->local;
 139         struct ieee80211_supported_band *sband;
 140         struct sk_buff *skb;
 141         struct ieee80211_mgmt *mgmt;
 142         u8 *pos, *supp_rates, *esupp_rates = NULL;
 143         int i;
 144
 145         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
 146         if (!skb) {
 147                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 148                        "request\n", sdata->dev->name);
 149                 return;
 150         }
 151         skb_reserve(skb, local->hw.extra_tx_headroom);
 152
 153         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 154         memset(mgmt, 0, 24);
 155         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 156                                           IEEE80211_STYPE_PROBE_REQ);
 157         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 158         if (dst) {
 159                 memcpy(mgmt->da, dst, ETH_ALEN);
 160                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 161         } else {
 162                 memset(mgmt->da, 0xff, ETH_ALEN);
 163                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 164         }
 165         pos = skb_put(skb, 2 + ssid_len);
 166         *pos++ = WLAN_EID_SSID;
 167         *pos++ = ssid_len;
 168         memcpy(pos, ssid, ssid_len);
 169
 170         supp_rates = skb_put(skb, 2);
 171         supp_rates[0] = WLAN_EID_SUPP_RATES;
 172         supp_rates[1] = 0;
 173         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 174
 175         for (i = 0; i < sband->n_bitrates; i++) {
 176                 struct ieee80211_rate *rate = &sband->bitrates[i];
 177                 if (esupp_rates) {
 178                         pos = skb_put(skb, 1);
 179                         esupp_rates[1]++;
 180                 } else if (supp_rates[1] == 8) {
 181                         esupp_rates = skb_put(skb, 3);
 182                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 183                         esupp_rates[1] = 1;
 184                         pos = &esupp_rates[2];
 185                 } else {
 186                         pos = skb_put(skb, 1);
 187                         supp_rates[1]++;
 188                 }
 189                 *pos = rate->bitrate / 5;
 190         }
 191
 192         ieee80211_tx_skb(sdata, skb, 0);
 193 }
 194
 195 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 196                                 struct ieee80211_if_sta *ifsta,
 197                                 int transaction, u8 *extra, size_t extra_len,
 198                                 int encrypt)
 199 {
 200         struct ieee80211_local *local = sdata->local;
 201         struct sk_buff *skb;
 202         struct ieee80211_mgmt *mgmt;
 203
 204         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 205                             sizeof(*mgmt) + 6 + extra_len);
 206         if (!skb) {
 207                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 208                        "frame\n", sdata->dev->name);
 209                 return;
 210         }
 211         skb_reserve(skb, local->hw.extra_tx_headroom);
 212
 213         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 214         memset(mgmt, 0, 24 + 6);
 215         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 216                                           IEEE80211_STYPE_AUTH);
 217         if (encrypt)
 218                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 219         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 220         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 221         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 222         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 223         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 224         ifsta->auth_transaction = transaction + 1;
 225         mgmt->u.auth.status_code = cpu_to_le16(0);
 226         if (extra)
 227                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 228
 229         ieee80211_tx_skb(sdata, skb, encrypt);
 230 }
 231
 232 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 233                                  struct ieee80211_if_sta *ifsta)
 234 {
 235         struct ieee80211_local *local = sdata->local;
 236         struct sk_buff *skb;
 237         struct ieee80211_mgmt *mgmt;
 238         u8 *pos, *ies, *ht_ie;
 239         int i, len, count, rates_len, supp_rates_len;
 240         u16 capab;
 241         struct ieee80211_bss *bss;
 242         int wmm = 0;
 243         struct ieee80211_supported_band *sband;
 244         u64 rates = 0;
 245
 246         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 247                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 248                             ifsta->ssid_len);
 249         if (!skb) {
 250                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 251                        "frame\n", sdata->dev->name);
 252                 return;
 253         }
 254         skb_reserve(skb, local->hw.extra_tx_headroom);
 255
 256         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 257
 258         capab = ifsta->capab;
 259
 260         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 261                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 262                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 263                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 264                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 265         }
 266
 267         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 268                                    local->hw.conf.channel->center_freq,
 269                                    ifsta->ssid, ifsta->ssid_len);
 270         if (bss) {
 271                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 272                         capab |= WLAN_CAPABILITY_PRIVACY;
 273                 if (bss->wmm_used)
 274                         wmm = 1;
 275
 276                 /* get all rates supported by the device and the AP as
 277                  * some APs don't like getting a superset of their rates
 278                  * in the association request (e.g. D-Link DAP 1353 in
 279                  * b-only mode) */
 280                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 281
 282                 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 283                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 284                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 285
 286                 ieee80211_rx_bss_put(local, bss);
 287         } else {
 288                 rates = ~0;
 289                 rates_len = sband->n_bitrates;
 290         }
 291
 292         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 293         memset(mgmt, 0, 24);
 294         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 295         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 296         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 297
 298         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 299                 skb_put(skb, 10);
 300                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 301                                                   IEEE80211_STYPE_REASSOC_REQ);
 302                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 303                 mgmt->u.reassoc_req.listen_interval =
 304                                 cpu_to_le16(local->hw.conf.listen_interval);
 305                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 306                        ETH_ALEN);
 307         } else {
 308                 skb_put(skb, 4);
 309                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 310                                                   IEEE80211_STYPE_ASSOC_REQ);
 311                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 312                 mgmt->u.reassoc_req.listen_interval =
 313                                 cpu_to_le16(local->hw.conf.listen_interval);
 314         }
 315
 316         /* SSID */
 317         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 318         *pos++ = WLAN_EID_SSID;
 319         *pos++ = ifsta->ssid_len;
 320         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 321
 322         /* add all rates which were marked to be used above */
 323         supp_rates_len = rates_len;
 324         if (supp_rates_len > 8)
 325                 supp_rates_len = 8;
 326
 327         len = sband->n_bitrates;
 328         pos = skb_put(skb, supp_rates_len + 2);
 329         *pos++ = WLAN_EID_SUPP_RATES;
 330         *pos++ = supp_rates_len;
 331
 332         count = 0;
 333         for (i = 0; i < sband->n_bitrates; i++) {
 334                 if (BIT(i) & rates) {
 335                         int rate = sband->bitrates[i].bitrate;
 336                         *pos++ = (u8) (rate / 5);
 337                         if (++count == 8)
 338                                 break;
 339                 }
 340         }
 341
 342         if (rates_len > count) {
 343                 pos = skb_put(skb, rates_len - count + 2);
 344                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 345                 *pos++ = rates_len - count;
 346
 347                 for (i++; i < sband->n_bitrates; i++) {
 348                         if (BIT(i) & rates) {
 349                                 int rate = sband->bitrates[i].bitrate;
 350                                 *pos++ = (u8) (rate / 5);
 351                         }
 352                 }
 353         }
 354
 355         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 356                 /* 1. power capabilities */
 357                 pos = skb_put(skb, 4);
 358                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 359                 *pos++ = 2;
 360                 *pos++ = 0; /* min tx power */
 361                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 362
 363                 /* 2. supported channels */
 364                 /* TODO: get this in reg domain format */
 365                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 366                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 367                 *pos++ = 2 * sband->n_channels;
 368                 for (i = 0; i < sband->n_channels; i++) {
 369                         *pos++ = ieee80211_frequency_to_channel(
 370                                         sband->channels[i].center_freq);
 371                         *pos++ = 1; /* one channel in the subband*/
 372                 }
 373         }
 374
 375         if (ifsta->extra_ie) {
 376                 pos = skb_put(skb, ifsta->extra_ie_len);
 377                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 378         }
 379
 380         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 381                 pos = skb_put(skb, 9);
 382                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 383                 *pos++ = 7; /* len */
 384                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 385                 *pos++ = 0x50;
 386                 *pos++ = 0xf2;
 387                 *pos++ = 2; /* WME */
 388                 *pos++ = 0; /* WME info */
 389                 *pos++ = 1; /* WME ver */
 390                 *pos++ = 0;
 391         }
 392
 393         /* wmm support is a must to HT */
 394         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
 395             sband->ht_cap.ht_supported &&
 396             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 397             ht_ie[1] >= sizeof(struct ieee80211_ht_info)) {
 398                 struct ieee80211_ht_info *ht_info =
 399                         (struct ieee80211_ht_info *)(ht_ie + 2);
 400                 u16 cap = sband->ht_cap.cap;
 401                 __le16 tmp;
 402                 u32 flags = local->hw.conf.channel->flags;
 403
 404                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 405                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 406                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 407                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 408                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 409                         }
 410                         break;
 411                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 412                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 413                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 414                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 415                         }
 416                         break;
 417                 }
 418
 419                 tmp = cpu_to_le16(cap);
 420                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 421                 *pos++ = WLAN_EID_HT_CAPABILITY;
 422                 *pos++ = sizeof(struct ieee80211_ht_cap);
 423                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 424                 memcpy(pos, &tmp, sizeof(u16));
