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         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_HT);
 862
 863         ieee80211_bss_info_change_notify(sdata, changed);
 864
 865         rcu_read_lock();
 866
 867         sta = sta_info_get(local, ifsta->bssid);
 868         if (!sta) {
 869                 rcu_read_unlock();
 870                 return;
 871         }
 872
 873         sta_info_unlink(&sta);
 874
 875         rcu_read_unlock();
 876
 877         sta_info_destroy(sta);
 878 }
 879
 880 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 881 {
 882         if (!sdata || !sdata->default_key ||
 883             sdata->default_key->conf.alg != ALG_WEP)
 884                 return 0;
 885         return 1;
 886 }
 887
 888 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
 889                                       struct ieee80211_if_sta *ifsta)
 890 {
 891         struct ieee80211_local *local = sdata->local;
 892         struct ieee80211_bss *bss;
 893         int bss_privacy;
 894         int wep_privacy;
 895         int privacy_invoked;
 896
 897         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
 898                 return 0;
 899
 900         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 901                                    local->hw.conf.channel->center_freq,
 902                                    ifsta->ssid, ifsta->ssid_len);
 903         if (!bss)
 904                 return 0;
 905
 906         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
 907         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
 908         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
 909
 910         ieee80211_rx_bss_put(local, bss);
 911
 912         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 913                 return 0;
 914
 915         return 1;
 916 }
 917
 918 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
 919                                 struct ieee80211_if_sta *ifsta)
 920 {
 921         ifsta->assoc_tries++;
 922         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 923                 printk(KERN_DEBUG "%s: association with AP %pM"
 924                        " timed out\n",
 925                        sdata->dev->name, ifsta->bssid);
 926                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 927                 ieee80211_sta_send_apinfo(sdata, ifsta);
 928                 return;
 929         }
 930
 931         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
 932         printk(KERN_DEBUG "%s: associate with AP %pM\n",
 933                sdata->dev->name, ifsta->bssid);
 934         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
 935                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 936                        "mixed-cell disabled - abort association\n", sdata->dev->name);
 937                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 938                 return;
 939         }
 940
 941         ieee80211_send_assoc(sdata, ifsta);
 942
 943         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 944 }
 945
 946
 947 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
 948                                  struct ieee80211_if_sta *ifsta)
 949 {
 950         struct ieee80211_local *local = sdata->local;
 951         struct sta_info *sta;
 952         int disassoc;
 953
 954         /* TODO: start monitoring current AP signal quality and number of
 955          * missed beacons. Scan other channels every now and then and search
 956          * for better APs. */
 957         /* TODO: remove expired BSSes */
 958
 959         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
 960
 961         rcu_read_lock();
 962
 963         sta = sta_info_get(local, ifsta->bssid);
 964         if (!sta) {
 965                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
 966                        sdata->dev->name, ifsta->bssid);
 967                 disassoc = 1;
 968         } else {
 969                 disassoc = 0;
 970                 if (time_after(jiffies,
 971                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 972                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
 973                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 974                                        "current AP %pM - assume out of "
 975                                        "range\n",
 976                                        sdata->dev->name, ifsta->bssid);
 977                                 disassoc = 1;
 978                         } else
 979                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
 980                                                          ifsta->ssid,
 981                                                          ifsta->ssid_len);
 982                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 983                 } else {
 984                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 985                         if (time_after(jiffies, ifsta->last_probe +
 986                                        IEEE80211_PROBE_INTERVAL)) {
 987                                 ifsta->last_probe = jiffies;
 988                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
 989                                                          ifsta->ssid,
 990                                                          ifsta->ssid_len);
 991                         }
 992                 }
 993         }
 994
 995         rcu_read_unlock();
 996
 997         if (disassoc)
 998                 ieee80211_set_disassoc(sdata, ifsta, true, true,
 999                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1000         else
1001                 mod_timer(&ifsta->timer, jiffies +
1002                                       IEEE80211_MONITORING_INTERVAL);
1003 }
1004
1005
1006 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1007                                      struct ieee80211_if_sta *ifsta)
1008 {
1009         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1010         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1011         ieee80211_associate(sdata, ifsta);
1012 }
1013
1014
1015 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1016                                      struct ieee80211_if_sta *ifsta,
1017                                      struct ieee80211_mgmt *mgmt,
1018                                      size_t len)
1019 {
1020         u8 *pos;
1021         struct ieee802_11_elems elems;
1022
1023         pos = mgmt->u.auth.variable;
1024         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1025         if (!elems.challenge)
1026                 return;
1027         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1028                             elems.challenge_len + 2, 1);
1029 }
1030
1031 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1032                                    struct ieee80211_if_sta *ifsta,
1033                                    struct ieee80211_mgmt *mgmt,
1034                                    size_t len)
1035 {
1036         u16 auth_alg, auth_transaction, status_code;
1037
1038         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1039             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1040                 return;
1041
1042         if (len < 24 + 6)
1043                 return;
1044
1045         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1046             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1047                 return;
1048
1049         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1050             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1051                 return;
1052
1053         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1054         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1055         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1056
1057         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1058                 /*
1059                  * IEEE 802.11 standard does not require authentication in IBSS
1060                  * networks and most implementations do not seem to use it.
1061                  * However, try to reply to authentication attempts if someone
1062                  * has actually implemented this.
