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/netdevice.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/wireless.h>
  20 #include <linux/random.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/rtnetlink.h>
  23 #include <net/iw_handler.h>
  24 #include <net/mac80211.h>
  25 #include <asm/unaligned.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "rate.h"
  29 #include "led.h"
  30
  31 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  32 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  33 #define IEEE80211_AUTH_MAX_TRIES 3
  34 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  35 #define IEEE80211_ASSOC_MAX_TRIES 3
  36 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  37 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  38 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  39 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  40 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  41 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  42
  43 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  44 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  45
  46 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  47
  48
  49 /* utils */
  50 static int ecw2cw(int ecw)
  51 {
  52         return (1 << ecw) - 1;
  53 }
  54
  55 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  56 {
  57         u8 *end, *pos;
  58
  59         pos = bss->ies;
  60         if (pos == NULL)
  61                 return NULL;
  62         end = pos + bss->ies_len;
  63
  64         while (pos + 1 < end) {
  65                 if (pos + 2 + pos[1] > end)
  66                         break;
  67                 if (pos[0] == ie)
  68                         return pos;
  69                 pos += 2 + pos[1];
  70         }
  71
  72         return NULL;
  73 }
  74
  75 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  76                                       struct ieee80211_supported_band *sband,
  77                                       u64 *rates)
  78 {
  79         int i, j, count;
  80         *rates = 0;
  81         count = 0;
  82         for (i = 0; i < bss->supp_rates_len; i++) {
  83                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  84
  85                 for (j = 0; j < sband->n_bitrates; j++)
  86                         if (sband->bitrates[j].bitrate == rate) {
  87                                 *rates |= BIT(j);
  88                                 count++;
  89                                 break;
  90                         }
  91         }
  92
  93         return count;
  94 }
  95
  96 /* also used by mesh code */
  97 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
  98                             struct ieee802_11_elems *elems,
  99                             enum ieee80211_band band)
 100 {
 101         struct ieee80211_supported_band *sband;
 102         struct ieee80211_rate *bitrates;
 103         size_t num_rates;
 104         u64 supp_rates;
 105         int i, j;
 106         sband = local->hw.wiphy->bands[band];
 107
 108         if (!sband) {
 109                 WARN_ON(1);
 110                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 111         }
 112
 113         bitrates = sband->bitrates;
 114         num_rates = sband->n_bitrates;
 115         supp_rates = 0;
 116         for (i = 0; i < elems->supp_rates_len +
 117                      elems->ext_supp_rates_len; i++) {
 118                 u8 rate = 0;
 119                 int own_rate;
 120                 if (i < elems->supp_rates_len)
 121                         rate = elems->supp_rates[i];
 122                 else if (elems->ext_supp_rates)
 123                         rate = elems->ext_supp_rates
 124                                 [i - elems->supp_rates_len];
 125                 own_rate = 5 * (rate & 0x7f);
 126                 for (j = 0; j < num_rates; j++)
 127                         if (bitrates[j].bitrate == own_rate)
 128                                 supp_rates |= BIT(j);
 129         }
 130         return supp_rates;
 131 }
 132
 133 /* frame sending functions */
 134
 135 /* also used by scanning code */
 136 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 137                               u8 *ssid, size_t ssid_len)
 138 {
 139         struct ieee80211_local *local = sdata->local;
 140         struct ieee80211_supported_band *sband;
 141         struct sk_buff *skb;
 142         struct ieee80211_mgmt *mgmt;
 143         u8 *pos, *supp_rates, *esupp_rates = NULL;
 144         int i;
 145
 146         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
 147         if (!skb) {
 148                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 149                        "request\n", sdata->dev->name);
 150                 return;
 151         }
 152         skb_reserve(skb, local->hw.extra_tx_headroom);
 153
 154         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 155         memset(mgmt, 0, 24);
 156         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 157                                           IEEE80211_STYPE_PROBE_REQ);
 158         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 159         if (dst) {
 160                 memcpy(mgmt->da, dst, ETH_ALEN);
 161                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 162         } else {
 163                 memset(mgmt->da, 0xff, ETH_ALEN);
 164                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 165         }
 166         pos = skb_put(skb, 2 + ssid_len);
 167         *pos++ = WLAN_EID_SSID;
 168         *pos++ = ssid_len;
 169         memcpy(pos, ssid, ssid_len);
 170
 171         supp_rates = skb_put(skb, 2);
 172         supp_rates[0] = WLAN_EID_SUPP_RATES;
 173         supp_rates[1] = 0;
 174         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 175
 176         for (i = 0; i < sband->n_bitrates; i++) {
 177                 struct ieee80211_rate *rate = &sband->bitrates[i];
 178                 if (esupp_rates) {
 179                         pos = skb_put(skb, 1);
 180                         esupp_rates[1]++;
 181                 } else if (supp_rates[1] == 8) {
 182                         esupp_rates = skb_put(skb, 3);
 183                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 184                         esupp_rates[1] = 1;
 185                         pos = &esupp_rates[2];
 186                 } else {
 187                         pos = skb_put(skb, 1);
 188                         supp_rates[1]++;
 189                 }
 190                 *pos = rate->bitrate / 5;
 191         }
 192
 193         ieee80211_tx_skb(sdata, skb, 0);
 194 }
 195
 196 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 197                                 struct ieee80211_if_sta *ifsta,
 198                                 int transaction, u8 *extra, size_t extra_len,
 199                                 int encrypt)
 200 {
 201         struct ieee80211_local *local = sdata->local;
 202         struct sk_buff *skb;
 203         struct ieee80211_mgmt *mgmt;
 204
 205         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 206                             sizeof(*mgmt) + 6 + extra_len);
 207         if (!skb) {
 208                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 209                        "frame\n", sdata->dev->name);
 210                 return;
 211         }
 212         skb_reserve(skb, local->hw.extra_tx_headroom);
 213
 214         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 215         memset(mgmt, 0, 24 + 6);
 216         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 217                                           IEEE80211_STYPE_AUTH);
 218         if (encrypt)
 219                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 220         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 221         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 222         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 223         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 224         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 225         ifsta->auth_transaction = transaction + 1;
 226         mgmt->u.auth.status_code = cpu_to_le16(0);
 227         if (extra)
 228                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 229
 230         ieee80211_tx_skb(sdata, skb, encrypt);
 231 }
 232
 233 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 234                                  struct ieee80211_if_sta *ifsta)
 235 {
 236         struct ieee80211_local *local = sdata->local;
 237         struct sk_buff *skb;
 238         struct ieee80211_mgmt *mgmt;
 239         u8 *pos, *ies, *ht_add_ie;
 240         int i, len, count, rates_len, supp_rates_len;
 241         u16 capab;
 242         struct ieee80211_bss *bss;
 243         int wmm = 0;
 244         struct ieee80211_supported_band *sband;
 245         u64 rates = 0;
 246
 247         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 248                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 249                             ifsta->ssid_len);
 250         if (!skb) {
 251                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 252                        "frame\n", sdata->dev->name);
 253                 return;
 254         }
 255         skb_reserve(skb, local->hw.extra_tx_headroom);
 256
 257         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 258
 259         capab = ifsta->capab;
 260
 261         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 262                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 263                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 264                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 265                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 266         }
 267
 268         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 269                                    local->hw.conf.channel->center_freq,
 270                                    ifsta->ssid, ifsta->ssid_len);
 271         if (bss) {
 272                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 273                         capab |= WLAN_CAPABILITY_PRIVACY;
 274                 if (bss->wmm_used)
 275                         wmm = 1;
 276
 277                 /* get all rates supported by the device and the AP as
 278                  * some APs don't like getting a superset of their rates
 279                  * in the association request (e.g. D-Link DAP 1353 in
 280                  * b-only mode) */
 281                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 282
 283                 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 284                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 285                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 286
 287                 ieee80211_rx_bss_put(local, bss);
 288         } else {
 289                 rates = ~0;
 290                 rates_len = sband->n_bitrates;
 291         }
 292
 293         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 294         memset(mgmt, 0, 24);
 295         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 296         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 297         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 298
 299         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 300                 skb_put(skb, 10);