 425                 pos += sizeof(u16);
 426                 /* TODO: needs a define here for << 2 */
 427                 *pos++ = sband->ht_cap.ampdu_factor |
 428                          (sband->ht_cap.ampdu_density << 2);
 429                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 430         }
 431
 432         kfree(ifsta->assocreq_ies);
 433         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 434         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 435         if (ifsta->assocreq_ies)
 436                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 437
 438         ieee80211_tx_skb(sdata, skb, 0);
 439 }
 440
 441
 442 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 443                                            u16 stype, u16 reason)
 444 {
 445         struct ieee80211_local *local = sdata->local;
 446         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 447         struct sk_buff *skb;
 448         struct ieee80211_mgmt *mgmt;
 449
 450         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 451         if (!skb) {
 452                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 453                        "deauth/disassoc frame\n", sdata->dev->name);
 454                 return;
 455         }
 456         skb_reserve(skb, local->hw.extra_tx_headroom);
 457
 458         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 459         memset(mgmt, 0, 24);
 460         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 461         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 462         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 463         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 464         skb_put(skb, 2);
 465         /* u.deauth.reason_code == u.disassoc.reason_code */
 466         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 467
 468         ieee80211_tx_skb(sdata, skb, 0);
 469 }
 470
 471 /* MLME */
 472 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 473                                          struct ieee80211_bss *bss)
 474 {
 475         struct ieee80211_local *local = sdata->local;
 476         int i, have_higher_than_11mbit = 0;
 477
 478         /* cf. IEEE 802.11 9.2.12 */
 479         for (i = 0; i < bss->supp_rates_len; i++)
 480                 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
 481                         have_higher_than_11mbit = 1;
 482
 483         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 484             have_higher_than_11mbit)
 485                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 486         else
 487                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 488
 489         ieee80211_set_wmm_default(sdata);
 490 }
 491
 492 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 493                                      struct ieee80211_if_sta *ifsta,
 494                                      u8 *wmm_param, size_t wmm_param_len)
 495 {
 496         struct ieee80211_tx_queue_params params;
 497         size_t left;
 498         int count;
 499         u8 *pos;
 500
 501         if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
 502                 return;
 503
 504         if (!wmm_param)
 505                 return;
 506
 507         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 508                 return;
 509         count = wmm_param[6] & 0x0f;
 510         if (count == ifsta->wmm_last_param_set)
 511                 return;
 512         ifsta->wmm_last_param_set = count;
 513
 514         pos = wmm_param + 8;
 515         left = wmm_param_len - 8;
 516
 517         memset(&params, 0, sizeof(params));
 518
 519         if (!local->ops->conf_tx)
 520                 return;
 521
 522         local->wmm_acm = 0;
 523         for (; left >= 4; left -= 4, pos += 4) {
 524                 int aci = (pos[0] >> 5) & 0x03;
 525                 int acm = (pos[0] >> 4) & 0x01;
 526                 int queue;
 527
 528                 switch (aci) {
 529                 case 1:
 530                         queue = 3;
 531                         if (acm)
 532                                 local->wmm_acm |= BIT(0) | BIT(3);
 533                         break;
 534                 case 2:
 535                         queue = 1;
 536                         if (acm)
 537                                 local->wmm_acm |= BIT(4) | BIT(5);
 538                         break;
 539                 case 3:
 540                         queue = 0;
 541                         if (acm)
 542                                 local->wmm_acm |= BIT(6) | BIT(7);
 543                         break;
 544                 case 0:
 545                 default:
 546                         queue = 2;
 547                         if (acm)
 548                                 local->wmm_acm |= BIT(1) | BIT(2);
 549                         break;
 550                 }
 551
 552                 params.aifs = pos[0] & 0x0f;
 553                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 554                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 555                 params.txop = get_unaligned_le16(pos + 2);
 556 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 557                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 558                        "cWmin=%d cWmax=%d txop=%d\n",
 559                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 560                        params.cw_max, params.txop);
 561 #endif
 562                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 563                  * AC for now) */
 564                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 565                         printk(KERN_DEBUG "%s: failed to set TX queue "
 566                                "parameters for queue %d\n", local->mdev->name, queue);
 567                 }
 568         }
 569 }
 570
 571 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 572                                            u16 capab, bool erp_valid, u8 erp)
 573 {
 574         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 575 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 576         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 577 #endif
 578         u32 changed = 0;
 579         bool use_protection;
 580         bool use_short_preamble;
 581         bool use_short_slot;
 582
 583         if (erp_valid) {
 584                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 585                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 586         } else {
 587                 use_protection = false;
 588                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 589         }
 590
 591         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 592
 593         if (use_protection != bss_conf->use_cts_prot) {
 594 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 595                 if (net_ratelimit()) {
 596                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 597                                sdata->dev->name,
 598                                use_protection ? "enabled" : "disabled",
 599                                ifsta->bssid);
 600                 }
 601 #endif
 602                 bss_conf->use_cts_prot = use_protection;
 603                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 604         }
 605
 606         if (use_short_preamble != bss_conf->use_short_preamble) {
 607 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 608                 if (net_ratelimit()) {
 609                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 610                                " (BSSID=%pM)\n",
 611                                sdata->dev->name,
 612                                use_short_preamble ? "short" : "long",
 613                                ifsta->bssid);
 614                 }
 615 #endif
 616                 bss_conf->use_short_preamble = use_short_preamble;
 617                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 618         }
 619
 620         if (use_short_slot != bss_conf->use_short_slot) {
 621 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 622                 if (net_ratelimit()) {
 623                         printk(KERN_DEBUG "%s: switched to %s slot"
 624                                " (BSSID=%s)\n",
 625                                sdata->dev->name,
 626                                use_short_slot ? "short" : "long",
 627                                ifsta->bssid);
 628                 }
 629 #endif
 630                 bss_conf->use_short_slot = use_short_slot;
 631                 changed |= BSS_CHANGED_ERP_SLOT;
 632         }
 633
 634         return changed;
 635 }
 636
 637 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
 638                                         struct ieee80211_if_sta *ifsta)
 639 {
 640         union iwreq_data wrqu;
 641         memset(&wrqu, 0, sizeof(wrqu));
 642         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
 643                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 644         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 645         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 646 }
 647
 648 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
 649                                          struct ieee80211_if_sta *ifsta)
 650 {
 651         char *buf;
 652         size_t len;
 653         int i;
 654         union iwreq_data wrqu;
 655
 656         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 657                 return;
 658
 659         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 660                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 661         if (!buf)
 662                 return;
 663
 664         len = sprintf(buf, "ASSOCINFO(");
 665         if (ifsta->assocreq_ies) {
 666                 len += sprintf(buf + len, "ReqIEs=");
 667                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 668                         len += sprintf(buf + len, "%02x",
 669                                        ifsta->assocreq_ies[i]);
 670                 }
 671         }
 672         if (ifsta->assocresp_ies) {
 673                 if (ifsta->assocreq_ies)
 674                         len += sprintf(buf + len, " ");
 675                 len += sprintf(buf + len, "RespIEs=");
 676                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 677                         len += sprintf(buf + len, "%02x",
 678                                        ifsta->assocresp_ies[i]);
 679                 }
 680         }
 681         len += sprintf(buf + len, ")");
 682
 683         if (len > IW_CUSTOM_MAX) {
 684                 len = sprintf(buf, "ASSOCRESPIE=");
 685                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 686                         len += sprintf(buf + len, "%02x",
 687                                        ifsta->assocresp_ies[i]);
 688                 }
 689         }
 690
 691         if (len <= IW_CUSTOM_MAX) {
 692                 memset(&wrqu, 0, sizeof(wrqu));
 693                 wrqu.data.length = len;
 694                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 695         }
 696
 697         kfree(buf);
 698 }
 699
 700
 701 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 702                                      struct ieee80211_if_sta *ifsta,
 703                                      u32 bss_info_changed)
 704 {
 705         struct ieee80211_local *local = sdata->local;
 706         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 707
 708         struct ieee80211_bss *bss;
 709
 710         bss_info_changed |= BSS_CHANGED_ASSOC;
 711         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 712
 713         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 714                 return;
 715
 716         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 717                                    conf->channel->center_freq,
 718                                    ifsta->ssid, ifsta->ssid_len);
 719         if (bss) {
 720                 /* set timing information */
 721                 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
 722                 sdata->vif.bss_conf.timestamp = bss->timestamp;
 723                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 724
 725                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 726                         bss->capability, bss->has_erp_value, bss->erp_value);
 727
 728                 ieee80211_rx_bss_put(local, bss);
 729         }
 730
 731         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 732         memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 733         ieee80211_sta_send_associnfo(sdata, ifsta);
 734
 735         ifsta->last_probe = jiffies;
 736         ieee80211_led_assoc(local, 1);
 737
 738         sdata->vif.bss_conf.assoc = 1;
 739         /*
 740          * For now just always ask the driver to update the basic rateset
 741          * when we have associated, we aren't checking whether it actually
 742          * changed or not.