1063                  */
1064                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1065                         return;
1066                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1067         }
1068
1069         if (auth_alg != ifsta->auth_alg ||
1070             auth_transaction != ifsta->auth_transaction)
1071                 return;
1072
1073         if (status_code != WLAN_STATUS_SUCCESS) {
1074                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1075                         u8 algs[3];
1076                         const int num_algs = ARRAY_SIZE(algs);
1077                         int i, pos;
1078                         algs[0] = algs[1] = algs[2] = 0xff;
1079                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1080                                 algs[0] = WLAN_AUTH_OPEN;
1081                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1082                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1083                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1084                                 algs[2] = WLAN_AUTH_LEAP;
1085                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1086                                 pos = 0;
1087                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1088                                 pos = 1;
1089                         else
1090                                 pos = 2;
1091                         for (i = 0; i < num_algs; i++) {
1092                                 pos++;
1093                                 if (pos >= num_algs)
1094                                         pos = 0;
1095                                 if (algs[pos] == ifsta->auth_alg ||
1096                                     algs[pos] == 0xff)
1097                                         continue;
1098                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1099                                     !ieee80211_sta_wep_configured(sdata))
1100                                         continue;
1101                                 ifsta->auth_alg = algs[pos];
1102                                 break;
1103                         }
1104                 }
1105                 return;
1106         }
1107
1108         switch (ifsta->auth_alg) {
1109         case WLAN_AUTH_OPEN:
1110         case WLAN_AUTH_LEAP:
1111                 ieee80211_auth_completed(sdata, ifsta);
1112                 break;
1113         case WLAN_AUTH_SHARED_KEY:
1114                 if (ifsta->auth_transaction == 4)
1115                         ieee80211_auth_completed(sdata, ifsta);
1116                 else
1117                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1118                 break;
1119         }
1120 }
1121
1122
1123 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1124                                      struct ieee80211_if_sta *ifsta,
1125                                      struct ieee80211_mgmt *mgmt,
1126                                      size_t len)
1127 {
1128         u16 reason_code;
1129
1130         if (len < 24 + 2)
1131                 return;
1132
1133         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1134                 return;
1135
1136         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1137
1138         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1139                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1140                                 sdata->dev->name, reason_code);
1141
1142         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1143             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1144             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1145                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1146                 mod_timer(&ifsta->timer, jiffies +
1147                                       IEEE80211_RETRY_AUTH_INTERVAL);
1148         }
1149
1150         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1151         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1152 }
1153
1154
1155 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1156                                        struct ieee80211_if_sta *ifsta,
1157                                        struct ieee80211_mgmt *mgmt,
1158                                        size_t len)
1159 {
1160         u16 reason_code;
1161
1162         if (len < 24 + 2)
1163                 return;
1164
1165         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1166                 return;
1167
1168         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1169
1170         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1171                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1172                                 sdata->dev->name, reason_code);
1173
1174         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1175                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1176                 mod_timer(&ifsta->timer, jiffies +
1177                                       IEEE80211_RETRY_AUTH_INTERVAL);
1178         }
1179
1180         ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1181 }
1182
1183
1184 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1185                                          struct ieee80211_if_sta *ifsta,
1186                                          struct ieee80211_mgmt *mgmt,
1187                                          size_t len,
1188                                          int reassoc)
1189 {
1190         struct ieee80211_local *local = sdata->local;
1191         struct ieee80211_supported_band *sband;
1192         struct sta_info *sta;
1193         u64 rates, basic_rates;
1194         u16 capab_info, status_code, aid;
1195         struct ieee802_11_elems elems;
1196         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1197         u8 *pos;
1198         u32 changed = 0;
1199         int i, j;
1200         bool have_higher_than_11mbit = false, newsta = false;
1201         u16 ap_ht_cap_flags;
1202
1203         /* AssocResp and ReassocResp have identical structure, so process both
1204          * of them in this function. */
1205
1206         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1207                 return;
1208
1209         if (len < 24 + 6)
1210                 return;
1211
1212         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1213                 return;
1214
1215         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1216         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1217         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1218
1219         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1220                "status=%d aid=%d)\n",
1221                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1222                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1223
1224         if (status_code != WLAN_STATUS_SUCCESS) {
1225                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1226                        sdata->dev->name, status_code);
1227                 /* if this was a reassociation, ensure we try a "full"
1228                  * association next time. This works around some broken APs
1229                  * which do not correctly reject reassociation requests. */
1230                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1231                 return;
1232         }
1233
1234         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1235                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1236                        "set\n", sdata->dev->name, aid);
1237         aid &= ~(BIT(15) | BIT(14));
1238
1239         pos = mgmt->u.assoc_resp.variable;
1240         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1241
1242         if (!elems.supp_rates) {
1243                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1244                        sdata->dev->name);
1245                 return;
1246         }
1247
1248         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1249         ifsta->aid = aid;
1250         ifsta->ap_capab = capab_info;
1251
1252         kfree(ifsta->assocresp_ies);
1253         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1254         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1255         if (ifsta->assocresp_ies)
1256                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1257
1258         rcu_read_lock();
1259
1260         /* Add STA entry for the AP */
1261         sta = sta_info_get(local, ifsta->bssid);
1262         if (!sta) {
1263                 struct ieee80211_bss *bss;
1264
1265                 newsta = true;
1266
1267                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1268                 if (!sta) {
1269                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1270                                " the AP\n", sdata->dev->name);
1271                         rcu_read_unlock();
1272                         return;
1273                 }
1274                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1275                                            local->hw.conf.channel->center_freq,
1276                                            ifsta->ssid, ifsta->ssid_len);
1277                 if (bss) {
1278                         sta->last_signal = bss->signal;
1279                         sta->last_qual = bss->qual;
1280                         sta->last_noise = bss->noise;
1281                         ieee80211_rx_bss_put(local, bss);
1282                 }
1283
1284                 /* update new sta with its last rx activity */
1285                 sta->last_rx = jiffies;
1286         }
1287
1288         /*
1289          * FIXME: Do we really need to update the sta_info's information here?
1290          *        We already know about the AP (we found it in our list) so it
1291          *        should already be filled with the right info, no?
1292          *        As is stands, all this is racy because typically we assume
1293          *        the information that is filled in here (except flags) doesn't
1294          *        change while a STA structure is alive. As such, it should move
1295          *        to between the sta_info_alloc() and sta_info_insert() above.