 301                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 302                                                   IEEE80211_STYPE_REASSOC_REQ);
 303                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 304                 mgmt->u.reassoc_req.listen_interval =
 305                                 cpu_to_le16(local->hw.conf.listen_interval);
 306                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 307                        ETH_ALEN);
 308         } else {
 309                 skb_put(skb, 4);
 310                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 311                                                   IEEE80211_STYPE_ASSOC_REQ);
 312                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 313                 mgmt->u.reassoc_req.listen_interval =
 314                                 cpu_to_le16(local->hw.conf.listen_interval);
 315         }
 316
 317         /* SSID */
 318         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 319         *pos++ = WLAN_EID_SSID;
 320         *pos++ = ifsta->ssid_len;
 321         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 322
 323         /* add all rates which were marked to be used above */
 324         supp_rates_len = rates_len;
 325         if (supp_rates_len > 8)
 326                 supp_rates_len = 8;
 327
 328         len = sband->n_bitrates;
 329         pos = skb_put(skb, supp_rates_len + 2);
 330         *pos++ = WLAN_EID_SUPP_RATES;
 331         *pos++ = supp_rates_len;
 332
 333         count = 0;
 334         for (i = 0; i < sband->n_bitrates; i++) {
 335                 if (BIT(i) & rates) {
 336                         int rate = sband->bitrates[i].bitrate;
 337                         *pos++ = (u8) (rate / 5);
 338                         if (++count == 8)
 339                                 break;
 340                 }
 341         }
 342
 343         if (rates_len > count) {
 344                 pos = skb_put(skb, rates_len - count + 2);
 345                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 346                 *pos++ = rates_len - count;
 347
 348                 for (i++; i < sband->n_bitrates; i++) {
 349                         if (BIT(i) & rates) {
 350                                 int rate = sband->bitrates[i].bitrate;
 351                                 *pos++ = (u8) (rate / 5);
 352                         }
 353                 }
 354         }
 355
 356         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 357                 /* 1. power capabilities */
 358                 pos = skb_put(skb, 4);
 359                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 360                 *pos++ = 2;
 361                 *pos++ = 0; /* min tx power */
 362                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 363
 364                 /* 2. supported channels */
 365                 /* TODO: get this in reg domain format */
 366                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 367                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 368                 *pos++ = 2 * sband->n_channels;
 369                 for (i = 0; i < sband->n_channels; i++) {
 370                         *pos++ = ieee80211_frequency_to_channel(
 371                                         sband->channels[i].center_freq);
 372                         *pos++ = 1; /* one channel in the subband*/
 373                 }
 374         }
 375
 376         if (ifsta->extra_ie) {
 377                 pos = skb_put(skb, ifsta->extra_ie_len);
 378                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 379         }
 380
 381         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 382                 pos = skb_put(skb, 9);
 383                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 384                 *pos++ = 7; /* len */
 385                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 386                 *pos++ = 0x50;
 387                 *pos++ = 0xf2;
 388                 *pos++ = 2; /* WME */
 389                 *pos++ = 0; /* WME info */
 390                 *pos++ = 1; /* WME ver */
 391                 *pos++ = 0;
 392         }
 393
 394         /* wmm support is a must to HT */
 395         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
 396             sband->ht_info.ht_supported &&
 397             (ht_add_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_EXTRA_INFO))) {
 398                 struct ieee80211_ht_addt_info *ht_add_info =
 399                         (struct ieee80211_ht_addt_info *)ht_add_ie;
 400                 u16 cap = sband->ht_info.cap;
 401                 __le16 tmp;
 402                 u32 flags = local->hw.conf.channel->flags;
 403
 404                 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
 405                 case IEEE80211_HT_IE_CHA_SEC_ABOVE:
 406                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 407                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
 408                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 409                         }
 410                         break;
 411                 case IEEE80211_HT_IE_CHA_SEC_BELOW:
 412                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 413                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
 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_info.ampdu_factor |
 428                          (sband->ht_info.ampdu_density << 2);
 429                 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
 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_protect_preamb(struct ieee80211_sub_if_data *sdata,
 572                                            bool use_protection,
 573                                            bool use_short_preamble)
 574 {
 575         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
 576 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 577         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 578 #endif
 579         u32 changed = 0;
 580
 581         if (use_protection != bss_conf->use_cts_prot) {
 582 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 583                 if (net_ratelimit()) {
 584                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 585                                sdata->dev->name,
 586                                use_protection ? "enabled" : "disabled",
 587                                ifsta->bssid);
 588                 }
 589 #endif
 590                 bss_conf->use_cts_prot = use_protection;
 591                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 592         }
 593
 594         if (use_short_preamble != bss_conf->use_short_preamble) {
 595 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 596                 if (net_ratelimit()) {
 597                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 598                                " (BSSID=%pM)\n",
 599                                sdata->dev->name,
 600                                use_short_preamble ? "short" : "long",
 601                                ifsta->bssid);
 602                 }
 603 #endif
 604                 bss_conf->use_short_preamble = use_short_preamble;
 605                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 606         }
 607
 608         return changed;
 609 }
 610
 611 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
 612                                    u8 erp_value)
 613 {
 614         bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
 615         bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
 616
 617         return ieee80211_handle_protect_preamb(sdata,
 618                         use_protection, use_short_preamble);
 619 }
 620
 621 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 622                                            struct ieee80211_bss *bss)
 623 {
 624         u32 changed = 0;
 625
 626         if (bss->has_erp_value)
 627                 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
 628         else {
 629                 u16 capab = bss->capability;
 630                 changed |= ieee80211_handle_protect_preamb(sdata, false,
 631                                 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
 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 {
 704         struct ieee80211_local *local = sdata->local;
 705         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 706         u32 changed = BSS_CHANGED_ASSOC;
 707
 708         struct ieee80211_bss *bss;
 709
 710         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 711
 712         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 713                 return;
 714
 715         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 716                                    conf->channel->center_freq,
 717                                    ifsta->ssid, ifsta->ssid_len);
 718         if (bss) {
 719                 /* set timing information */
 720                 sdata->bss_conf.beacon_int = bss->beacon_int;
 721                 sdata->bss_conf.timestamp = bss->timestamp;
 722                 sdata->bss_conf.dtim_period = bss->dtim_period;
 723
 724                 changed |= ieee80211_handle_bss_capability(sdata, bss);
 725
 726                 ieee80211_rx_bss_put(local, bss);
 727         }
 728
 729         if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
 730                 changed |= BSS_CHANGED_HT;
 731                 sdata->bss_conf.assoc_ht = 1;
 732                 sdata->bss_conf.ht_conf = &conf->ht_conf;
 733                 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
 734         }
 735
 736         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 737         memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 738         ieee80211_sta_send_associnfo(sdata, ifsta);
 739
 740         ifsta->last_probe = jiffies;
 741         ieee80211_led_assoc(local, 1);
 742
 743         sdata->bss_conf.assoc = 1;
 744         /*
 745          * For now just always ask the driver to update the basic rateset
 746          * when we have associated, we aren't checking whether it actually
 747          * changed or not.
 748          */
 749         changed |= BSS_CHANGED_BASIC_RATES;
 750         ieee80211_bss_info_change_notify(sdata, changed);
 751
 752         netif_tx_start_all_queues(sdata->dev);
 753         netif_carrier_on(sdata->dev);
 754
 755         ieee80211_sta_send_apinfo(sdata, ifsta);
 756 }
 757
 758 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 759                                    struct ieee80211_if_sta *ifsta)
 760 {
 761         ifsta->direct_probe_tries++;
 762         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 763                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 764                        sdata->dev->name, ifsta->bssid);
 765                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 766                 return;
 767         }
 768
 769         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 770                         sdata->dev->name, ifsta->bssid,
 771                         ifsta->direct_probe_tries);
 772
 773         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 774
 775         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
 776
 777         /* Direct probe is sent to broadcast address as some APs
 778          * will not answer to direct packet in unassociated state.