 743          */
 744         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 745         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 746
 747         netif_tx_start_all_queues(sdata->dev);
 748         netif_carrier_on(sdata->dev);
 749
 750         ieee80211_sta_send_apinfo(sdata, ifsta);
 751 }
 752
 753 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 754                                    struct ieee80211_if_sta *ifsta)
 755 {
 756         ifsta->direct_probe_tries++;
 757         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 758                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 759                        sdata->dev->name, ifsta->bssid);
 760                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 761                 ieee80211_sta_send_apinfo(sdata, ifsta);
 762                 return;
 763         }
 764
 765         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 766                         sdata->dev->name, ifsta->bssid,
 767                         ifsta->direct_probe_tries);
 768
 769         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 770
 771         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
 772
 773         /* Direct probe is sent to broadcast address as some APs
 774          * will not answer to direct packet in unassociated state.
 775          */
 776         ieee80211_send_probe_req(sdata, NULL,
 777                                  ifsta->ssid, ifsta->ssid_len);
 778
 779         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 780 }
 781
 782
 783 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 784                                    struct ieee80211_if_sta *ifsta)
 785 {
 786         ifsta->auth_tries++;
 787         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 788                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 789                        " timed out\n",
 790                        sdata->dev->name, ifsta->bssid);
 791                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 792                 ieee80211_sta_send_apinfo(sdata, ifsta);
 793                 return;
 794         }
 795
 796         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
 797         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 798                sdata->dev->name, ifsta->bssid);
 799
 800         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
 801
 802         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 803 }
 804
 805 /*
 806  * The disassoc 'reason' argument can be either our own reason
 807  * if self disconnected or a reason code from the AP.
 808  */
 809 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 810                                    struct ieee80211_if_sta *ifsta, bool deauth,
 811                                    bool self_disconnected, u16 reason)
 812 {
 813         struct ieee80211_local *local = sdata->local;
 814         struct sta_info *sta;
 815         u32 changed = 0;
 816
 817         rcu_read_lock();
 818
 819         sta = sta_info_get(local, ifsta->bssid);
 820         if (!sta) {
 821                 rcu_read_unlock();
 822                 return;
 823         }
 824
 825         if (deauth) {
 826                 ifsta->direct_probe_tries = 0;
 827                 ifsta->auth_tries = 0;
 828         }
 829         ifsta->assoc_scan_tries = 0;
 830         ifsta->assoc_tries = 0;
 831
 832         netif_tx_stop_all_queues(sdata->dev);
 833         netif_carrier_off(sdata->dev);
 834
 835         ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
 836
 837         if (self_disconnected) {
 838                 if (deauth)
 839                         ieee80211_send_deauth_disassoc(sdata,
 840                                 IEEE80211_STYPE_DEAUTH, reason);
 841                 else
 842                         ieee80211_send_deauth_disassoc(sdata,
 843                                 IEEE80211_STYPE_DISASSOC, reason);
 844         }
 845
 846         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 847         changed |= ieee80211_reset_erp_info(sdata);
 848
 849         ieee80211_led_assoc(local, 0);
 850         changed |= BSS_CHANGED_ASSOC;
 851         sdata->vif.bss_conf.assoc = false;
 852
 853         ieee80211_sta_send_apinfo(sdata, ifsta);
 854
 855         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
 856                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 857
 858         rcu_read_unlock();
 859
 860         local->hw.conf.ht.enabled = false;
 861         local->oper_channel_type = NL80211_CHAN_NO_HT;
 862         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_HT);
 863
 864         ieee80211_bss_info_change_notify(sdata, changed);
 865
 866         rcu_read_lock();
 867
 868         sta = sta_info_get(local, ifsta->bssid);
 869         if (!sta) {
 870                 rcu_read_unlock();
 871                 return;
 872         }
 873
 874         sta_info_unlink(&sta);
 875
 876         rcu_read_unlock();
 877
 878         sta_info_destroy(sta);
 879 }
 880
 881 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 882 {
 883         if (!sdata || !sdata->default_key ||
 884             sdata->default_key->conf.alg != ALG_WEP)
 885                 return 0;
 886         return 1;
 887 }
 888
 889 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
 890                                       struct ieee80211_if_sta *ifsta)
 891 {
 892         struct ieee80211_local *local = sdata->local;
 893         struct ieee80211_bss *bss;
 894         int bss_privacy;
 895         int wep_privacy;
 896         int privacy_invoked;
 897
 898         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
 899                 return 0;
 900
 901         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 902                                    local->hw.conf.channel->center_freq,
 903                                    ifsta->ssid, ifsta->ssid_len);
 904         if (!bss)
 905                 return 0;
 906
 907         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
 908         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
 909         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
 910
 911         ieee80211_rx_bss_put(local, bss);
 912
 913         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 914                 return 0;
 915
 916         return 1;
 917 }
 918
 919 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
 920                                 struct ieee80211_if_sta *ifsta)
 921 {
 922         ifsta->assoc_tries++;
 923         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 924                 printk(KERN_DEBUG "%s: association with AP %pM"
 925                        " timed out\n",
 926                        sdata->dev->name, ifsta->bssid);
 927                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 928                 ieee80211_sta_send_apinfo(sdata, ifsta);
 929                 return;
 930         }
 931
 932         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
 933         printk(KERN_DEBUG "%s: associate with AP %pM\n",
 934                sdata->dev->name, ifsta->bssid);
 935         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
 936                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 937                        "mixed-cell disabled - abort association\n", sdata->dev->name);
 938                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 939                 return;
 940         }
 941
 942         ieee80211_send_assoc(sdata, ifsta);
 943
 944         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 945 }
 946
 947
 948 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
 949                                  struct ieee80211_if_sta *ifsta)
 950 {
 951         struct ieee80211_local *local = sdata->local;
 952         struct sta_info *sta;
 953         int disassoc;
 954
 955         /* TODO: start monitoring current AP signal quality and number of
 956          * missed beacons. Scan other channels every now and then and search
 957          * for better APs. */
 958         /* TODO: remove expired BSSes */
 959
 960         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
 961
 962         rcu_read_lock();
 963
 964         sta = sta_info_get(local, ifsta->bssid);
 965         if (!sta) {
 966                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
 967                        sdata->dev->name, ifsta->bssid);
 968                 disassoc = 1;
 969         } else {
 970                 disassoc = 0;
 971                 if (time_after(jiffies,
 972                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 973                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
 974                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 975                                        "current AP %pM - assume out of "
 976                                        "range\n",
 977                                        sdata->dev->name, ifsta->bssid);
 978                                 disassoc = 1;
 979                         } else
 980                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
 981                                                          ifsta->ssid,
 982                                                          ifsta->ssid_len);
 983                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 984                 } else {
 985                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 986                         if (time_after(jiffies, ifsta->last_probe +
 987                                        IEEE80211_PROBE_INTERVAL)) {
 988                                 ifsta->last_probe = jiffies;
 989                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
 990                                                          ifsta->ssid,
 991                                                          ifsta->ssid_len);
 992                         }
 993                 }
 994         }
 995
 996         rcu_read_unlock();
 997
 998         if (disassoc)
 999                 ieee80211_set_disassoc(sdata, ifsta, true, true,
1000                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1001         else
1002                 mod_timer(&ifsta->timer, jiffies +
1003                                       IEEE80211_MONITORING_INTERVAL);
1004 }
1005
1006
1007 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1008                                      struct ieee80211_if_sta *ifsta)
1009 {
1010         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1011         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1012         ieee80211_associate(sdata, ifsta);
1013 }
1014
1015
1016 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1017                                      struct ieee80211_if_sta *ifsta,
1018                                      struct ieee80211_mgmt *mgmt,
1019                                      size_t len)
1020 {
1021         u8 *pos;
1022         struct ieee802_11_elems elems;
1023
1024         pos = mgmt->u.auth.variable;
1025         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1026         if (!elems.challenge)
1027                 return;
1028         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1029                             elems.challenge_len + 2, 1);
1030 }
1031
1032 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1033                                    struct ieee80211_if_sta *ifsta,
1034                                    struct ieee80211_mgmt *mgmt,
1035                                    size_t len)
1036 {
1037         u16 auth_alg, auth_transaction, status_code;
1038
1039         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1040             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1041                 return;
1042
1043         if (len < 24 + 6)
1044                 return;
1045
1046         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1047             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1048                 return;
1049
1050         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1051             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1052                 return;
1053
1054         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1055         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1056         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1057
1058         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1059                 /*
1060                  * IEEE 802.11 standard does not require authentication in IBSS
1061                  * networks and most implementations do not seem to use it.