1296          */
1297
1298         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1299                            WLAN_STA_AUTHORIZED);
1300
1301         rates = 0;
1302         basic_rates = 0;
1303         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1304
1305         for (i = 0; i < elems.supp_rates_len; i++) {
1306                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1307                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1308
1309                 if (rate > 110)
1310                         have_higher_than_11mbit = true;
1311
1312                 for (j = 0; j < sband->n_bitrates; j++) {
1313                         if (sband->bitrates[j].bitrate == rate) {
1314                                 rates |= BIT(j);
1315                                 if (is_basic)
1316                                         basic_rates |= BIT(j);
1317                                 break;
1318                         }
1319                 }
1320         }
1321
1322         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1323                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1324                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1325
1326                 if (rate > 110)
1327                         have_higher_than_11mbit = true;
1328
1329                 for (j = 0; j < sband->n_bitrates; j++) {
1330                         if (sband->bitrates[j].bitrate == rate) {
1331                                 rates |= BIT(j);
1332                                 if (is_basic)
1333                                         basic_rates |= BIT(j);
1334                                 break;
1335                         }
1336                 }
1337         }
1338
1339         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1340         sdata->vif.bss_conf.basic_rates = basic_rates;
1341
1342         /* cf. IEEE 802.11 9.2.12 */
1343         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1344             have_higher_than_11mbit)
1345                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1346         else
1347                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1348
1349         if (elems.ht_cap_elem)
1350                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1351                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1352
1353         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1354
1355         rate_control_rate_init(sta);
1356
1357         if (elems.wmm_param)
1358                 set_sta_flags(sta, WLAN_STA_WME);
1359
1360         if (newsta) {
1361                 int err = sta_info_insert(sta);
1362                 if (err) {
1363                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1364                                " the AP (error %d)\n", sdata->dev->name, err);
1365                         rcu_read_unlock();
1366                         return;
1367                 }
1368         }
1369
1370         rcu_read_unlock();
1371
1372         if (elems.wmm_param)
1373                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1374                                          elems.wmm_param_len);
1375
1376         if (elems.ht_info_elem && elems.wmm_param &&
1377             (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1378                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1379                                                ap_ht_cap_flags);
1380
1381         /* set AID and assoc capability,
1382          * ieee80211_set_associated() will tell the driver */
1383         bss_conf->aid = aid;
1384         bss_conf->assoc_capability = capab_info;
1385         ieee80211_set_associated(sdata, ifsta, changed);
1386
1387         ieee80211_associated(sdata, ifsta);
1388 }
1389
1390
1391 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1392                                    struct ieee80211_if_sta *ifsta,
1393                                    struct ieee80211_bss *bss)
1394 {
1395         struct ieee80211_local *local = sdata->local;
1396         int res, rates, i, j;
1397         struct sk_buff *skb;
1398         struct ieee80211_mgmt *mgmt;
1399         u8 *pos;
1400         struct ieee80211_supported_band *sband;
1401         union iwreq_data wrqu;
1402
1403         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1404         if (!skb) {
1405                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1406                        "response\n", sdata->dev->name);
1407                 return -ENOMEM;
1408         }
1409
1410         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1411
1412         /* Remove possible STA entries from other IBSS networks. */
1413         sta_info_flush_delayed(sdata);
1414
1415         if (local->ops->reset_tsf) {
1416                 /* Reset own TSF to allow time synchronization work. */
1417                 local->ops->reset_tsf(local_to_hw(local));
1418         }
1419         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1420         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1421         if (res)
1422                 return res;
1423
1424         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1425
1426         sdata->drop_unencrypted = bss->capability &
1427                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1428
1429         res = ieee80211_set_freq(sdata, bss->freq);
1430
1431         if (res)
1432                 return res;
1433
1434         /* Build IBSS probe response */
1435
1436         skb_reserve(skb, local->hw.extra_tx_headroom);
1437
1438         mgmt = (struct ieee80211_mgmt *)
1439                 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1440         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1441         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1442                                                 IEEE80211_STYPE_PROBE_RESP);
1443         memset(mgmt->da, 0xff, ETH_ALEN);
1444         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1445         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1446         mgmt->u.beacon.beacon_int =
1447                 cpu_to_le16(local->hw.conf.beacon_int);
1448         mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1449         mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1450
1451         pos = skb_put(skb, 2 + ifsta->ssid_len);
1452         *pos++ = WLAN_EID_SSID;
1453         *pos++ = ifsta->ssid_len;
1454         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1455
1456         rates = bss->supp_rates_len;
1457         if (rates > 8)
1458                 rates = 8;
1459         pos = skb_put(skb, 2 + rates);
1460         *pos++ = WLAN_EID_SUPP_RATES;
1461         *pos++ = rates;
1462         memcpy(pos, bss->supp_rates, rates);
1463
1464         if (bss->band == IEEE80211_BAND_2GHZ) {
1465                 pos = skb_put(skb, 2 + 1);
1466                 *pos++ = WLAN_EID_DS_PARAMS;
1467                 *pos++ = 1;
1468                 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1469         }
1470
1471         pos = skb_put(skb, 2 + 2);
1472         *pos++ = WLAN_EID_IBSS_PARAMS;
1473         *pos++ = 2;
1474         /* FIX: set ATIM window based on scan results */
1475         *pos++ = 0;
1476         *pos++ = 0;
1477
1478         if (bss->supp_rates_len > 8) {
1479                 rates = bss->supp_rates_len - 8;
1480                 pos = skb_put(skb, 2 + rates);
1481                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1482                 *pos++ = rates;
1483                 memcpy(pos, &bss->supp_rates[8], rates);
1484         }
1485
1486         ifsta->probe_resp = skb;
1487
1488         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1489
1490
1491         rates = 0;
1492         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1493         for (i = 0; i < bss->supp_rates_len; i++) {
1494                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1495                 for (j = 0; j < sband->n_bitrates; j++)
1496                         if (sband->bitrates[j].bitrate == bitrate)
1497                                 rates |= BIT(j);
1498         }
1499         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1500
1501         ieee80211_sta_def_wmm_params(sdata, bss);
1502
1503         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1504         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1505
1506         ieee80211_led_assoc(local, true);
1507
1508         memset(&wrqu, 0, sizeof(wrqu));