 779          */
 780         ieee80211_send_probe_req(sdata, NULL,
 781                                  ifsta->ssid, ifsta->ssid_len);
 782
 783         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 784 }
 785
 786
 787 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 788                                    struct ieee80211_if_sta *ifsta)
 789 {
 790         ifsta->auth_tries++;
 791         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 792                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 793                        " timed out\n",
 794                        sdata->dev->name, ifsta->bssid);
 795                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 796                 return;
 797         }
 798
 799         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
 800         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 801                sdata->dev->name, ifsta->bssid);
 802
 803         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
 804
 805         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 806 }
 807
 808 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 809                                    struct ieee80211_if_sta *ifsta, bool deauth,
 810                                    bool self_disconnected, u16 reason)
 811 {
 812         struct ieee80211_local *local = sdata->local;
 813         struct sta_info *sta;
 814         u32 changed = BSS_CHANGED_ASSOC;
 815
 816         rcu_read_lock();
 817
 818         sta = sta_info_get(local, ifsta->bssid);
 819         if (!sta) {
 820                 rcu_read_unlock();
 821                 return;
 822         }
 823
 824         if (deauth) {
 825                 ifsta->direct_probe_tries = 0;
 826                 ifsta->auth_tries = 0;
 827         }
 828         ifsta->assoc_scan_tries = 0;
 829         ifsta->assoc_tries = 0;
 830
 831         netif_tx_stop_all_queues(sdata->dev);
 832         netif_carrier_off(sdata->dev);
 833
 834         ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
 835
 836         if (self_disconnected) {
 837                 if (deauth)
 838                         ieee80211_send_deauth_disassoc(sdata,
 839                                 IEEE80211_STYPE_DEAUTH, reason);
 840                 else
 841                         ieee80211_send_deauth_disassoc(sdata,
 842                                 IEEE80211_STYPE_DISASSOC, reason);
 843         }
 844
 845         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 846         changed |= ieee80211_reset_erp_info(sdata);
 847
 848         if (sdata->bss_conf.assoc_ht)
 849                 changed |= BSS_CHANGED_HT;
 850
 851         sdata->bss_conf.assoc_ht = 0;
 852         sdata->bss_conf.ht_conf = NULL;
 853         sdata->bss_conf.ht_bss_conf = NULL;
 854
 855         ieee80211_led_assoc(local, 0);
 856         sdata->bss_conf.assoc = 0;
 857
 858         ieee80211_sta_send_apinfo(sdata, ifsta);
 859
 860         if (self_disconnected)
 861                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 862
 863         sta_info_unlink(&sta);
 864
 865         rcu_read_unlock();
 866
 867         sta_info_destroy(sta);
 868 }
 869
 870 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 871 {
 872         if (!sdata || !sdata->default_key ||
 873             sdata->default_key->conf.alg != ALG_WEP)
 874                 return 0;
 875         return 1;
 876 }
 877
 878 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
 879                                       struct ieee80211_if_sta *ifsta)
 880 {
 881         struct ieee80211_local *local = sdata->local;
 882         struct ieee80211_bss *bss;
 883         int bss_privacy;
 884         int wep_privacy;
 885         int privacy_invoked;
 886
 887         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
 888                 return 0;
 889
 890         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 891                                    local->hw.conf.channel->center_freq,
 892                                    ifsta->ssid, ifsta->ssid_len);
 893         if (!bss)
 894                 return 0;
 895
 896         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
 897         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
 898         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
 899
 900         ieee80211_rx_bss_put(local, bss);
 901
 902         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 903                 return 0;
 904
 905         return 1;
 906 }
 907
 908 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
 909                                 struct ieee80211_if_sta *ifsta)
 910 {
 911         ifsta->assoc_tries++;
 912         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 913                 printk(KERN_DEBUG "%s: association with AP %pM"
 914                        " timed out\n",
 915                        sdata->dev->name, ifsta->bssid);
 916                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 917                 return;
 918         }
 919
 920         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
 921         printk(KERN_DEBUG "%s: associate with AP %pM\n",
 922                sdata->dev->name, ifsta->bssid);
 923         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
 924                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 925                        "mixed-cell disabled - abort association\n", sdata->dev->name);
 926                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 927                 return;
 928         }
 929
 930         ieee80211_send_assoc(sdata, ifsta);
 931
 932         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 933 }
 934
 935
 936 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
 937                                  struct ieee80211_if_sta *ifsta)
 938 {
 939         struct ieee80211_local *local = sdata->local;
 940         struct sta_info *sta;
 941         int disassoc;
 942
 943         /* TODO: start monitoring current AP signal quality and number of
 944          * missed beacons. Scan other channels every now and then and search
 945          * for better APs. */
 946         /* TODO: remove expired BSSes */
 947
 948         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
 949
 950         rcu_read_lock();
 951
 952         sta = sta_info_get(local, ifsta->bssid);
 953         if (!sta) {
 954                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
 955                        sdata->dev->name, ifsta->bssid);
 956                 disassoc = 1;
 957         } else {
 958                 disassoc = 0;
 959                 if (time_after(jiffies,
 960                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 961                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
 962                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 963                                        "current AP %pM - assume out of "
 964                                        "range\n",
 965                                        sdata->dev->name, ifsta->bssid);
 966                                 disassoc = 1;
 967                         } else
 968                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
 969                                                          ifsta->ssid,
 970                                                          ifsta->ssid_len);
 971                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 972                 } else {
 973                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 974                         if (time_after(jiffies, ifsta->last_probe +
 975                                        IEEE80211_PROBE_INTERVAL)) {
 976                                 ifsta->last_probe = jiffies;
 977                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
 978                                                          ifsta->ssid,
 979                                                          ifsta->ssid_len);
 980                         }
 981                 }
 982         }
 983
 984         rcu_read_unlock();
 985
 986         if (disassoc)
 987                 ieee80211_set_disassoc(sdata, ifsta, true, true,
 988                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
 989         else
 990                 mod_timer(&ifsta->timer, jiffies +
 991                                       IEEE80211_MONITORING_INTERVAL);
 992 }
 993
 994
 995 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
 996                                      struct ieee80211_if_sta *ifsta)
 997 {
 998         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
 999         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1000         ieee80211_associate(sdata, ifsta);
1001 }
1002
1003
1004 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1005                                      struct ieee80211_if_sta *ifsta,
1006                                      struct ieee80211_mgmt *mgmt,
1007                                      size_t len)
1008 {
1009         u8 *pos;
1010         struct ieee802_11_elems elems;
1011
1012         pos = mgmt->u.auth.variable;
1013         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1014         if (!elems.challenge)
1015                 return;
1016         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1017                             elems.challenge_len + 2, 1);
1018 }
1019
1020 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1021                                    struct ieee80211_if_sta *ifsta,
1022                                    struct ieee80211_mgmt *mgmt,
1023                                    size_t len)
1024 {
1025         u16 auth_alg, auth_transaction, status_code;
1026
1027         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1028             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1029                 return;
1030
1031         if (len < 24 + 6)
1032                 return;
1033
1034         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1035             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1036                 return;
1037
1038         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1039             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1040                 return;
1041
1042         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1043         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1044         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1045
1046         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1047                 /*
1048                  * IEEE 802.11 standard does not require authentication in IBSS
1049                  * networks and most implementations do not seem to use it.
1050                  * However, try to reply to authentication attempts if someone
1051                  * has actually implemented this.