1062                  * However, try to reply to authentication attempts if someone
1063                  * has actually implemented this.
1064                  */
1065                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1066                         return;
1067                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1068         }
1069
1070         if (auth_alg != ifsta->auth_alg ||
1071             auth_transaction != ifsta->auth_transaction)
1072                 return;
1073
1074         if (status_code != WLAN_STATUS_SUCCESS) {
1075                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1076                         u8 algs[3];
1077                         const int num_algs = ARRAY_SIZE(algs);
1078                         int i, pos;
1079                         algs[0] = algs[1] = algs[2] = 0xff;
1080                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1081                                 algs[0] = WLAN_AUTH_OPEN;
1082                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1083                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1084                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1085                                 algs[2] = WLAN_AUTH_LEAP;
1086                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1087                                 pos = 0;
1088                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1089                                 pos = 1;
1090                         else
1091                                 pos = 2;
1092                         for (i = 0; i < num_algs; i++) {
1093                                 pos++;
1094                                 if (pos >= num_algs)
1095                                         pos = 0;
1096                                 if (algs[pos] == ifsta->auth_alg ||
1097                                     algs[pos] == 0xff)
1098                                         continue;
1099                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1100                                     !ieee80211_sta_wep_configured(sdata))
1101                                         continue;
1102                                 ifsta->auth_alg = algs[pos];
1103                                 break;
1104                         }
1105                 }
1106                 return;
1107         }
1108
1109         switch (ifsta->auth_alg) {
1110         case WLAN_AUTH_OPEN:
1111         case WLAN_AUTH_LEAP:
1112                 ieee80211_auth_completed(sdata, ifsta);
1113                 break;
1114         case WLAN_AUTH_SHARED_KEY:
1115                 if (ifsta->auth_transaction == 4)
1116                         ieee80211_auth_completed(sdata, ifsta);
1117                 else
1118                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1119                 break;
1120         }
1121 }
1122
1123
1124 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1125                                      struct ieee80211_if_sta *ifsta,
1126                                      struct ieee80211_mgmt *mgmt,
1127                                      size_t len)
1128 {
1129         u16 reason_code;
1130
1131         if (len < 24 + 2)
1132                 return;
1133
1134         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1135                 return;
1136
1137         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1138
1139         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1140                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1141                                 sdata->dev->name, reason_code);
1142
1143         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1144             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1145             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1146                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1147                 mod_timer(&ifsta->timer, jiffies +
1148                                       IEEE80211_RETRY_AUTH_INTERVAL);
1149         }
1150
1151         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1152         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1153 }
1154
1155
1156 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1157                                        struct ieee80211_if_sta *ifsta,
1158                                        struct ieee80211_mgmt *mgmt,
1159                                        size_t len)
1160 {
1161         u16 reason_code;
1162
1163         if (len < 24 + 2)
1164                 return;
1165
1166         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1167                 return;
1168
1169         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1170
1171         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1172                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1173                                 sdata->dev->name, reason_code);
1174
1175         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1176                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1177                 mod_timer(&ifsta->timer, jiffies +
1178                                       IEEE80211_RETRY_AUTH_INTERVAL);
1179         }
1180
1181         ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1182 }
1183
1184
1185 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1186                                          struct ieee80211_if_sta *ifsta,
1187                                          struct ieee80211_mgmt *mgmt,
1188                                          size_t len,
1189                                          int reassoc)
1190 {
1191         struct ieee80211_local *local = sdata->local;
1192         struct ieee80211_supported_band *sband;
1193         struct sta_info *sta;
1194         u64 rates, basic_rates;
1195         u16 capab_info, status_code, aid;
1196         struct ieee802_11_elems elems;
1197         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1198         u8 *pos;
1199         u32 changed = 0;
1200         int i, j;
1201         bool have_higher_than_11mbit = false, newsta = false;
1202         u16 ap_ht_cap_flags;
1203
1204         /* AssocResp and ReassocResp have identical structure, so process both
1205          * of them in this function. */
1206
1207         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1208                 return;
1209
1210         if (len < 24 + 6)
1211                 return;
1212
1213         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1214                 return;
1215
1216         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1217         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1218         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1219
1220         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1221                "status=%d aid=%d)\n",
1222                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1223                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1224
1225         if (status_code != WLAN_STATUS_SUCCESS) {
1226                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1227                        sdata->dev->name, status_code);
1228                 /* if this was a reassociation, ensure we try a "full"
1229                  * association next time. This works around some broken APs
1230                  * which do not correctly reject reassociation requests. */
1231                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1232                 return;
1233         }
1234
1235         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1236                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1237                        "set\n", sdata->dev->name, aid);
1238         aid &= ~(BIT(15) | BIT(14));
1239
1240         pos = mgmt->u.assoc_resp.variable;
1241         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1242
1243         if (!elems.supp_rates) {
1244                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1245                        sdata->dev->name);
1246                 return;
1247         }
1248
1249         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1250         ifsta->aid = aid;
1251         ifsta->ap_capab = capab_info;
1252
1253         kfree(ifsta->assocresp_ies);
1254         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1255         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1256         if (ifsta->assocresp_ies)
1257                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1258
1259         rcu_read_lock();
1260
1261         /* Add STA entry for the AP */
1262         sta = sta_info_get(local, ifsta->bssid);
1263         if (!sta) {
1264                 struct ieee80211_bss *bss;
1265
1266                 newsta = true;
1267
1268                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1269                 if (!sta) {
1270                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1271                                " the AP\n", sdata->dev->name);
1272                         rcu_read_unlock();
1273                         return;
1274                 }
1275                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1276                                            local->hw.conf.channel->center_freq,
1277                                            ifsta->ssid, ifsta->ssid_len);
1278                 if (bss) {
1279                         sta->last_signal = bss->signal;
1280                         sta->last_qual = bss->qual;
1281                         sta->last_noise = bss->noise;
1282                         ieee80211_rx_bss_put(local, bss);
1283                 }
1284
1285                 /* update new sta with its last rx activity */
1286                 sta->last_rx = jiffies;
1287         }
1288
1289         /*
1290          * FIXME: Do we really need to update the sta_info's information here?
1291          *        We already know about the AP (we found it in our list) so it
1292          *        should already be filled with the right info, no?
1293          *        As is stands, all this is racy because typically we assume
1294          *        the information that is filled in here (except flags) doesn't
1295          *        change while a STA structure is alive. As such, it should move
1296          *        to between the sta_info_alloc() and sta_info_insert() above.