1509         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1510         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1511
1512         return res;
1513 }
1514
1515 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1516                                   struct ieee80211_mgmt *mgmt,
1517                                   size_t len,
1518                                   struct ieee80211_rx_status *rx_status,
1519                                   struct ieee802_11_elems *elems,
1520                                   bool beacon)
1521 {
1522         struct ieee80211_local *local = sdata->local;
1523         int freq;
1524         struct ieee80211_bss *bss;
1525         struct sta_info *sta;
1526         struct ieee80211_channel *channel;
1527         u64 beacon_timestamp, rx_timestamp;
1528         u64 supp_rates = 0;
1529         enum ieee80211_band band = rx_status->band;
1530
1531         if (elems->ds_params && elems->ds_params_len == 1)
1532                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1533         else
1534                 freq = rx_status->freq;
1535
1536         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1537
1538         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1539                 return;
1540
1541         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1542             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1543                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1544
1545                 rcu_read_lock();
1546
1547                 sta = sta_info_get(local, mgmt->sa);
1548                 if (sta) {
1549                         u64 prev_rates;
1550
1551                         prev_rates = sta->sta.supp_rates[band];
1552                         /* make sure mandatory rates are always added */
1553                         sta->sta.supp_rates[band] = supp_rates |
1554                                 ieee80211_mandatory_rates(local, band);
1555
1556 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1557                         if (sta->sta.supp_rates[band] != prev_rates)
1558                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1559                                     "for %pM based on beacon info (0x%llx | "
1560                                     "0x%llx -> 0x%llx)\n",
1561                                     sdata->dev->name,
1562                                     sta->sta.addr,
1563                                     (unsigned long long) prev_rates,
1564                                     (unsigned long long) supp_rates,
1565                                     (unsigned long long) sta->sta.supp_rates[band]);
1566 #endif
1567                 } else {
1568                         ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
1569                                                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 = local->hw.wiphy->bands[band]->
1617                                         bitrates[rx_status->rate_idx].bitrate;
1618                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1619                 } else if (local && local->ops && local->ops->get_tsf)
1620                         /* second best option: get current TSF */
1621                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1622                 else
1623                         /* can't merge without knowing the TSF */
1624                         rx_timestamp = -1LLU;
1625 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1626                 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1627                        "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1628                        mgmt->sa, mgmt->bssid,
1629                        (unsigned long long)rx_timestamp,
1630                        (unsigned long long)beacon_timestamp,
1631                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1632                        jiffies);
1633 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1634                 if (beacon_timestamp > rx_timestamp) {
1635 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1636                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1637                                "local TSF - IBSS merge with BSSID %pM\n",
1638                                sdata->dev->name, mgmt->bssid);
1639 #endif
1640                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1641                         ieee80211_ibss_add_sta(sdata, NULL,
1642                                                mgmt->bssid, mgmt->sa,
1643                                                supp_rates);
1644                 }
1645         }
1646
1647         ieee80211_rx_bss_put(local, bss);
1648 }
1649
1650
1651 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1652                                          struct ieee80211_mgmt *mgmt,
1653                                          size_t len,
1654                                          struct ieee80211_rx_status *rx_status)
1655 {
1656         size_t baselen;
1657         struct ieee802_11_elems elems;
1658         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1659
1660         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1661                 return; /* ignore ProbeResp to foreign address */
1662
1663         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1664         if (baselen > len)
1665                 return;
1666
1667         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1668                                 &elems);
1669
1670         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1671
1672         /* direct probe may be part of the association flow */
1673         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1674                                                         &ifsta->request)) {
1675                 printk(KERN_DEBUG "%s direct probe responded\n",
1676                        sdata->dev->name);
1677                 ieee80211_authenticate(sdata, ifsta);
1678         }
1679 }
1680
1681
1682 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1683                                      struct ieee80211_mgmt *mgmt,
1684                                      size_t len,
1685                                      struct ieee80211_rx_status *rx_status)
1686 {
1687         struct ieee80211_if_sta *ifsta;
1688         size_t baselen;
1689         struct ieee802_11_elems elems;
1690         struct ieee80211_local *local = sdata->local;
1691         u32 changed = 0;
1692         bool erp_valid;
1693         u8 erp_value = 0;
1694
1695         /* Process beacon from the current BSS */
1696         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1697         if (baselen > len)
1698                 return;
1699
1700         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1701
1702         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1703
1704         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1705                 return;
1706         ifsta = &sdata->u.sta;
1707
1708         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1709             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1710                 return;
1711
1712         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1713                                  elems.wmm_param_len);
1714
1715
1716         if (elems.erp_info && elems.erp_info_len >= 1) {
1717                 erp_valid = true;
1718                 erp_value = elems.erp_info[0];
1719         } else {
1720                 erp_valid = false;
1721         }
1722         changed |= ieee80211_handle_bss_capability(sdata,
1723                         le16_to_cpu(mgmt->u.beacon.capab_info),
1724                         erp_valid, erp_value);
1725
1726
1727         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1728                 struct sta_info *sta;
1729                 struct ieee80211_supported_band *sband;
1730                 u16 ap_ht_cap_flags;
1731
1732                 rcu_read_lock();
1733
1734                 sta = sta_info_get(local, ifsta->bssid);
1735                 if (!sta) {
1736                         rcu_read_unlock();
1737                         return;
1738                 }
1739
1740                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1741
1742                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1743                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1744
1745                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1746
1747                 rcu_read_unlock();
1748