1052                  */
1053                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1054                         return;
1055                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1056         }
1057
1058         if (auth_alg != ifsta->auth_alg ||
1059             auth_transaction != ifsta->auth_transaction)
1060                 return;
1061
1062         if (status_code != WLAN_STATUS_SUCCESS) {
1063                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1064                         u8 algs[3];
1065                         const int num_algs = ARRAY_SIZE(algs);
1066                         int i, pos;
1067                         algs[0] = algs[1] = algs[2] = 0xff;
1068                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1069                                 algs[0] = WLAN_AUTH_OPEN;
1070                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1071                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1072                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1073                                 algs[2] = WLAN_AUTH_LEAP;
1074                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1075                                 pos = 0;
1076                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1077                                 pos = 1;
1078                         else
1079                                 pos = 2;
1080                         for (i = 0; i < num_algs; i++) {
1081                                 pos++;
1082                                 if (pos >= num_algs)
1083                                         pos = 0;
1084                                 if (algs[pos] == ifsta->auth_alg ||
1085                                     algs[pos] == 0xff)
1086                                         continue;
1087                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1088                                     !ieee80211_sta_wep_configured(sdata))
1089                                         continue;
1090                                 ifsta->auth_alg = algs[pos];
1091                                 break;
1092                         }
1093                 }
1094                 return;
1095         }
1096
1097         switch (ifsta->auth_alg) {
1098         case WLAN_AUTH_OPEN:
1099         case WLAN_AUTH_LEAP:
1100                 ieee80211_auth_completed(sdata, ifsta);
1101                 break;
1102         case WLAN_AUTH_SHARED_KEY:
1103                 if (ifsta->auth_transaction == 4)
1104                         ieee80211_auth_completed(sdata, ifsta);
1105                 else
1106                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1107                 break;
1108         }
1109 }
1110
1111
1112 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1113                                      struct ieee80211_if_sta *ifsta,
1114                                      struct ieee80211_mgmt *mgmt,
1115                                      size_t len)
1116 {
1117         u16 reason_code;
1118
1119         if (len < 24 + 2)
1120                 return;
1121
1122         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1123                 return;
1124
1125         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1126
1127         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1128                 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
1129
1130         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1131             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1132             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1133                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1134                 mod_timer(&ifsta->timer, jiffies +
1135                                       IEEE80211_RETRY_AUTH_INTERVAL);
1136         }
1137
1138         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1139         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1140 }
1141
1142
1143 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1144                                        struct ieee80211_if_sta *ifsta,
1145                                        struct ieee80211_mgmt *mgmt,
1146                                        size_t len)
1147 {
1148         u16 reason_code;
1149
1150         if (len < 24 + 2)
1151                 return;
1152
1153         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1154                 return;
1155
1156         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1157
1158         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1159                 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
1160
1161         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1162                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1163                 mod_timer(&ifsta->timer, jiffies +
1164                                       IEEE80211_RETRY_AUTH_INTERVAL);
1165         }
1166
1167         ieee80211_set_disassoc(sdata, ifsta, false, false, 0);
1168 }
1169
1170
1171 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1172                                          struct ieee80211_if_sta *ifsta,
1173                                          struct ieee80211_mgmt *mgmt,
1174                                          size_t len,
1175                                          int reassoc)
1176 {
1177         struct ieee80211_local *local = sdata->local;
1178         struct ieee80211_supported_band *sband;
1179         struct sta_info *sta;
1180         u64 rates, basic_rates;
1181         u16 capab_info, status_code, aid;
1182         struct ieee802_11_elems elems;
1183         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
1184         u8 *pos;
1185         int i, j;
1186         bool have_higher_than_11mbit = false;
1187
1188         /* AssocResp and ReassocResp have identical structure, so process both
1189          * of them in this function. */
1190
1191         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1192                 return;
1193
1194         if (len < 24 + 6)
1195                 return;
1196
1197         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1198                 return;
1199
1200         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1201         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1202         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1203
1204         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1205                "status=%d aid=%d)\n",
1206                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1207                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1208
1209         if (status_code != WLAN_STATUS_SUCCESS) {
1210                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1211                        sdata->dev->name, status_code);
1212                 /* if this was a reassociation, ensure we try a "full"
1213                  * association next time. This works around some broken APs
1214                  * which do not correctly reject reassociation requests. */
1215                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1216                 return;
1217         }
1218
1219         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1220                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1221                        "set\n", sdata->dev->name, aid);
1222         aid &= ~(BIT(15) | BIT(14));
1223
1224         pos = mgmt->u.assoc_resp.variable;
1225         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1226
1227         if (!elems.supp_rates) {
1228                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1229                        sdata->dev->name);
1230                 return;
1231         }
1232
1233         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1234         ifsta->aid = aid;
1235         ifsta->ap_capab = capab_info;
1236
1237         kfree(ifsta->assocresp_ies);
1238         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1239         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1240         if (ifsta->assocresp_ies)
1241                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1242
1243         rcu_read_lock();
1244
1245         /* Add STA entry for the AP */
1246         sta = sta_info_get(local, ifsta->bssid);
1247         if (!sta) {
1248                 struct ieee80211_bss *bss;
1249                 int err;
1250
1251                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1252                 if (!sta) {
1253                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1254                                " the AP\n", sdata->dev->name);
1255                         rcu_read_unlock();
1256                         return;
1257                 }
1258                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1259                                            local->hw.conf.channel->center_freq,
1260                                            ifsta->ssid, ifsta->ssid_len);
1261                 if (bss) {
1262                         sta->last_signal = bss->signal;
1263                         sta->last_qual = bss->qual;
1264                         sta->last_noise = bss->noise;
1265                         ieee80211_rx_bss_put(local, bss);
1266                 }
1267
1268                 err = sta_info_insert(sta);
1269                 if (err) {
1270                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1271                                " the AP (error %d)\n", sdata->dev->name, err);
1272                         rcu_read_unlock();
1273                         return;
1274                 }
1275                 /* update new sta with its last rx activity */
1276                 sta->last_rx = jiffies;
1277         }
1278
1279         /*
1280          * FIXME: Do we really need to update the sta_info's information here?
1281          *        We already know about the AP (we found it in our list) so it
1282          *        should already be filled with the right info, no?
1283          *        As is stands, all this is racy because typically we assume
1284          *        the information that is filled in here (except flags) doesn't
1285          *        change while a STA structure is alive. As such, it should move
1286          *        to between the sta_info_alloc() and sta_info_insert() above.
1287          */
1288
1289         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1290                            WLAN_STA_AUTHORIZED);
1291
1292         rates = 0;
1293         basic_rates = 0;
1294         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1295
1296         for (i = 0; i < elems.supp_rates_len; i++) {
1297                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1298
1299                 if (rate > 110)
1300                         have_higher_than_11mbit = true;
1301
1302                 for (j = 0; j < sband->n_bitrates; j++) {
1303                         if (sband->bitrates[j].bitrate == rate)
1304                                 rates |= BIT(j);
1305                         if (elems.supp_rates[i] & 0x80)
1306                                 basic_rates |= BIT(j);
1307                 }
1308         }
1309
1310         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1311                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1312
1313                 if (rate > 110)
1314                         have_higher_than_11mbit = true;
1315
1316                 for (j = 0; j < sband->n_bitrates; j++) {
1317                         if (sband->bitrates[j].bitrate == rate)
1318                                 rates |= BIT(j);
1319                         if (elems.ext_supp_rates[i] & 0x80)