1297          */
1298
1299         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1300                            WLAN_STA_AUTHORIZED);
1301
1302         rates = 0;
1303         basic_rates = 0;
1304         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1305
1306         for (i = 0; i < elems.supp_rates_len; i++) {
1307                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1308                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1309
1310                 if (rate > 110)
1311                         have_higher_than_11mbit = true;
1312
1313                 for (j = 0; j < sband->n_bitrates; j++) {
1314                         if (sband->bitrates[j].bitrate == rate) {
1315                                 rates |= BIT(j);
1316                                 if (is_basic)
1317                                         basic_rates |= BIT(j);
1318                                 break;
1319                         }
1320                 }
1321         }
1322
1323         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1324                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1325                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1326
1327                 if (rate > 110)
1328                         have_higher_than_11mbit = true;
1329
1330                 for (j = 0; j < sband->n_bitrates; j++) {
1331                         if (sband->bitrates[j].bitrate == rate) {
1332                                 rates |= BIT(j);
1333                                 if (is_basic)
1334                                         basic_rates |= BIT(j);
1335                                 break;
1336                         }
1337                 }
1338         }
1339
1340         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1341         sdata->vif.bss_conf.basic_rates = basic_rates;
1342
1343         /* cf. IEEE 802.11 9.2.12 */
1344         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1345             have_higher_than_11mbit)
1346                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1347         else
1348                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1349
1350         if (elems.ht_cap_elem)
1351                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1352                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1353
1354         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1355
1356         rate_control_rate_init(sta);
1357
1358         if (elems.wmm_param)
1359                 set_sta_flags(sta, WLAN_STA_WME);
1360
1361         if (newsta) {
1362                 int err = sta_info_insert(sta);
1363                 if (err) {
1364                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1365                                " the AP (error %d)\n", sdata->dev->name, err);
1366                         rcu_read_unlock();
1367                         return;
1368                 }
1369         }
1370
1371         rcu_read_unlock();
1372
1373         if (elems.wmm_param)
1374                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1375                                          elems.wmm_param_len);
1376
1377         if (elems.ht_info_elem && elems.wmm_param &&
1378             (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1379                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1380                                                ap_ht_cap_flags);
1381
1382         /* set AID and assoc capability,
1383          * ieee80211_set_associated() will tell the driver */
1384         bss_conf->aid = aid;
1385         bss_conf->assoc_capability = capab_info;
1386         ieee80211_set_associated(sdata, ifsta, changed);
1387
1388         ieee80211_associated(sdata, ifsta);
1389 }
1390
1391
1392 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1393                                    struct ieee80211_if_sta *ifsta,
1394                                    struct ieee80211_bss *bss)
1395 {
1396         struct ieee80211_local *local = sdata->local;
1397         int res, rates, i, j;
1398         struct sk_buff *skb;
1399         struct ieee80211_mgmt *mgmt;
1400         u8 *pos;
1401         struct ieee80211_supported_band *sband;
1402         union iwreq_data wrqu;
1403
1404         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1405         if (!skb) {
1406                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1407                        "response\n", sdata->dev->name);
1408                 return -ENOMEM;
1409         }
1410
1411         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1412
1413         /* Remove possible STA entries from other IBSS networks. */
1414         sta_info_flush_delayed(sdata);
1415
1416         if (local->ops->reset_tsf) {
1417                 /* Reset own TSF to allow time synchronization work. */
1418                 local->ops->reset_tsf(local_to_hw(local));
1419         }
1420         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1421         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1422         if (res)
1423                 return res;
1424
1425         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1426
1427         sdata->drop_unencrypted = bss->capability &
1428                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1429
1430         res = ieee80211_set_freq(sdata, bss->freq);
1431
1432         if (res)
1433                 return res;
1434
1435         /* Build IBSS probe response */
1436
1437         skb_reserve(skb, local->hw.extra_tx_headroom);
1438
1439         mgmt = (struct ieee80211_mgmt *)
1440                 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1441         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1442         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1443                                                 IEEE80211_STYPE_PROBE_RESP);
1444         memset(mgmt->da, 0xff, ETH_ALEN);
1445         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1446         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1447         mgmt->u.beacon.beacon_int =
1448                 cpu_to_le16(local->hw.conf.beacon_int);
1449         mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1450         mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1451
1452         pos = skb_put(skb, 2 + ifsta->ssid_len);
1453         *pos++ = WLAN_EID_SSID;
1454         *pos++ = ifsta->ssid_len;
1455         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1456
1457         rates = bss->supp_rates_len;
1458         if (rates > 8)
1459                 rates = 8;
1460         pos = skb_put(skb, 2 + rates);
1461         *pos++ = WLAN_EID_SUPP_RATES;
1462         *pos++ = rates;
1463         memcpy(pos, bss->supp_rates, rates);
1464
1465         if (bss->band == IEEE80211_BAND_2GHZ) {
1466                 pos = skb_put(skb, 2 + 1);
1467                 *pos++ = WLAN_EID_DS_PARAMS;
1468                 *pos++ = 1;
1469                 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1470         }
1471
1472         pos = skb_put(skb, 2 + 2);
1473         *pos++ = WLAN_EID_IBSS_PARAMS;
1474         *pos++ = 2;
1475         /* FIX: set ATIM window based on scan results */
1476         *pos++ = 0;
1477         *pos++ = 0;
1478
1479         if (bss->supp_rates_len > 8) {
1480                 rates = bss->supp_rates_len - 8;
1481                 pos = skb_put(skb, 2 + rates);
1482                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1483                 *pos++ = rates;
1484                 memcpy(pos, &bss->supp_rates[8], rates);
1485         }
1486
1487         ifsta->probe_resp = skb;
1488
1489         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1490
1491
1492         rates = 0;
1493         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1494         for (i = 0; i < bss->supp_rates_len; i++) {
1495                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1496                 for (j = 0; j < sband->n_bitrates; j++)
1497                         if (sband->bitrates[j].bitrate == bitrate)
1498                                 rates |= BIT(j);
1499         }
1500         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1501
1502         ieee80211_sta_def_wmm_params(sdata, bss);
1503
1504         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1505         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1506
1507         ieee80211_led_assoc(local, true);
1508
1509         memset(&wrqu, 0, sizeof(wrqu));
1510         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1511         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1512
1513         return res;
1514 }
1515
1516 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1517                                   struct ieee80211_mgmt *mgmt,
1518                                   size_t len,
1519                                   struct ieee80211_rx_status *rx_status,
1520                                   struct ieee802_11_elems *elems,
1521                                   bool beacon)
1522 {
1523         struct ieee80211_local *local = sdata->local;
1524         int freq;
1525         struct ieee80211_bss *bss;
1526         struct sta_info *sta;
1527         struct ieee80211_channel *channel;
1528         u64 beacon_timestamp, rx_timestamp;
1529         u64 supp_rates = 0;
1530         enum ieee80211_band band = rx_status->band;
1531
1532         if (elems->ds_params && elems->ds_params_len == 1)
1533                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1534         else
1535                 freq = rx_status->freq;
1536
1537         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1538
1539         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1540                 return;
1541
1542         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1543             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1544                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1545
1546                 rcu_read_lock();
1547
1548                 sta = sta_info_get(local, mgmt->sa);
1549                 if (sta) {
1550                         u64 prev_rates;
1551
1552                         prev_rates = sta->sta.supp_rates[band];
1553                         /* make sure mandatory rates are always added */
1554                         sta->sta.supp_rates[band] = supp_rates |
1555                                 ieee80211_mandatory_rates(local, band);
1556
1557 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1558                         if (sta->sta.supp_rates[band] != prev_rates)
1559                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1560                                     "for %pM based on beacon info (0x%llx | "
1561                                     "0x%llx -> 0x%llx)\n",
1562                                     sdata->dev->name,
1563                                     sta->sta.addr,
1564                                     (unsigned long long) prev_rates,
1565                                     (unsigned long long) supp_rates,
1566                                     (unsigned long long) sta->sta.supp_rates[band]);
1567 #endif
1568                 } else {
1569                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1570                 }
1571
1572                 rcu_read_unlock();
1573         }
1574
1575         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1576                                         freq, beacon);
1577         if (!bss)
1578                 return;
1579
1580         /* was just updated in ieee80211_bss_info_update */
1581         beacon_timestamp = bss->timestamp;
1582
1583         /*
1584          * In STA mode, the remaining parameters should not be overridden
1585          * by beacons because they're not necessarily accurate there.
1586          */
1587         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1588             bss->last_probe_resp && beacon) {
1589                 ieee80211_rx_bss_put(local, bss);
1590                 return;
1591         }
1592
1593         /* check if we need to merge IBSS */
1594         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1595             bss->capability & WLAN_CAPABILITY_IBSS &&
1596             bss->freq == local->oper_channel->center_freq &&
1597             elems->ssid_len == sdata->u.sta.ssid_len &&
1598             memcmp(elems->ssid, sdata->u.sta.ssid,
1599                                 sdata->u.sta.ssid_len) == 0) {
1600                 if (rx_status->flag & RX_FLAG_TSFT) {
1601                         /* in order for correct IBSS merging we need mactime
1602                          *
1603                          * since mactime is defined as the time the first data
1604                          * symbol of the frame hits the PHY, and the timestamp
1605                          * of the beacon is defined as "the time that the data
1606                          * symbol containing the first bit of the timestamp is
1607                          * transmitted to the PHY plus the transmitting STA’s
1608                          * delays through its local PHY from the MAC-PHY
1609                          * interface to its interface with the WM"
1610                          * (802.11 11.1.2) - equals the time this bit arrives at
1611                          * the receiver - we have to take into account the
1612                          * offset between the two.