1749                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1750                                                ap_ht_cap_flags);
1751         }
1752
1753         if (elems.country_elem) {
1754                 /* Note we are only reviewing this on beacons
1755                  * for the BSSID we are associated to */
1756                 regulatory_hint_11d(local->hw.wiphy,
1757                         elems.country_elem, elems.country_elem_len);
1758         }
1759
1760         ieee80211_bss_info_change_notify(sdata, changed);
1761 }
1762
1763
1764 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1765                                         struct ieee80211_if_sta *ifsta,
1766                                         struct ieee80211_mgmt *mgmt,
1767                                         size_t len,
1768                                         struct ieee80211_rx_status *rx_status)
1769 {
1770         struct ieee80211_local *local = sdata->local;
1771         int tx_last_beacon;
1772         struct sk_buff *skb;
1773         struct ieee80211_mgmt *resp;
1774         u8 *pos, *end;
1775
1776         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1777             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1778             len < 24 + 2 || !ifsta->probe_resp)
1779                 return;
1780
1781         if (local->ops->tx_last_beacon)
1782                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1783         else
1784                 tx_last_beacon = 1;
1785
1786 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1787         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1788                " (tx_last_beacon=%d)\n",
1789                sdata->dev->name, mgmt->sa, mgmt->da,
1790                mgmt->bssid, tx_last_beacon);
1791 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1792
1793         if (!tx_last_beacon)
1794                 return;
1795
1796         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1797             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1798                 return;
1799
1800         end = ((u8 *) mgmt) + len;
1801         pos = mgmt->u.probe_req.variable;
1802         if (pos[0] != WLAN_EID_SSID ||
1803             pos + 2 + pos[1] > end) {
1804 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1805                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1806                        "from %pM\n",
1807                        sdata->dev->name, mgmt->sa);
1808 #endif
1809                 return;
1810         }
1811         if (pos[1] != 0 &&
1812             (pos[1] != ifsta->ssid_len ||
1813              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1814                 /* Ignore ProbeReq for foreign SSID */
1815                 return;
1816         }
1817
1818         /* Reply with ProbeResp */
1819         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1820         if (!skb)
1821                 return;
1822
1823         resp = (struct ieee80211_mgmt *) skb->data;
1824         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1825 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1826         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1827                sdata->dev->name, resp->da);
1828 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1829         ieee80211_tx_skb(sdata, skb, 0);
1830 }
1831
1832 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1833                            struct ieee80211_rx_status *rx_status)
1834 {
1835         struct ieee80211_local *local = sdata->local;
1836         struct ieee80211_if_sta *ifsta;
1837         struct ieee80211_mgmt *mgmt;
1838         u16 fc;
1839
1840         if (skb->len < 24)
1841                 goto fail;
1842
1843         ifsta = &sdata->u.sta;
1844
1845         mgmt = (struct ieee80211_mgmt *) skb->data;
1846         fc = le16_to_cpu(mgmt->frame_control);
1847
1848         switch (fc & IEEE80211_FCTL_STYPE) {
1849         case IEEE80211_STYPE_PROBE_REQ:
1850         case IEEE80211_STYPE_PROBE_RESP:
1851         case IEEE80211_STYPE_BEACON:
1852                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1853         case IEEE80211_STYPE_AUTH:
1854         case IEEE80211_STYPE_ASSOC_RESP:
1855         case IEEE80211_STYPE_REASSOC_RESP:
1856         case IEEE80211_STYPE_DEAUTH:
1857         case IEEE80211_STYPE_DISASSOC:
1858                 skb_queue_tail(&ifsta->skb_queue, skb);
1859                 queue_work(local->hw.workqueue, &ifsta->work);
1860                 return;
1861         }
1862
1863  fail:
1864         kfree_skb(skb);
1865 }
1866
1867 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1868                                          struct sk_buff *skb)
1869 {
1870         struct ieee80211_rx_status *rx_status;
1871         struct ieee80211_if_sta *ifsta;
1872         struct ieee80211_mgmt *mgmt;
1873         u16 fc;
1874
1875         ifsta = &sdata->u.sta;
1876
1877         rx_status = (struct ieee80211_rx_status *) skb->cb;
1878         mgmt = (struct ieee80211_mgmt *) skb->data;
1879         fc = le16_to_cpu(mgmt->frame_control);
1880
1881         switch (fc & IEEE80211_FCTL_STYPE) {
1882         case IEEE80211_STYPE_PROBE_REQ:
1883                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1884                                             rx_status);
1885                 break;
1886         case IEEE80211_STYPE_PROBE_RESP:
1887                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1888                 break;
1889         case IEEE80211_STYPE_BEACON:
1890                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1891                 break;
1892         case IEEE80211_STYPE_AUTH:
1893                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1894                 break;
1895         case IEEE80211_STYPE_ASSOC_RESP:
1896                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1897                 break;
1898         case IEEE80211_STYPE_REASSOC_RESP:
1899                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1900                 break;
1901         case IEEE80211_STYPE_DEAUTH:
1902                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1903                 break;
1904         case IEEE80211_STYPE_DISASSOC:
1905                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1906                 break;
1907         }
1908
1909         kfree_skb(skb);
1910 }
1911
1912
1913 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1914 {
1915         struct ieee80211_local *local = sdata->local;
1916         int active = 0;
1917         struct sta_info *sta;
1918
1919         rcu_read_lock();
1920
1921         list_for_each_entry_rcu(sta, &local->sta_list, list) {
1922                 if (sta->sdata == sdata &&
1923                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1924                                jiffies)) {
1925                         active++;
1926                         break;
1927                 }
1928         }
1929
1930         rcu_read_unlock();
1931
1932         return active;
1933 }
1934
1935
1936 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1937                                      struct ieee80211_if_sta *ifsta)
1938 {
1939         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1940
1941         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1942         if (ieee80211_sta_active_ibss(sdata))
1943                 return;
1944
1945         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1946                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1947         ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1948 }
1949
1950
1951 static void ieee80211_sta_timer(unsigned long data)
1952 {
1953         struct ieee80211_sub_if_data *sdata =
1954                 (struct ieee80211_sub_if_data *) data;
1955         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1956         struct ieee80211_local *local = sdata->local;
1957
1958         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1959         queue_work(local->hw.workqueue, &ifsta->work);
1960 }
1961
1962 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1963                                      struct ieee80211_if_sta *ifsta)
1964 {
1965         struct ieee80211_local *local = sdata->local;
1966
1967         if (local->ops->reset_tsf) {
1968                 /* Reset own TSF to allow time synchronization work. */
1969                 local->ops->reset_tsf(local_to_hw(local));
1970         }
1971
1972         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1973
1974