1320                                 basic_rates |= BIT(j);
1321                 }
1322         }
1323
1324         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1325         sdata->bss_conf.basic_rates = basic_rates;
1326
1327         /* cf. IEEE 802.11 9.2.12 */
1328         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1329             have_higher_than_11mbit)
1330                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1331         else
1332                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1333
1334         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1335             (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1336                 struct ieee80211_ht_bss_info bss_info;
1337                 ieee80211_ht_cap_ie_to_ht_info(
1338                                 elems.ht_cap_elem, &sta->sta.ht_info);
1339                 ieee80211_ht_addt_info_ie_to_ht_bss_info(
1340                                 elems.ht_info_elem, &bss_info);
1341                 ieee80211_handle_ht(local, 1, &sta->sta.ht_info, &bss_info);
1342         }
1343
1344         rate_control_rate_init(sta);
1345
1346         if (elems.wmm_param) {
1347                 set_sta_flags(sta, WLAN_STA_WME);
1348                 rcu_read_unlock();
1349                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1350                                          elems.wmm_param_len);
1351         } else
1352                 rcu_read_unlock();
1353
1354         /* set AID and assoc capability,
1355          * ieee80211_set_associated() will tell the driver */
1356         bss_conf->aid = aid;
1357         bss_conf->assoc_capability = capab_info;
1358         ieee80211_set_associated(sdata, ifsta);
1359
1360         ieee80211_associated(sdata, ifsta);
1361 }
1362
1363
1364 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1365                                    struct ieee80211_if_sta *ifsta,
1366                                    struct ieee80211_bss *bss)
1367 {
1368         struct ieee80211_local *local = sdata->local;
1369         int res, rates, i, j;
1370         struct sk_buff *skb;
1371         struct ieee80211_mgmt *mgmt;
1372         u8 *pos;
1373         struct ieee80211_supported_band *sband;
1374         union iwreq_data wrqu;
1375
1376         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1377
1378         /* Remove possible STA entries from other IBSS networks. */
1379         sta_info_flush_delayed(sdata);
1380
1381         if (local->ops->reset_tsf) {
1382                 /* Reset own TSF to allow time synchronization work. */
1383                 local->ops->reset_tsf(local_to_hw(local));
1384         }
1385         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1386         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1387         if (res)
1388                 return res;
1389
1390         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1391
1392         sdata->drop_unencrypted = bss->capability &
1393                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1394
1395         res = ieee80211_set_freq(sdata, bss->freq);
1396
1397         if (res)
1398                 return res;
1399
1400         /* Build IBSS probe response */
1401         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1402         if (skb) {
1403                 skb_reserve(skb, local->hw.extra_tx_headroom);
1404
1405                 mgmt = (struct ieee80211_mgmt *)
1406                         skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1407                 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1408                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1409                                                   IEEE80211_STYPE_PROBE_RESP);
1410                 memset(mgmt->da, 0xff, ETH_ALEN);
1411                 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1412                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1413                 mgmt->u.beacon.beacon_int =
1414                         cpu_to_le16(local->hw.conf.beacon_int);
1415                 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1416                 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1417
1418                 pos = skb_put(skb, 2 + ifsta->ssid_len);
1419                 *pos++ = WLAN_EID_SSID;
1420                 *pos++ = ifsta->ssid_len;
1421                 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1422
1423                 rates = bss->supp_rates_len;
1424                 if (rates > 8)
1425                         rates = 8;
1426                 pos = skb_put(skb, 2 + rates);
1427                 *pos++ = WLAN_EID_SUPP_RATES;
1428                 *pos++ = rates;
1429                 memcpy(pos, bss->supp_rates, rates);
1430
1431                 if (bss->band == IEEE80211_BAND_2GHZ) {
1432                         pos = skb_put(skb, 2 + 1);
1433                         *pos++ = WLAN_EID_DS_PARAMS;
1434                         *pos++ = 1;
1435                         *pos++ = ieee80211_frequency_to_channel(bss->freq);
1436                 }
1437
1438                 pos = skb_put(skb, 2 + 2);
1439                 *pos++ = WLAN_EID_IBSS_PARAMS;
1440                 *pos++ = 2;
1441                 /* FIX: set ATIM window based on scan results */
1442                 *pos++ = 0;
1443                 *pos++ = 0;
1444
1445                 if (bss->supp_rates_len > 8) {
1446                         rates = bss->supp_rates_len - 8;
1447                         pos = skb_put(skb, 2 + rates);
1448                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
1449                         *pos++ = rates;
1450                         memcpy(pos, &bss->supp_rates[8], rates);
1451                 }
1452
1453                 ifsta->probe_resp = skb;
1454
1455                 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1456         }
1457
1458         rates = 0;
1459         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1460         for (i = 0; i < bss->supp_rates_len; i++) {
1461                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1462                 for (j = 0; j < sband->n_bitrates; j++)
1463                         if (sband->bitrates[j].bitrate == bitrate)
1464                                 rates |= BIT(j);
1465         }
1466         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1467
1468         ieee80211_sta_def_wmm_params(sdata, bss);
1469
1470         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1471         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1472
1473         ieee80211_led_assoc(local, true);
1474
1475         memset(&wrqu, 0, sizeof(wrqu));
1476         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1477         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1478
1479         return res;
1480 }
1481
1482 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1483                                   struct ieee80211_mgmt *mgmt,
1484                                   size_t len,
1485                                   struct ieee80211_rx_status *rx_status,
1486                                   struct ieee802_11_elems *elems,
1487                                   bool beacon)
1488 {
1489         struct ieee80211_local *local = sdata->local;
1490         int freq;
1491         struct ieee80211_bss *bss;
1492         struct sta_info *sta;
1493         struct ieee80211_channel *channel;
1494         u64 beacon_timestamp, rx_timestamp;
1495         u64 supp_rates = 0;
1496         enum ieee80211_band band = rx_status->band;
1497
1498         if (elems->ds_params && elems->ds_params_len == 1)
1499                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1500         else
1501                 freq = rx_status->freq;
1502
1503         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1504
1505         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1506                 return;
1507
1508         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1509             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1510                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1511
1512                 rcu_read_lock();
1513
1514                 sta = sta_info_get(local, mgmt->sa);
1515                 if (sta) {
1516                         u64 prev_rates;
1517
1518                         prev_rates = sta->sta.supp_rates[band];
1519                         /* make sure mandatory rates are always added */
1520                         sta->sta.supp_rates[band] = supp_rates |
1521                                 ieee80211_mandatory_rates(local, band);
1522
1523 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1524                         if (sta->sta.supp_rates[band] != prev_rates)
1525                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1526                                     "for %pM based on beacon info (0x%llx | "
1527                                     "0x%llx -> 0x%llx)\n",
1528                                     sdata->dev->name,
1529                                     sta->sta.addr,
1530                                     (unsigned long long) prev_rates,
1531                                     (unsigned long long) supp_rates,
1532                                     (unsigned long long) sta->sta.supp_rates[band]);
1533 #endif
1534                 } else {
1535                         ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
1536                                                mgmt->sa, supp_rates);
1537                 }
1538
1539                 rcu_read_unlock();
1540         }
1541
1542         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1543                                         freq, beacon);
1544         if (!bss)
1545                 return;
1546
1547         /* was just updated in ieee80211_bss_info_update */
1548         beacon_timestamp = bss->timestamp;
1549
1550         /*
1551          * In STA mode, the remaining parameters should not be overridden
1552          * by beacons because they're not necessarily accurate there.
1553          */
1554         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1555             bss->last_probe_resp && beacon) {
1556                 ieee80211_rx_bss_put(local, bss);
1557                 return;
1558         }
1559
1560         /* check if we need to merge IBSS */
1561         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1562             bss->capability & WLAN_CAPABILITY_IBSS &&
1563             bss->freq == local->oper_channel->center_freq &&
1564             elems->ssid_len == sdata->u.sta.ssid_len &&
1565             memcmp(elems->ssid, sdata->u.sta.ssid,
1566                                 sdata->u.sta.ssid_len) == 0) {
1567                 if (rx_status->flag & RX_FLAG_TSFT) {
1568                         /* in order for correct IBSS merging we need mactime
1569                          *
1570                          * since mactime is defined as the time the first data
1571                          * symbol of the frame hits the PHY, and the timestamp
1572                          * of the beacon is defined as "the time that the data
1573                          * symbol containing the first bit of the timestamp is
1574                          * transmitted to the PHY plus the transmitting STA’s
1575                          * delays through its local PHY from the MAC-PHY
1576                          * interface to its interface with the WM"
1577                          * (802.11 11.1.2) - equals the time this bit arrives at
1578                          * the receiver - we have to take into account the
1579                          * offset between the two.