1613                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1614                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1615                          */
1616                         int rate;
1617                         if (rx_status->flag & RX_FLAG_HT) {
1618                                 rate = 65; /* TODO: HT rates */
1619                         } else {
1620                                 rate = local->hw.wiphy->bands[band]->
1621                                         bitrates[rx_status->rate_idx].bitrate;
1622                         }
1623                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1624                 } else if (local && local->ops && local->ops->get_tsf)
1625                         /* second best option: get current TSF */
1626                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1627                 else
1628                         /* can't merge without knowing the TSF */
1629                         rx_timestamp = -1LLU;
1630 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1631                 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1632                        "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1633                        mgmt->sa, mgmt->bssid,
1634                        (unsigned long long)rx_timestamp,
1635                        (unsigned long long)beacon_timestamp,
1636                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1637                        jiffies);
1638 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1639                 if (beacon_timestamp > rx_timestamp) {
1640 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1641                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1642                                "local TSF - IBSS merge with BSSID %pM\n",
1643                                sdata->dev->name, mgmt->bssid);
1644 #endif
1645                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1646                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1647                 }
1648         }
1649
1650         ieee80211_rx_bss_put(local, bss);
1651 }
1652
1653
1654 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1655                                          struct ieee80211_mgmt *mgmt,
1656                                          size_t len,
1657                                          struct ieee80211_rx_status *rx_status)
1658 {
1659         size_t baselen;
1660         struct ieee802_11_elems elems;
1661         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1662
1663         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1664                 return; /* ignore ProbeResp to foreign address */
1665
1666         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1667         if (baselen > len)
1668                 return;
1669
1670         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1671                                 &elems);
1672
1673         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1674
1675         /* direct probe may be part of the association flow */
1676         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1677                                                         &ifsta->request)) {
1678                 printk(KERN_DEBUG "%s direct probe responded\n",
1679                        sdata->dev->name);
1680                 ieee80211_authenticate(sdata, ifsta);
1681         }
1682 }
1683
1684
1685 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1686                                      struct ieee80211_mgmt *mgmt,
1687                                      size_t len,
1688                                      struct ieee80211_rx_status *rx_status)
1689 {
1690         struct ieee80211_if_sta *ifsta;
1691         size_t baselen;
1692         struct ieee802_11_elems elems;
1693         struct ieee80211_local *local = sdata->local;
1694         u32 changed = 0;
1695         bool erp_valid;
1696         u8 erp_value = 0;
1697
1698         /* Process beacon from the current BSS */
1699         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1700         if (baselen > len)
1701                 return;
1702
1703         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1704
1705         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1706
1707         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1708                 return;
1709         ifsta = &sdata->u.sta;
1710
1711         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1712             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1713                 return;
1714
1715         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1716                                  elems.wmm_param_len);
1717
1718
1719         if (elems.erp_info && elems.erp_info_len >= 1) {
1720                 erp_valid = true;
1721                 erp_value = elems.erp_info[0];
1722         } else {
1723                 erp_valid = false;
1724         }
1725         changed |= ieee80211_handle_bss_capability(sdata,
1726                         le16_to_cpu(mgmt->u.beacon.capab_info),
1727                         erp_valid, erp_value);
1728
1729
1730         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1731                 struct sta_info *sta;
1732                 struct ieee80211_supported_band *sband;
1733                 u16 ap_ht_cap_flags;
1734
1735                 rcu_read_lock();
1736
1737                 sta = sta_info_get(local, ifsta->bssid);
1738                 if (!sta) {
1739                         rcu_read_unlock();
1740                         return;
1741                 }
1742
1743                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1744
1745                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1746                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1747
1748                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1749
1750                 rcu_read_unlock();
1751
1752                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1753                                                ap_ht_cap_flags);
1754         }
1755
1756         if (elems.country_elem) {
1757                 /* Note we are only reviewing this on beacons
1758                  * for the BSSID we are associated to */
1759                 regulatory_hint_11d(local->hw.wiphy,
1760                         elems.country_elem, elems.country_elem_len);
1761         }
1762
1763         ieee80211_bss_info_change_notify(sdata, changed);
1764 }
1765
1766
1767 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1768                                         struct ieee80211_if_sta *ifsta,
1769                                         struct ieee80211_mgmt *mgmt,
1770                                         size_t len,
1771                                         struct ieee80211_rx_status *rx_status)
1772 {
1773         struct ieee80211_local *local = sdata->local;
1774         int tx_last_beacon;
1775         struct sk_buff *skb;
1776         struct ieee80211_mgmt *resp;
1777         u8 *pos, *end;
1778
1779         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1780             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1781             len < 24 + 2 || !ifsta->probe_resp)
1782                 return;
1783
1784         if (local->ops->tx_last_beacon)
1785                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1786         else
1787                 tx_last_beacon = 1;
1788
1789 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1790         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1791                " (tx_last_beacon=%d)\n",
1792                sdata->dev->name, mgmt->sa, mgmt->da,
1793                mgmt->bssid, tx_last_beacon);
1794 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1795
1796         if (!tx_last_beacon)
1797                 return;
1798
1799         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1800             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1801                 return;
1802
1803         end = ((u8 *) mgmt) + len;
1804         pos = mgmt->u.probe_req.variable;
1805         if (pos[0] != WLAN_EID_SSID ||
1806             pos + 2 + pos[1] > end) {
1807 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1808                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1809                        "from %pM\n",
1810                        sdata->dev->name, mgmt->sa);
1811 #endif
1812                 return;
1813         }
1814         if (pos[1] != 0 &&
1815             (pos[1] != ifsta->ssid_len ||
1816              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1817                 /* Ignore ProbeReq for foreign SSID */
1818                 return;
1819         }
1820
1821         /* Reply with ProbeResp */
1822         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1823         if (!skb)
1824                 return;
1825
1826         resp = (struct ieee80211_mgmt *) skb->data;
1827         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1828 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1829         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1830                sdata->dev->name, resp->da);
1831 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1832         ieee80211_tx_skb(sdata, skb, 0);
1833 }
1834
1835 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1836                            struct ieee80211_rx_status *rx_status)
1837 {
1838         struct ieee80211_local *local = sdata->local;
1839         struct ieee80211_if_sta *ifsta;
1840         struct ieee80211_mgmt *mgmt;
1841         u16 fc;
1842
1843         if (skb->len < 24)
1844                 goto fail;
1845
1846         ifsta = &sdata->u.sta;
1847
1848         mgmt = (struct ieee80211_mgmt *) skb->data;
1849         fc = le16_to_cpu(mgmt->frame_control);
1850
1851         switch (fc & IEEE80211_FCTL_STYPE) {
1852         case IEEE80211_STYPE_PROBE_REQ:
1853         case IEEE80211_STYPE_PROBE_RESP:
1854         case IEEE80211_STYPE_BEACON:
1855                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1856         case IEEE80211_STYPE_AUTH:
1857         case IEEE80211_STYPE_ASSOC_RESP:
1858         case IEEE80211_STYPE_REASSOC_RESP:
1859         case IEEE80211_STYPE_DEAUTH:
1860         case IEEE80211_STYPE_DISASSOC:
1861                 skb_queue_tail(&ifsta->skb_queue, skb);
1862                 queue_work(local->hw.workqueue, &ifsta->work);
1863                 return;
1864         }
1865
1866  fail:
1867         kfree_skb(skb);
1868 }
1869
1870 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1871                                          struct sk_buff *skb)
1872 {
1873         struct ieee80211_rx_status *rx_status;
1874         struct ieee80211_if_sta *ifsta;
1875         struct ieee80211_mgmt *mgmt;
1876         u16 fc;
1877
1878         ifsta = &sdata->u.sta;
1879
1880         rx_status = (struct ieee80211_rx_status *) skb->cb;
1881         mgmt = (struct ieee80211_mgmt *) skb->data;
1882         fc = le16_to_cpu(mgmt->frame_control);
1883
1884         switch (fc & IEEE80211_FCTL_STYPE) {
1885         case IEEE80211_STYPE_PROBE_REQ:
1886                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1887                                             rx_status);
1888                 break;
1889         case IEEE80211_STYPE_PROBE_RESP:
1890                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1891                 break;
1892         case IEEE80211_STYPE_BEACON:
1893                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1894                 break;
1895         case IEEE80211_STYPE_AUTH:
1896                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1897                 break;
1898         case IEEE80211_STYPE_ASSOC_RESP:
1899                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1900                 break;
1901         case IEEE80211_STYPE_REASSOC_RESP:
1902                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1903                 break;
1904         case IEEE80211_STYPE_DEAUTH:
1905                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1906                 break;
1907         case IEEE80211_STYPE_DISASSOC:
1908                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1909                 break;
1910         }
1911
1912         kfree_skb(skb);
1913 }
1914
1915
1916 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1917 {
1918         struct ieee80211_local *local = sdata->local;
1919         int active = 0;
1920         struct sta_info *sta;
1921
1922         rcu_read_lock();
1923
1924         list_for_each_entry_rcu(sta, &local->sta_list, list) {
1925                 if (sta->sdata == sdata &&
1926                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1927                                jiffies)) {
1928                         active++;
1929                         break;
1930                 }
1931         }
1932
1933         rcu_read_unlock();
1934
1935         return active;
1936 }
1937
1938
1939 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1940                                      struct ieee80211_if_sta *ifsta)