1975         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1976                 ifsta->auth_alg = WLAN_AUTH_OPEN;
1977         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1978                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1979         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1980                 ifsta->auth_alg = WLAN_AUTH_LEAP;
1981         else
1982                 ifsta->auth_alg = WLAN_AUTH_OPEN;
1983         ifsta->auth_transaction = -1;
1984         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1985         ifsta->assoc_scan_tries = 0;
1986         ifsta->direct_probe_tries = 0;
1987         ifsta->auth_tries = 0;
1988         ifsta->assoc_tries = 0;
1989         netif_tx_stop_all_queues(sdata->dev);
1990         netif_carrier_off(sdata->dev);
1991 }
1992
1993
1994 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
1995                                     const char *ssid, int ssid_len)
1996 {
1997         int tmp, hidden_ssid;
1998
1999         if (ssid_len == ifsta->ssid_len &&
2000             !memcmp(ifsta->ssid, ssid, ssid_len))
2001                 return 1;
2002
2003         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2004                 return 0;
2005
2006         hidden_ssid = 1;
2007         tmp = ssid_len;
2008         while (tmp--) {
2009                 if (ssid[tmp] != '\0') {
2010                         hidden_ssid = 0;
2011                         break;
2012                 }
2013         }
2014
2015         if (hidden_ssid && ifsta->ssid_len == ssid_len)
2016                 return 1;
2017
2018         if (ssid_len == 1 && ssid[0] == ' ')
2019                 return 1;
2020
2021         return 0;
2022 }
2023
2024 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2025                                      struct ieee80211_if_sta *ifsta)
2026 {
2027         struct ieee80211_local *local = sdata->local;
2028         struct ieee80211_bss *bss;
2029         struct ieee80211_supported_band *sband;
2030         u8 bssid[ETH_ALEN], *pos;
2031         int i;
2032         int ret;
2033
2034 #if 0
2035         /* Easier testing, use fixed BSSID. */
2036         memset(bssid, 0xfe, ETH_ALEN);
2037 #else
2038         /* Generate random, not broadcast, locally administered BSSID. Mix in
2039          * own MAC address to make sure that devices that do not have proper
2040          * random number generator get different BSSID. */
2041         get_random_bytes(bssid, ETH_ALEN);
2042         for (i = 0; i < ETH_ALEN; i++)
2043                 bssid[i] ^= sdata->dev->dev_addr[i];
2044         bssid[0] &= ~0x01;
2045         bssid[0] |= 0x02;
2046 #endif
2047
2048         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2049                sdata->dev->name, bssid);
2050
2051         bss = ieee80211_rx_bss_add(local, bssid,
2052                                    local->hw.conf.channel->center_freq,
2053                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2054         if (!bss)
2055                 return -ENOMEM;
2056
2057         bss->band = local->hw.conf.channel->band;
2058         sband = local->hw.wiphy->bands[bss->band];
2059
2060         if (local->hw.conf.beacon_int == 0)
2061                 local->hw.conf.beacon_int = 100;
2062         bss->beacon_int = local->hw.conf.beacon_int;
2063         bss->last_update = jiffies;
2064         bss->capability = WLAN_CAPABILITY_IBSS;
2065
2066         if (sdata->default_key)
2067                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2068         else
2069                 sdata->drop_unencrypted = 0;
2070
2071         bss->supp_rates_len = sband->n_bitrates;
2072         pos = bss->supp_rates;
2073         for (i = 0; i < sband->n_bitrates; i++) {
2074                 int rate = sband->bitrates[i].bitrate;
2075                 *pos++ = (u8) (rate / 5);
2076         }
2077
2078         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2079         ieee80211_rx_bss_put(local, bss);
2080         return ret;
2081 }
2082
2083
2084 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2085                                    struct ieee80211_if_sta *ifsta)
2086 {
2087         struct ieee80211_local *local = sdata->local;
2088         struct ieee80211_bss *bss;
2089         int found = 0;
2090         u8 bssid[ETH_ALEN];
2091         int active_ibss;
2092
2093         if (ifsta->ssid_len == 0)
2094                 return -EINVAL;
2095
2096         active_ibss = ieee80211_sta_active_ibss(sdata);
2097 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2098         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2099                sdata->dev->name, active_ibss);
2100 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2101         spin_lock_bh(&local->bss_lock);
2102         list_for_each_entry(bss, &local->bss_list, list) {
2103                 if (ifsta->ssid_len != bss->ssid_len ||
2104                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2105                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2106                         continue;
2107 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2108                 printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
2109 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2110                 memcpy(bssid, bss->bssid, ETH_ALEN);
2111                 found = 1;
2112                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2113                         break;
2114         }
2115         spin_unlock_bh(&local->bss_lock);
2116
2117 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2118         if (found)
2119                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2120                        "%pM\n", bssid, ifsta->bssid);
2121 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2122
2123         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2124                 int ret;
2125                 int search_freq;
2126
2127                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2128                         search_freq = bss->freq;
2129                 else
2130                         search_freq = local->hw.conf.channel->center_freq;
2131
2132                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2133                                            ifsta->ssid, ifsta->ssid_len);
2134                 if (!bss)
2135                         goto dont_join;
2136
2137                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2138                        " based on configured SSID\n",
2139                        sdata->dev->name, bssid);
2140                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2141                 ieee80211_rx_bss_put(local, bss);
2142                 return ret;
2143         }
2144
2145 dont_join:
2146 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2147         printk(KERN_DEBUG "   did not try to join ibss\n");
2148 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2149
2150         /* Selected IBSS not found in current scan results - try to scan */
2151         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2152             !ieee80211_sta_active_ibss(sdata)) {
2153                 mod_timer(&ifsta->timer, jiffies +
2154                                       IEEE80211_IBSS_MERGE_INTERVAL);
2155         } else if (time_after(jiffies, local->last_scan_completed +
2156                               IEEE80211_SCAN_INTERVAL)) {
2157                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2158                        "join\n", sdata->dev->name);
2159                 return ieee80211_request_scan(sdata, ifsta->ssid,
2160                                               ifsta->ssid_len);
2161         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2162                 int interval = IEEE80211_SCAN_INTERVAL;
2163
2164                 if (time_after(jiffies, ifsta->ibss_join_req +
2165                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2166                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2167                             (!(local->oper_channel->flags &
2168                                         IEEE80211_CHAN_NO_IBSS)))
2169                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2170                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2171                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2172                                        " %d MHz\n", sdata->dev->name,
2173                                        local->hw.conf.channel->center_freq);
2174                         }
2175