1580                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1581                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1582                          */
1583                         int rate = local->hw.wiphy->bands[band]->
1584                                         bitrates[rx_status->rate_idx].bitrate;
1585                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1586                 } else if (local && local->ops && local->ops->get_tsf)
1587                         /* second best option: get current TSF */
1588                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1589                 else
1590                         /* can't merge without knowing the TSF */
1591                         rx_timestamp = -1LLU;
1592 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1593                 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1594                        "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1595                        mgmt->sa, mgmt->bssid,
1596                        (unsigned long long)rx_timestamp,
1597                        (unsigned long long)beacon_timestamp,
1598                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1599                        jiffies);
1600 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1601                 if (beacon_timestamp > rx_timestamp) {
1602 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1603                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1604                                "local TSF - IBSS merge with BSSID %pM\n",
1605                                sdata->dev->name, mgmt->bssid);
1606 #endif
1607                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1608                         ieee80211_ibss_add_sta(sdata, NULL,
1609                                                mgmt->bssid, mgmt->sa,
1610                                                supp_rates);
1611                 }
1612         }
1613
1614         ieee80211_rx_bss_put(local, bss);
1615 }
1616
1617
1618 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1619                                          struct ieee80211_mgmt *mgmt,
1620                                          size_t len,
1621                                          struct ieee80211_rx_status *rx_status)
1622 {
1623         size_t baselen;
1624         struct ieee802_11_elems elems;
1625         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1626
1627         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1628                 return; /* ignore ProbeResp to foreign address */
1629
1630         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1631         if (baselen > len)
1632                 return;
1633
1634         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1635                                 &elems);
1636
1637         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1638
1639         /* direct probe may be part of the association flow */
1640         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1641                                                         &ifsta->request)) {
1642                 printk(KERN_DEBUG "%s direct probe responded\n",
1643                        sdata->dev->name);
1644                 ieee80211_authenticate(sdata, ifsta);
1645         }
1646 }
1647
1648
1649 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1650                                      struct ieee80211_mgmt *mgmt,
1651                                      size_t len,
1652                                      struct ieee80211_rx_status *rx_status)
1653 {
1654         struct ieee80211_if_sta *ifsta;
1655         size_t baselen;
1656         struct ieee802_11_elems elems;
1657         struct ieee80211_local *local = sdata->local;
1658         struct ieee80211_conf *conf = &local->hw.conf;
1659         u32 changed = 0;
1660
1661         /* Process beacon from the current BSS */
1662         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1663         if (baselen > len)
1664                 return;
1665
1666         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1667
1668         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1669
1670         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1671                 return;
1672         ifsta = &sdata->u.sta;
1673
1674         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1675             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1676                 return;
1677
1678         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1679                                  elems.wmm_param_len);
1680
1681         if (elems.erp_info && elems.erp_info_len >= 1)
1682                 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
1683         else {
1684                 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
1685                 changed |= ieee80211_handle_protect_preamb(sdata, false,
1686                                 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
1687         }
1688
1689         if (elems.ht_cap_elem && elems.ht_info_elem &&
1690             elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
1691                 struct ieee80211_ht_bss_info bss_info;
1692
1693                 ieee80211_ht_addt_info_ie_to_ht_bss_info(
1694                                 elems.ht_info_elem, &bss_info);
1695                 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
1696                                                &bss_info);
1697         }
1698
1699         ieee80211_bss_info_change_notify(sdata, changed);
1700 }
1701
1702
1703 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1704                                         struct ieee80211_if_sta *ifsta,
1705                                         struct ieee80211_mgmt *mgmt,
1706                                         size_t len,
1707                                         struct ieee80211_rx_status *rx_status)
1708 {
1709         struct ieee80211_local *local = sdata->local;
1710         int tx_last_beacon;
1711         struct sk_buff *skb;
1712         struct ieee80211_mgmt *resp;
1713         u8 *pos, *end;
1714
1715         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1716             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1717             len < 24 + 2 || !ifsta->probe_resp)
1718                 return;
1719
1720         if (local->ops->tx_last_beacon)
1721                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1722         else
1723                 tx_last_beacon = 1;
1724
1725 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1726         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1727                " (tx_last_beacon=%d)\n",
1728                sdata->dev->name, mgmt->sa, mgmt->da,
1729                mgmt->bssid, tx_last_beacon);
1730 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1731
1732         if (!tx_last_beacon)
1733                 return;
1734
1735         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1736             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1737                 return;
1738
1739         end = ((u8 *) mgmt) + len;
1740         pos = mgmt->u.probe_req.variable;
1741         if (pos[0] != WLAN_EID_SSID ||
1742             pos + 2 + pos[1] > end) {
1743 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1744                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1745                        "from %pM\n",
1746                        sdata->dev->name, mgmt->sa);
1747 #endif
1748                 return;
1749         }
1750         if (pos[1] != 0 &&
1751             (pos[1] != ifsta->ssid_len ||
1752              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1753                 /* Ignore ProbeReq for foreign SSID */
1754                 return;
1755         }
1756
1757         /* Reply with ProbeResp */
1758         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1759         if (!skb)
1760                 return;
1761
1762         resp = (struct ieee80211_mgmt *) skb->data;
1763         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1764 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1765         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1766                sdata->dev->name, resp->da);
1767 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1768         ieee80211_tx_skb(sdata, skb, 0);
1769 }
1770
1771 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1772                            struct ieee80211_rx_status *rx_status)
1773 {
1774         struct ieee80211_local *local = sdata->local;
1775         struct ieee80211_if_sta *ifsta;
1776         struct ieee80211_mgmt *mgmt;
1777         u16 fc;
1778
1779         if (skb->len < 24)
1780                 goto fail;
1781
1782         ifsta = &sdata->u.sta;
1783
1784         mgmt = (struct ieee80211_mgmt *) skb->data;
1785         fc = le16_to_cpu(mgmt->frame_control);
1786
1787         switch (fc & IEEE80211_FCTL_STYPE) {
1788         case IEEE80211_STYPE_PROBE_REQ:
1789         case IEEE80211_STYPE_PROBE_RESP:
1790         case IEEE80211_STYPE_BEACON:
1791                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1792         case IEEE80211_STYPE_AUTH:
1793         case IEEE80211_STYPE_ASSOC_RESP:
1794         case IEEE80211_STYPE_REASSOC_RESP:
1795         case IEEE80211_STYPE_DEAUTH:
1796         case IEEE80211_STYPE_DISASSOC:
1797                 skb_queue_tail(&ifsta->skb_queue, skb);
1798                 queue_work(local->hw.workqueue, &ifsta->work);
1799                 return;
1800         }
1801
1802  fail:
1803         kfree_skb(skb);
1804 }
1805
1806 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1807                                          struct sk_buff *skb)
1808 {
1809         struct ieee80211_rx_status *rx_status;
1810         struct ieee80211_if_sta *ifsta;
1811         struct ieee80211_mgmt *mgmt;
1812         u16 fc;
1813
1814         ifsta = &sdata->u.sta;
1815
1816         rx_status = (struct ieee80211_rx_status *) skb->cb;
1817         mgmt = (struct ieee80211_mgmt *) skb->data;
1818         fc = le16_to_cpu(mgmt->frame_control);
1819
1820         switch (fc & IEEE80211_FCTL_STYPE) {
1821         case IEEE80211_STYPE_PROBE_REQ:
1822                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1823                                             rx_status);
1824                 break;
1825         case IEEE80211_STYPE_PROBE_RESP:
1826                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1827                 break;
1828         case IEEE80211_STYPE_BEACON:
1829                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1830                 break;
1831         case IEEE80211_STYPE_AUTH:
1832                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1833                 break;
1834         case IEEE80211_STYPE_ASSOC_RESP:
1835                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1836                 break;
1837         case IEEE80211_STYPE_REASSOC_RESP:
1838                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1839                 break;
1840         case IEEE80211_STYPE_DEAUTH:
1841                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1842                 break;
1843         case IEEE80211_STYPE_DISASSOC:
1844                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1845                 break;
1846         }
1847
1848         kfree_skb(skb);
1849 }
1850
1851
1852 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1853 {
1854         struct ieee80211_local *local = sdata->local;
1855         int active = 0;
1856         struct sta_info *sta;
1857
1858         rcu_read_lock();
1859
1860         list_for_each_entry_rcu(sta, &local->sta_list, list) {
1861                 if (sta->sdata == sdata &&
1862                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1863                                jiffies)) {
1864                         active++;
1865                         break;
1866                 }
1867         }
1868
1869         rcu_read_unlock();
1870
1871         return active;
1872 }
1873
1874
1875 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1876                                      struct ieee80211_if_sta *ifsta)
1877 {
1878         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1879
1880         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1881         if (ieee80211_sta_active_ibss(sdata))
1882                 return;
1883
1884         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1885                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1886         ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1887 }
1888
1889
1890 static void ieee80211_sta_timer(unsigned long data)
1891 {
1892         struct ieee80211_sub_if_data *sdata =
1893                 (struct ieee80211_sub_if_data *) data;
1894         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1895         struct ieee80211_local *local = sdata->local;
1896
1897         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1898         queue_work(local->hw.workqueue, &ifsta->work);
1899 }
1900
1901 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1902                                      struct ieee80211_if_sta *ifsta)
1903 {
1904         struct ieee80211_local *local = sdata->local;