1941 {
1942         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1943
1944         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1945         if (ieee80211_sta_active_ibss(sdata))
1946                 return;
1947
1948         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1949                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1950         ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1951 }
1952
1953
1954 static void ieee80211_sta_timer(unsigned long data)
1955 {
1956         struct ieee80211_sub_if_data *sdata =
1957                 (struct ieee80211_sub_if_data *) data;
1958         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1959         struct ieee80211_local *local = sdata->local;
1960
1961         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1962         queue_work(local->hw.workqueue, &ifsta->work);
1963 }
1964
1965 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1966                                      struct ieee80211_if_sta *ifsta)
1967 {
1968         struct ieee80211_local *local = sdata->local;
1969
1970         if (local->ops->reset_tsf) {
1971                 /* Reset own TSF to allow time synchronization work. */
1972                 local->ops->reset_tsf(local_to_hw(local));
1973         }
1974
1975         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1976
1977
1978         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1979                 ifsta->auth_alg = WLAN_AUTH_OPEN;
1980         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1981                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1982         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1983                 ifsta->auth_alg = WLAN_AUTH_LEAP;
1984         else
1985                 ifsta->auth_alg = WLAN_AUTH_OPEN;
1986         ifsta->auth_transaction = -1;
1987         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1988         ifsta->assoc_scan_tries = 0;
1989         ifsta->direct_probe_tries = 0;
1990         ifsta->auth_tries = 0;
1991         ifsta->assoc_tries = 0;
1992         netif_tx_stop_all_queues(sdata->dev);
1993         netif_carrier_off(sdata->dev);
1994 }
1995
1996
1997 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
1998                                     const char *ssid, int ssid_len)
1999 {
2000         int tmp, hidden_ssid;
2001
2002         if (ssid_len == ifsta->ssid_len &&
2003             !memcmp(ifsta->ssid, ssid, ssid_len))
2004                 return 1;
2005
2006         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2007                 return 0;
2008
2009         hidden_ssid = 1;
2010         tmp = ssid_len;
2011         while (tmp--) {
2012                 if (ssid[tmp] != '\0') {
2013                         hidden_ssid = 0;
2014                         break;
2015                 }
2016         }
2017
2018         if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2019                 return 1;
2020
2021         if (ssid_len == 1 && ssid[0] == ' ')
2022                 return 1;
2023
2024         return 0;
2025 }
2026
2027 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2028                                      struct ieee80211_if_sta *ifsta)
2029 {
2030         struct ieee80211_local *local = sdata->local;
2031         struct ieee80211_bss *bss;
2032         struct ieee80211_supported_band *sband;
2033         u8 bssid[ETH_ALEN], *pos;
2034         int i;
2035         int ret;
2036
2037 #if 0
2038         /* Easier testing, use fixed BSSID. */
2039         memset(bssid, 0xfe, ETH_ALEN);
2040 #else
2041         /* Generate random, not broadcast, locally administered BSSID. Mix in
2042          * own MAC address to make sure that devices that do not have proper
2043          * random number generator get different BSSID. */
2044         get_random_bytes(bssid, ETH_ALEN);
2045         for (i = 0; i < ETH_ALEN; i++)
2046                 bssid[i] ^= sdata->dev->dev_addr[i];
2047         bssid[0] &= ~0x01;
2048         bssid[0] |= 0x02;
2049 #endif
2050
2051         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2052                sdata->dev->name, bssid);
2053
2054         bss = ieee80211_rx_bss_add(local, bssid,
2055                                    local->hw.conf.channel->center_freq,
2056                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2057         if (!bss)
2058                 return -ENOMEM;
2059
2060         bss->band = local->hw.conf.channel->band;
2061         sband = local->hw.wiphy->bands[bss->band];
2062
2063         if (local->hw.conf.beacon_int == 0)
2064                 local->hw.conf.beacon_int = 100;
2065         bss->beacon_int = local->hw.conf.beacon_int;
2066         bss->last_update = jiffies;
2067         bss->capability = WLAN_CAPABILITY_IBSS;
2068
2069         if (sdata->default_key)
2070                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2071         else
2072                 sdata->drop_unencrypted = 0;
2073
2074         bss->supp_rates_len = sband->n_bitrates;
2075         pos = bss->supp_rates;
2076         for (i = 0; i < sband->n_bitrates; i++) {
2077                 int rate = sband->bitrates[i].bitrate;
2078                 *pos++ = (u8) (rate / 5);
2079         }
2080
2081         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2082         ieee80211_rx_bss_put(local, bss);
2083         return ret;
2084 }
2085
2086
2087 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2088                                    struct ieee80211_if_sta *ifsta)
2089 {
2090         struct ieee80211_local *local = sdata->local;
2091         struct ieee80211_bss *bss;
2092         int found = 0;
2093         u8 bssid[ETH_ALEN];
2094         int active_ibss;
2095
2096         if (ifsta->ssid_len == 0)
2097                 return -EINVAL;
2098
2099         active_ibss = ieee80211_sta_active_ibss(sdata);
2100 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2101         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2102                sdata->dev->name, active_ibss);
2103 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2104         spin_lock_bh(&local->bss_lock);
2105         list_for_each_entry(bss, &local->bss_list, list) {
2106                 if (ifsta->ssid_len != bss->ssid_len ||
2107                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2108                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2109                         continue;
2110 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2111                 printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
2112 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2113                 memcpy(bssid, bss->bssid, ETH_ALEN);
2114                 found = 1;
2115                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2116                         break;
2117         }
2118         spin_unlock_bh(&local->bss_lock);
2119
2120 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2121         if (found)
2122                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2123                        "%pM\n", bssid, ifsta->bssid);
2124 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2125
2126         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2127                 int ret;
2128                 int search_freq;
2129
2130                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2131                         search_freq = bss->freq;
2132                 else
2133                         search_freq = local->hw.conf.channel->center_freq;
2134
2135                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2136                                            ifsta->ssid, ifsta->ssid_len);
2137                 if (!bss)
2138                         goto dont_join;
2139
2140                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2141                        " based on configured SSID\n",
2142                        sdata->dev->name, bssid);
2143                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2144                 ieee80211_rx_bss_put(local, bss);
2145                 return ret;
2146         }
2147
2148 dont_join:
2149 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2150         printk(KERN_DEBUG "   did not try to join ibss\n");
2151 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2152
2153         /* Selected IBSS not found in current scan results - try to scan */
2154         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2155             !ieee80211_sta_active_ibss(sdata)) {
2156                 mod_timer(&ifsta->timer, jiffies +
2157                                       IEEE80211_IBSS_MERGE_INTERVAL);
2158         } else if (time_after(jiffies, local->last_scan_completed +
2159                               IEEE80211_SCAN_INTERVAL)) {
2160                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2161                        "join\n", sdata->dev->name);
2162                 return ieee80211_request_scan(sdata, ifsta->ssid,
2163                                               ifsta->ssid_len);
2164         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2165                 int interval = IEEE80211_SCAN_INTERVAL;
2166
2167                 if (time_after(jiffies, ifsta->ibss_join_req +
2168                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2169                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2170                             (!(local->oper_channel->flags &
2171                                         IEEE80211_CHAN_NO_IBSS)))
2172                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2173                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2174                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2175                                        " %d MHz\n", sdata->dev->name,
2176                                        local->hw.conf.channel->center_freq);
2177                         }
2178
2179                         /* No IBSS found - decrease scan interval and continue
2180                          * scanning. */
2181                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2182                 }
2183
2184                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2185                 mod_timer(&ifsta->timer, jiffies + interval);
2186                 return 0;
2187         }
2188
2189         return 0;
2190 }
2191
2192
2193 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2194                                      struct ieee80211_if_sta *ifsta)
2195 {
2196         struct ieee80211_local *local = sdata->local;
2197         struct ieee80211_bss *bss, *selected = NULL;
2198         int top_rssi = 0, freq;
2199
2200         spin_lock_bh(&local->bss_lock);
2201         freq = local->oper_channel->center_freq;
2202         list_for_each_entry(bss, &local->bss_list, list) {
2203                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2204                         continue;
2205
2206                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2207                         IEEE80211_STA_AUTO_BSSID_SEL |
2208                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2209                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2210                      !!sdata->default_key))
2211                         continue;
2212
2213                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2214                     bss->freq != freq)
2215                         continue;
2216
2217                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2218                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2219                         continue;
2220
2221                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2222                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2223                         continue;
2224
2225                 if (!selected || top_rssi < bss->signal) {
2226                         selected = bss;
2227                         top_rssi = bss->signal;
2228                 }
2229         }
2230         if (selected)
2231                 atomic_inc(&selected->users);
2232         spin_unlock_bh(&local->bss_lock);
2233
2234         if (selected) {
2235                 ieee80211_set_freq(sdata, selected->freq);
2236                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2237                         ieee80211_sta_set_ssid(sdata, selected->ssid,
2238                                                selected->ssid_len);
2239                 ieee80211_sta_set_bssid(sdata, selected->bssid);
2240                 ieee80211_sta_def_wmm_params(sdata, selected);
2241
2242                 /* Send out direct probe if no probe resp was received or
2243                  * the one we have is outdated
2244                  */
2245                 if (!selected->last_probe_resp ||
2246                     time_after(jiffies, selected->last_probe_resp
2247                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2248                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2249                 else