2176                         /* No IBSS found - decrease scan interval and continue
2177                          * scanning. */
2178                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2179                 }
2180
2181                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2182                 mod_timer(&ifsta->timer, jiffies + interval);
2183                 return 0;
2184         }
2185
2186         return 0;
2187 }
2188
2189
2190 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2191                                      struct ieee80211_if_sta *ifsta)
2192 {
2193         struct ieee80211_local *local = sdata->local;
2194         struct ieee80211_bss *bss, *selected = NULL;
2195         int top_rssi = 0, freq;
2196
2197         spin_lock_bh(&local->bss_lock);
2198         freq = local->oper_channel->center_freq;
2199         list_for_each_entry(bss, &local->bss_list, list) {
2200                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2201                         continue;
2202
2203                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2204                         IEEE80211_STA_AUTO_BSSID_SEL |
2205                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2206                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2207                      !!sdata->default_key))
2208                         continue;
2209
2210                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2211                     bss->freq != freq)
2212                         continue;
2213
2214                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2215                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2216                         continue;
2217
2218                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2219                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2220                         continue;
2221
2222                 if (!selected || top_rssi < bss->signal) {
2223                         selected = bss;
2224                         top_rssi = bss->signal;
2225                 }
2226         }
2227         if (selected)
2228                 atomic_inc(&selected->users);
2229         spin_unlock_bh(&local->bss_lock);
2230
2231         if (selected) {
2232                 ieee80211_set_freq(sdata, selected->freq);
2233                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2234                         ieee80211_sta_set_ssid(sdata, selected->ssid,
2235                                                selected->ssid_len);
2236                 ieee80211_sta_set_bssid(sdata, selected->bssid);
2237                 ieee80211_sta_def_wmm_params(sdata, selected);
2238
2239                 /* Send out direct probe if no probe resp was received or
2240                  * the one we have is outdated
2241                  */
2242                 if (!selected->last_probe_resp ||
2243                     time_after(jiffies, selected->last_probe_resp
2244                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2245                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2246                 else
2247                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2248
2249                 ieee80211_rx_bss_put(local, selected);
2250                 ieee80211_sta_reset_auth(sdata, ifsta);
2251                 return 0;
2252         } else {
2253                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2254                         ifsta->assoc_scan_tries++;
2255                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2256                                 ieee80211_start_scan(sdata, NULL, 0);
2257                         else
2258                                 ieee80211_start_scan(sdata, ifsta->ssid,
2259                                                          ifsta->ssid_len);
2260                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2261                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2262                 } else
2263                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2264         }
2265         return -1;
2266 }
2267
2268
2269 static void ieee80211_sta_work(struct work_struct *work)
2270 {
2271         struct ieee80211_sub_if_data *sdata =
2272                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2273         struct ieee80211_local *local = sdata->local;
2274         struct ieee80211_if_sta *ifsta;
2275         struct sk_buff *skb;
2276
2277         if (!netif_running(sdata->dev))
2278                 return;
2279
2280         if (local->sw_scanning || local->hw_scanning)
2281                 return;
2282
2283         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2284                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2285                 return;
2286         ifsta = &sdata->u.sta;
2287
2288         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2289                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2290
2291         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2292             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2293             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2294             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2295                 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2296                                      ifsta->scan_ssid_len);
2297                 return;
2298         }
2299
2300         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2301                 if (ieee80211_sta_config_auth(sdata, ifsta))
2302                         return;
2303                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2304         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2305                 return;
2306
2307         switch (ifsta->state) {
2308         case IEEE80211_STA_MLME_DISABLED:
2309                 break;
2310         case IEEE80211_STA_MLME_DIRECT_PROBE:
2311                 ieee80211_direct_probe(sdata, ifsta);
2312                 break;
2313         case IEEE80211_STA_MLME_AUTHENTICATE:
2314                 ieee80211_authenticate(sdata, ifsta);
2315                 break;
2316         case IEEE80211_STA_MLME_ASSOCIATE:
2317                 ieee80211_associate(sdata, ifsta);
2318                 break;
2319         case IEEE80211_STA_MLME_ASSOCIATED:
2320                 ieee80211_associated(sdata, ifsta);
2321                 break;
2322         case IEEE80211_STA_MLME_IBSS_SEARCH:
2323                 ieee80211_sta_find_ibss(sdata, ifsta);
2324                 break;
2325         case IEEE80211_STA_MLME_IBSS_JOINED:
2326                 ieee80211_sta_merge_ibss(sdata, ifsta);
2327                 break;
2328         default:
2329                 WARN_ON(1);
2330                 break;
2331         }
2332
2333         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2334                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2335                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2336
2337                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2338                                         WLAN_REASON_UNSPECIFIED);
2339         }
2340 }
2341
2342 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2343 {
2344         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2345                 queue_work(sdata->local->hw.workqueue,
2346                            &sdata->u.sta.work);
2347 }
2348
2349 /* interface setup */
2350 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2351 {
2352         struct ieee80211_if_sta *ifsta;
2353
2354         ifsta = &sdata->u.sta;
2355         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2356         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2357                     (unsigned long) sdata);
2358         skb_queue_head_init(&ifsta->skb_queue);
2359
2360         ifsta->capab = WLAN_CAPABILITY_ESS;
2361         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2362                 IEEE80211_AUTH_ALG_SHARED_KEY;
2363         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2364                 IEEE80211_STA_AUTO_BSSID_SEL |
2365                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2366         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2367                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2368 }
2369
2370 /*
2371  * Add a new IBSS station, will also be called by the RX code when,
2372  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2373  * must be callable in atomic context.