1905
1906         if (local->ops->reset_tsf) {
1907                 /* Reset own TSF to allow time synchronization work. */
1908                 local->ops->reset_tsf(local_to_hw(local));
1909         }
1910
1911         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1912
1913
1914         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1915                 ifsta->auth_alg = WLAN_AUTH_OPEN;
1916         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1917                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1918         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1919                 ifsta->auth_alg = WLAN_AUTH_LEAP;
1920         else
1921                 ifsta->auth_alg = WLAN_AUTH_OPEN;
1922         ifsta->auth_transaction = -1;
1923         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1924         ifsta->assoc_scan_tries = 0;
1925         ifsta->direct_probe_tries = 0;
1926         ifsta->auth_tries = 0;
1927         ifsta->assoc_tries = 0;
1928         netif_tx_stop_all_queues(sdata->dev);
1929         netif_carrier_off(sdata->dev);
1930 }
1931
1932
1933 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
1934                                     const char *ssid, int ssid_len)
1935 {
1936         int tmp, hidden_ssid;
1937
1938         if (ssid_len == ifsta->ssid_len &&
1939             !memcmp(ifsta->ssid, ssid, ssid_len))
1940                 return 1;
1941
1942         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1943                 return 0;
1944
1945         hidden_ssid = 1;
1946         tmp = ssid_len;
1947         while (tmp--) {
1948                 if (ssid[tmp] != '\0') {
1949                         hidden_ssid = 0;
1950                         break;
1951                 }
1952         }
1953
1954         if (hidden_ssid && ifsta->ssid_len == ssid_len)
1955                 return 1;
1956
1957         if (ssid_len == 1 && ssid[0] == ' ')
1958                 return 1;
1959
1960         return 0;
1961 }
1962
1963 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
1964                                      struct ieee80211_if_sta *ifsta)
1965 {
1966         struct ieee80211_local *local = sdata->local;
1967         struct ieee80211_bss *bss;
1968         struct ieee80211_supported_band *sband;
1969         u8 bssid[ETH_ALEN], *pos;
1970         int i;
1971         int ret;
1972
1973 #if 0
1974         /* Easier testing, use fixed BSSID. */
1975         memset(bssid, 0xfe, ETH_ALEN);
1976 #else
1977         /* Generate random, not broadcast, locally administered BSSID. Mix in
1978          * own MAC address to make sure that devices that do not have proper
1979          * random number generator get different BSSID. */
1980         get_random_bytes(bssid, ETH_ALEN);
1981         for (i = 0; i < ETH_ALEN; i++)
1982                 bssid[i] ^= sdata->dev->dev_addr[i];
1983         bssid[0] &= ~0x01;
1984         bssid[0] |= 0x02;
1985 #endif
1986
1987         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
1988                sdata->dev->name, bssid);
1989
1990         bss = ieee80211_rx_bss_add(local, bssid,
1991                                    local->hw.conf.channel->center_freq,
1992                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
1993         if (!bss)
1994                 return -ENOMEM;
1995
1996         bss->band = local->hw.conf.channel->band;
1997         sband = local->hw.wiphy->bands[bss->band];
1998
1999         if (local->hw.conf.beacon_int == 0)
2000                 local->hw.conf.beacon_int = 100;
2001         bss->beacon_int = local->hw.conf.beacon_int;
2002         bss->last_update = jiffies;
2003         bss->capability = WLAN_CAPABILITY_IBSS;
2004
2005         if (sdata->default_key)
2006                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2007         else
2008                 sdata->drop_unencrypted = 0;
2009
2010         bss->supp_rates_len = sband->n_bitrates;
2011         pos = bss->supp_rates;
2012         for (i = 0; i < sband->n_bitrates; i++) {
2013                 int rate = sband->bitrates[i].bitrate;
2014                 *pos++ = (u8) (rate / 5);
2015         }
2016
2017         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2018         ieee80211_rx_bss_put(local, bss);
2019         return ret;
2020 }
2021
2022
2023 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2024                                    struct ieee80211_if_sta *ifsta)
2025 {
2026         struct ieee80211_local *local = sdata->local;
2027         struct ieee80211_bss *bss;
2028         int found = 0;
2029         u8 bssid[ETH_ALEN];
2030         int active_ibss;
2031
2032         if (ifsta->ssid_len == 0)
2033                 return -EINVAL;
2034
2035         active_ibss = ieee80211_sta_active_ibss(sdata);
2036 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2037         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2038                sdata->dev->name, active_ibss);
2039 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2040         spin_lock_bh(&local->bss_lock);
2041         list_for_each_entry(bss, &local->bss_list, list) {
2042                 if (ifsta->ssid_len != bss->ssid_len ||
2043                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2044                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2045                         continue;
2046 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2047                 printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
2048 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2049                 memcpy(bssid, bss->bssid, ETH_ALEN);
2050                 found = 1;
2051                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2052                         break;
2053         }
2054         spin_unlock_bh(&local->bss_lock);
2055
2056 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2057         if (found)
2058                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2059                        "%pM\n", bssid, ifsta->bssid);
2060 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2061
2062         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2063                 int ret;
2064                 int search_freq;
2065
2066                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2067                         search_freq = bss->freq;
2068                 else
2069                         search_freq = local->hw.conf.channel->center_freq;
2070
2071                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2072                                            ifsta->ssid, ifsta->ssid_len);
2073                 if (!bss)
2074                         goto dont_join;
2075
2076                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2077                        " based on configured SSID\n",
2078                        sdata->dev->name, bssid);
2079                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2080                 ieee80211_rx_bss_put(local, bss);
2081                 return ret;
2082         }
2083
2084 dont_join:
2085 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2086         printk(KERN_DEBUG "   did not try to join ibss\n");
2087 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2088
2089         /* Selected IBSS not found in current scan results - try to scan */
2090         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2091             !ieee80211_sta_active_ibss(sdata)) {
2092                 mod_timer(&ifsta->timer, jiffies +
2093                                       IEEE80211_IBSS_MERGE_INTERVAL);
2094         } else if (time_after(jiffies, local->last_scan_completed +
2095                               IEEE80211_SCAN_INTERVAL)) {
2096                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2097                        "join\n", sdata->dev->name);
2098                 return ieee80211_request_scan(sdata, ifsta->ssid,
2099                                               ifsta->ssid_len);
2100         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2101                 int interval = IEEE80211_SCAN_INTERVAL;
2102
2103                 if (time_after(jiffies, ifsta->ibss_join_req +
2104                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2105                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2106                             (!(local->oper_channel->flags &
2107                                         IEEE80211_CHAN_NO_IBSS)))
2108                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2109                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2110                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2111                                        " %d MHz\n", sdata->dev->name,
2112                                        local->hw.conf.channel->center_freq);
2113                         }
2114
2115                         /* No IBSS found - decrease scan interval and continue
2116                          * scanning. */
2117                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2118                 }
2119
2120                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2121                 mod_timer(&ifsta->timer, jiffies + interval);
2122                 return 0;
2123         }
2124
2125         return 0;
2126 }
2127
2128
2129 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2130                                      struct ieee80211_if_sta *ifsta)
2131 {
2132         struct ieee80211_local *local = sdata->local;
2133         struct ieee80211_bss *bss, *selected = NULL;
2134         int top_rssi = 0, freq;
2135
2136         spin_lock_bh(&local->bss_lock);
2137         freq = local->oper_channel->center_freq;
2138         list_for_each_entry(bss, &local->bss_list, list) {
2139                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2140                         continue;
2141
2142                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2143                         IEEE80211_STA_AUTO_BSSID_SEL |
2144                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2145                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2146                      !!sdata->default_key))
2147                         continue;
2148
2149                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2150                     bss->freq != freq)
2151                         continue;
2152
2153                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2154                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2155                         continue;
2156
2157                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2158                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2159                         continue;
2160
2161                 if (!selected || top_rssi < bss->signal) {
2162                         selected = bss;
2163                         top_rssi = bss->signal;
2164                 }
2165         }
2166         if (selected)
2167                 atomic_inc(&selected->users);
2168         spin_unlock_bh(&local->bss_lock);
2169
2170         if (selected) {
2171                 ieee80211_set_freq(sdata, selected->freq);
2172                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2173                         ieee80211_sta_set_ssid(sdata, selected->ssid,
2174                                                selected->ssid_len);
2175                 ieee80211_sta_set_bssid(sdata, selected->bssid);
2176                 ieee80211_sta_def_wmm_params(sdata, selected);
2177
2178                 /* Send out direct probe if no probe resp was received or
2179                  * the one we have is outdated
2180                  */
2181                 if (!selected->last_probe_resp ||
2182                     time_after(jiffies, selected->last_probe_resp
2183                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2184                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2185                 else
2186                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2187
2188                 ieee80211_rx_bss_put(local, selected);
2189                 ieee80211_sta_reset_auth(sdata, ifsta);
2190                 return 0;
2191         } else {
2192                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2193                         ifsta->assoc_scan_tries++;
2194                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2195                                 ieee80211_start_scan(sdata, NULL, 0);
2196                         else
2197                                 ieee80211_start_scan(sdata, ifsta->ssid,
2198                                                          ifsta->ssid_len);
2199                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2200                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2201                 } else
2202                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2203         }
2204         return -1;
2205 }
2206
2207
2208 static void ieee80211_sta_work(struct work_struct *work)
2209 {
2210         struct ieee80211_sub_if_data *sdata =
2211                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2212         struct ieee80211_local *local = sdata->local;
2213         struct ieee80211_if_sta *ifsta;
2214         struct sk_buff *skb;