2250                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2251
2252                 ieee80211_rx_bss_put(local, selected);
2253                 ieee80211_sta_reset_auth(sdata, ifsta);
2254                 return 0;
2255         } else {
2256                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2257                         ifsta->assoc_scan_tries++;
2258                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2259                                 ieee80211_start_scan(sdata, NULL, 0);
2260                         else
2261                                 ieee80211_start_scan(sdata, ifsta->ssid,
2262                                                          ifsta->ssid_len);
2263                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2264                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2265                 } else
2266                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2267         }
2268         return -1;
2269 }
2270
2271
2272 static void ieee80211_sta_work(struct work_struct *work)
2273 {
2274         struct ieee80211_sub_if_data *sdata =
2275                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2276         struct ieee80211_local *local = sdata->local;
2277         struct ieee80211_if_sta *ifsta;
2278         struct sk_buff *skb;
2279
2280         if (!netif_running(sdata->dev))
2281                 return;
2282
2283         if (local->sw_scanning || local->hw_scanning)
2284                 return;
2285
2286         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2287                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2288                 return;
2289         ifsta = &sdata->u.sta;
2290
2291         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2292                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2293
2294         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2295             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2296             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2297             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2298                 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2299                                      ifsta->scan_ssid_len);
2300                 return;
2301         }
2302
2303         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2304                 if (ieee80211_sta_config_auth(sdata, ifsta))
2305                         return;
2306                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2307         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2308                 return;
2309
2310         switch (ifsta->state) {
2311         case IEEE80211_STA_MLME_DISABLED:
2312                 break;
2313         case IEEE80211_STA_MLME_DIRECT_PROBE:
2314                 ieee80211_direct_probe(sdata, ifsta);
2315                 break;
2316         case IEEE80211_STA_MLME_AUTHENTICATE:
2317                 ieee80211_authenticate(sdata, ifsta);
2318                 break;
2319         case IEEE80211_STA_MLME_ASSOCIATE:
2320                 ieee80211_associate(sdata, ifsta);
2321                 break;
2322         case IEEE80211_STA_MLME_ASSOCIATED:
2323                 ieee80211_associated(sdata, ifsta);
2324                 break;
2325         case IEEE80211_STA_MLME_IBSS_SEARCH:
2326                 ieee80211_sta_find_ibss(sdata, ifsta);
2327                 break;
2328         case IEEE80211_STA_MLME_IBSS_JOINED:
2329                 ieee80211_sta_merge_ibss(sdata, ifsta);
2330                 break;
2331         default:
2332                 WARN_ON(1);
2333                 break;
2334         }
2335
2336         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2337                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2338                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2339
2340                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2341                                         WLAN_REASON_UNSPECIFIED);
2342         }
2343 }
2344
2345 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2346 {
2347         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2348                 queue_work(sdata->local->hw.workqueue,
2349                            &sdata->u.sta.work);
2350 }
2351
2352 /* interface setup */
2353 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2354 {
2355         struct ieee80211_if_sta *ifsta;
2356
2357         ifsta = &sdata->u.sta;
2358         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2359         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2360                     (unsigned long) sdata);
2361         skb_queue_head_init(&ifsta->skb_queue);
2362
2363         ifsta->capab = WLAN_CAPABILITY_ESS;
2364         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2365                 IEEE80211_AUTH_ALG_SHARED_KEY;
2366         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2367                 IEEE80211_STA_AUTO_BSSID_SEL |
2368                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2369         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2370                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2371 }
2372
2373 /*
2374  * Add a new IBSS station, will also be called by the RX code when,
2375  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2376  * must be callable in atomic context.
2377  */
2378 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2379                                         u8 *bssid,u8 *addr, u64 supp_rates)
2380 {
2381         struct ieee80211_local *local = sdata->local;
2382         struct sta_info *sta;
2383         int band = local->hw.conf.channel->band;
2384
2385         /* TODO: Could consider removing the least recently used entry and
2386          * allow new one to be added. */
2387         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2388                 if (net_ratelimit()) {
2389                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2390                                "entry %pM\n", sdata->dev->name, addr);
2391                 }
2392                 return NULL;
2393         }
2394
2395         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2396                 return NULL;
2397
2398 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2399         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2400                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2401 #endif
2402
2403         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2404         if (!sta)
2405                 return NULL;
2406
2407         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2408
2409         /* make sure mandatory rates are always added */
2410         sta->sta.supp_rates[band] = supp_rates |
2411                         ieee80211_mandatory_rates(local, band);
2412
2413         rate_control_rate_init(sta);
2414
2415         if (sta_info_insert(sta))
2416                 return NULL;
2417
2418         return sta;
2419 }
2420
2421 /* configuration hooks */
2422 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2423                             struct ieee80211_if_sta *ifsta)
2424 {
2425         struct ieee80211_local *local = sdata->local;
2426
2427         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2428                 return;
2429
2430         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2431                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2432             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2433                              IEEE80211_STA_AUTO_SSID_SEL))) {
2434
2435                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2436                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2437                                                WLAN_REASON_DEAUTH_LEAVING);
2438
2439                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2440                 queue_work(local->hw.workqueue, &ifsta->work);
2441         }
2442 }
2443
2444 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2445 {
2446         struct ieee80211_if_sta *ifsta;
2447
2448         if (len > IEEE80211_MAX_SSID_LEN)
2449                 return -EINVAL;
2450
2451         ifsta = &sdata->u.sta;
2452
2453         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2454                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2455                 memcpy(ifsta->ssid, ssid, len);
2456                 ifsta->ssid_len = len;
2457                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2458         }
2459
2460         if (len)
2461                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2462         else
2463                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2464
2465         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2466             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2467                 ifsta->ibss_join_req = jiffies;
2468                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2469                 return ieee80211_sta_find_ibss(sdata, ifsta);
2470         }
2471
2472         return 0;
2473 }
2474
2475 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2476 {
2477         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2478         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2479         *len = ifsta->ssid_len;
2480         return 0;
2481 }
2482
2483 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2484 {
2485         struct ieee80211_if_sta *ifsta;
2486         int res;
2487
2488         ifsta = &sdata->u.sta;
2489
2490         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2491                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2492                 res = 0;
2493                 /*
2494                  * Hack! See also ieee80211_sta_set_ssid.
2495                  */
2496                 if (netif_running(sdata->dev))
2497                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2498                 if (res) {
2499                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2500                                "the low-level driver\n", sdata->dev->name);
2501                         return res;
2502                 }
2503         }
2504
2505         if (is_valid_ether_addr(bssid))
2506                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2507         else
2508                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2509
2510         return 0;
2511 }
2512
2513 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2514 {
2515         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2516
2517         kfree(ifsta->extra_ie);
2518         if (len == 0) {
2519                 ifsta->extra_ie = NULL;
2520                 ifsta->extra_ie_len = 0;
2521                 return 0;
2522         }
2523         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2524         if (!ifsta->extra_ie) {
2525                 ifsta->extra_ie_len = 0;
2526                 return -ENOMEM;
2527         }
2528         memcpy(ifsta->extra_ie, ie, len);
2529         ifsta->extra_ie_len = len;
2530         return 0;
2531 }
2532
2533 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2534 {
2535         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2536
2537         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2538                sdata->dev->name, reason);
2539
2540         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2541             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2542                 return -EINVAL;
2543
2544         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2545         return 0;
2546 }
2547
2548 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2549 {
2550         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2551
2552         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2553                sdata->dev->name, reason);
2554
2555         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2556                 return -EINVAL;
2557
2558         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2559                 return -1;
2560
2561         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2562         return 0;
2563 }
2564
2565 /* scan finished notification */
2566 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2567 {
2568         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2569         struct ieee80211_if_sta *ifsta;
2570
2571         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2572                 ifsta = &sdata->u.sta;
2573                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2574                     (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2575                     !ieee80211_sta_active_ibss(sdata)))
2576                         ieee80211_sta_find_ibss(sdata, ifsta);
2577         }
2578
2579         /* Restart STA timers */
2580         rcu_read_lock();
2581         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2582                 ieee80211_restart_sta_timer(sdata);
2583         rcu_read_unlock();
2584 }