2374  */
2375 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2376                                         struct sk_buff *skb, u8 *bssid,
2377                                         u8 *addr, u64 supp_rates)
2378 {
2379         struct ieee80211_local *local = sdata->local;
2380         struct sta_info *sta;
2381         int band = local->hw.conf.channel->band;
2382
2383         /* TODO: Could consider removing the least recently used entry and
2384          * allow new one to be added. */
2385         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2386                 if (net_ratelimit()) {
2387                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2388                                "entry %pM\n", sdata->dev->name, addr);
2389                 }
2390                 return NULL;
2391         }
2392
2393         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2394                 return NULL;
2395
2396 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2397         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2398                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2399 #endif
2400
2401         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2402         if (!sta)
2403                 return NULL;
2404
2405         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2406
2407         /* make sure mandatory rates are always added */
2408         sta->sta.supp_rates[band] = supp_rates |
2409                         ieee80211_mandatory_rates(local, band);
2410
2411         rate_control_rate_init(sta);
2412
2413         if (sta_info_insert(sta))
2414                 return NULL;
2415
2416         return sta;
2417 }
2418
2419 /* configuration hooks */
2420 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2421                             struct ieee80211_if_sta *ifsta)
2422 {
2423         struct ieee80211_local *local = sdata->local;
2424
2425         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2426                 return;
2427
2428         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2429                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2430             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2431                              IEEE80211_STA_AUTO_SSID_SEL))) {
2432
2433                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2434                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2435                                                WLAN_REASON_DEAUTH_LEAVING);
2436
2437                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2438                 queue_work(local->hw.workqueue, &ifsta->work);
2439         }
2440 }
2441
2442 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2443 {
2444         struct ieee80211_if_sta *ifsta;
2445
2446         if (len > IEEE80211_MAX_SSID_LEN)
2447                 return -EINVAL;
2448
2449         ifsta = &sdata->u.sta;
2450
2451         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2452                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2453                 memcpy(ifsta->ssid, ssid, len);
2454                 ifsta->ssid_len = len;
2455                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2456         }
2457
2458         if (len)
2459                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2460         else
2461                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2462
2463         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2464             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2465                 ifsta->ibss_join_req = jiffies;
2466                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2467                 return ieee80211_sta_find_ibss(sdata, ifsta);
2468         }
2469
2470         return 0;
2471 }
2472
2473 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2474 {
2475         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2476         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2477         *len = ifsta->ssid_len;
2478         return 0;
2479 }
2480
2481 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2482 {
2483         struct ieee80211_if_sta *ifsta;
2484         int res;
2485
2486         ifsta = &sdata->u.sta;
2487
2488         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2489                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2490                 res = 0;
2491                 /*
2492                  * Hack! See also ieee80211_sta_set_ssid.
2493                  */
2494                 if (netif_running(sdata->dev))
2495                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2496                 if (res) {
2497                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2498                                "the low-level driver\n", sdata->dev->name);
2499                         return res;
2500                 }
2501         }
2502
2503         if (is_valid_ether_addr(bssid))
2504                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2505         else
2506                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2507
2508         return 0;
2509 }
2510
2511 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2512 {
2513         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2514
2515         kfree(ifsta->extra_ie);
2516         if (len == 0) {
2517                 ifsta->extra_ie = NULL;
2518                 ifsta->extra_ie_len = 0;
2519                 return 0;
2520         }
2521         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2522         if (!ifsta->extra_ie) {
2523                 ifsta->extra_ie_len = 0;
2524                 return -ENOMEM;
2525         }
2526         memcpy(ifsta->extra_ie, ie, len);
2527         ifsta->extra_ie_len = len;
2528         return 0;
2529 }
2530
2531 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2532 {
2533         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2534
2535         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2536                sdata->dev->name, reason);
2537
2538         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2539             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2540                 return -EINVAL;
2541
2542         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2543         return 0;
2544 }
2545
2546 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2547 {
2548         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2549
2550         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2551                sdata->dev->name, reason);
2552
2553         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2554                 return -EINVAL;
2555
2556         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2557                 return -1;
2558
2559         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2560         return 0;
2561 }
2562
2563 /* scan finished notification */
2564 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2565 {
2566         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2567         struct ieee80211_if_sta *ifsta;
2568
2569         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2570                 ifsta = &sdata->u.sta;
2571                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2572                     (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2573                     !ieee80211_sta_active_ibss(sdata)))
2574                         ieee80211_sta_find_ibss(sdata, ifsta);
2575         }
2576
2577         /* Restart STA timers */
2578         rcu_read_lock();
2579         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2580                 ieee80211_restart_sta_timer(sdata);
2581         rcu_read_unlock();
2582 }