2215
2216         if (!netif_running(sdata->dev))
2217                 return;
2218
2219         if (local->sw_scanning || local->hw_scanning)
2220                 return;
2221
2222         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2223                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2224                 return;
2225         ifsta = &sdata->u.sta;
2226
2227         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2228                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2229
2230         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2231             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2232             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2233             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2234                 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2235                                      ifsta->scan_ssid_len);
2236                 return;
2237         }
2238
2239         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2240                 if (ieee80211_sta_config_auth(sdata, ifsta))
2241                         return;
2242                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2243         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2244                 return;
2245
2246         switch (ifsta->state) {
2247         case IEEE80211_STA_MLME_DISABLED:
2248                 break;
2249         case IEEE80211_STA_MLME_DIRECT_PROBE:
2250                 ieee80211_direct_probe(sdata, ifsta);
2251                 break;
2252         case IEEE80211_STA_MLME_AUTHENTICATE:
2253                 ieee80211_authenticate(sdata, ifsta);
2254                 break;
2255         case IEEE80211_STA_MLME_ASSOCIATE:
2256                 ieee80211_associate(sdata, ifsta);
2257                 break;
2258         case IEEE80211_STA_MLME_ASSOCIATED:
2259                 ieee80211_associated(sdata, ifsta);
2260                 break;
2261         case IEEE80211_STA_MLME_IBSS_SEARCH:
2262                 ieee80211_sta_find_ibss(sdata, ifsta);
2263                 break;
2264         case IEEE80211_STA_MLME_IBSS_JOINED:
2265                 ieee80211_sta_merge_ibss(sdata, ifsta);
2266                 break;
2267         default:
2268                 WARN_ON(1);
2269                 break;
2270         }
2271
2272         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2273                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2274                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2275
2276                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2277                                         WLAN_REASON_UNSPECIFIED);
2278         }
2279 }
2280
2281 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2282 {
2283         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2284                 queue_work(sdata->local->hw.workqueue,
2285                            &sdata->u.sta.work);
2286 }
2287
2288 /* interface setup */
2289 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2290 {
2291         struct ieee80211_if_sta *ifsta;
2292
2293         ifsta = &sdata->u.sta;
2294         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2295         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2296                     (unsigned long) sdata);
2297         skb_queue_head_init(&ifsta->skb_queue);
2298
2299         ifsta->capab = WLAN_CAPABILITY_ESS;
2300         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2301                 IEEE80211_AUTH_ALG_SHARED_KEY;
2302         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2303                 IEEE80211_STA_AUTO_BSSID_SEL |
2304                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2305         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2306                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2307 }
2308
2309 /*
2310  * Add a new IBSS station, will also be called by the RX code when,
2311  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2312  * must be callable in atomic context.
2313  */
2314 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2315                                         struct sk_buff *skb, u8 *bssid,
2316                                         u8 *addr, u64 supp_rates)
2317 {
2318         struct ieee80211_local *local = sdata->local;
2319         struct sta_info *sta;
2320         int band = local->hw.conf.channel->band;
2321
2322         /* TODO: Could consider removing the least recently used entry and
2323          * allow new one to be added. */
2324         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2325                 if (net_ratelimit()) {
2326                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2327                                "entry %pM\n", sdata->dev->name, addr);
2328                 }
2329                 return NULL;
2330         }
2331
2332         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2333                 return NULL;
2334
2335 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2336         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2337                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2338 #endif
2339
2340         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2341         if (!sta)
2342                 return NULL;
2343
2344         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2345
2346         /* make sure mandatory rates are always added */
2347         sta->sta.supp_rates[band] = supp_rates |
2348                         ieee80211_mandatory_rates(local, band);
2349
2350         rate_control_rate_init(sta);
2351
2352         if (sta_info_insert(sta))
2353                 return NULL;
2354
2355         return sta;
2356 }
2357
2358 /* configuration hooks */
2359 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2360                             struct ieee80211_if_sta *ifsta)
2361 {
2362         struct ieee80211_local *local = sdata->local;
2363
2364         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2365                 return;
2366
2367         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2368                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2369             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2370                              IEEE80211_STA_AUTO_SSID_SEL))) {
2371
2372                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2373                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2374                                                WLAN_REASON_DEAUTH_LEAVING);
2375
2376                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2377                 queue_work(local->hw.workqueue, &ifsta->work);
2378         }
2379 }
2380
2381 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2382 {
2383         struct ieee80211_if_sta *ifsta;
2384         int res;
2385
2386         if (len > IEEE80211_MAX_SSID_LEN)
2387                 return -EINVAL;
2388
2389         ifsta = &sdata->u.sta;
2390
2391         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2392                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2393                 memcpy(ifsta->ssid, ssid, len);
2394                 ifsta->ssid_len = len;
2395                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2396
2397                 res = 0;
2398                 /*
2399                  * Hack! MLME code needs to be cleaned up to have different
2400                  * entry points for configuration and internal selection change
2401                  */
2402                 if (netif_running(sdata->dev))
2403                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
2404                 if (res) {
2405                         printk(KERN_DEBUG "%s: Failed to config new SSID to "
2406                                "the low-level driver\n", sdata->dev->name);
2407                         return res;
2408                 }
2409         }
2410
2411         if (len)
2412                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2413         else
2414                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2415
2416         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2417             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2418                 ifsta->ibss_join_req = jiffies;
2419                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2420                 return ieee80211_sta_find_ibss(sdata, ifsta);
2421         }
2422
2423         return 0;
2424 }
2425
2426 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2427 {
2428         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2429         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2430         *len = ifsta->ssid_len;
2431         return 0;
2432 }
2433
2434 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2435 {
2436         struct ieee80211_if_sta *ifsta;
2437         int res;
2438
2439         ifsta = &sdata->u.sta;
2440
2441         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2442                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2443                 res = 0;
2444                 /*
2445                  * Hack! See also ieee80211_sta_set_ssid.
2446                  */
2447                 if (netif_running(sdata->dev))
2448                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2449                 if (res) {
2450                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2451                                "the low-level driver\n", sdata->dev->name);
2452                         return res;
2453                 }
2454         }
2455
2456         if (is_valid_ether_addr(bssid))
2457                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2458         else
2459                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2460
2461         return 0;
2462 }
2463
2464 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2465 {
2466         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2467
2468         kfree(ifsta->extra_ie);
2469         if (len == 0) {
2470                 ifsta->extra_ie = NULL;
2471                 ifsta->extra_ie_len = 0;
2472                 return 0;
2473         }
2474         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2475         if (!ifsta->extra_ie) {
2476                 ifsta->extra_ie_len = 0;
2477                 return -ENOMEM;
2478         }
2479         memcpy(ifsta->extra_ie, ie, len);
2480         ifsta->extra_ie_len = len;
2481         return 0;
2482 }
2483
2484 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2485 {
2486         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2487
2488         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2489                sdata->dev->name, reason);
2490
2491         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2492             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2493                 return -EINVAL;
2494
2495         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2496         return 0;
2497 }
2498
2499 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2500 {
2501         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2502
2503         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2504                sdata->dev->name, reason);
2505
2506         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2507                 return -EINVAL;
2508
2509         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2510                 return -1;
2511
2512         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2513         return 0;
2514 }
2515
2516 /* scan finished notification */
2517 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2518 {
2519         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2520         struct ieee80211_if_sta *ifsta;
2521
2522         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2523                 ifsta = &sdata->u.sta;
2524                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2525                     (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2526                     !ieee80211_sta_active_ibss(sdata)))
2527                         ieee80211_sta_find_ibss(sdata, ifsta);
2528         }
2529
2530         /* Restart STA timers */
2531         rcu_read_lock();
2532         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2533                 ieee80211_restart_sta_timer(sdata);
2534         rcu_read_unlock();
2535 }
2536
2537 /* driver notification call */
2538 void ieee80211_notify_mac(struct ieee80211_hw *hw,
2539                           enum ieee80211_notification_types  notif_type)
2540 {
2541         struct ieee80211_local *local = hw_to_local(hw);
2542         struct ieee80211_sub_if_data *sdata;
2543
2544         switch (notif_type) {
2545         case IEEE80211_NOTIFY_RE_ASSOC:
2546                 rcu_read_lock();
2547                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2548                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2549                                 continue;
2550
2551                         ieee80211_sta_req_auth(sdata, &sdata->u.sta);
2552                 }
2553                 rcu_read_unlock();
2554                 break;
2555         }
2556 }
2557 EXPORT_SYMBOL(ieee80211_notify_mac);