net/mac80211/ieee80211_sta.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 /* TODO:
  15  * order BSS list by RSSI(?) ("quality of AP")
  16  * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
  17  *    SSID)
  18  */
  19 #include <linux/delay.h>
  20 #include <linux/if_ether.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/if_arp.h>
  24 #include <linux/wireless.h>
  25 #include <linux/random.h>
  26 #include <linux/etherdevice.h>
  27 #include <net/iw_handler.h>
  28 #include <asm/types.h>
  29
  30 #include <net/mac80211.h>
  31 #include "ieee80211_i.h"
  32 #include "ieee80211_rate.h"
  33 #include "ieee80211_led.h"
  34
  35 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  36 #define IEEE80211_AUTH_MAX_TRIES 3
  37 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  38 #define IEEE80211_ASSOC_MAX_TRIES 3
  39 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  40 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  41 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  42 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  43 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  44 #define IEEE80211_IBSS_JOIN_TIMEOUT (20 * HZ)
  45
  46 #define IEEE80211_PROBE_DELAY (HZ / 33)
  47 #define IEEE80211_CHANNEL_TIME (HZ / 33)
  48 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
  49 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
  50 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  51 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  52
  53 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  54
  55
  56 #define IEEE80211_FC(type, stype) cpu_to_le16(type | stype)
  57
  58 #define ERP_INFO_USE_PROTECTION BIT(1)
  59
  60 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
  61                                      u8 *ssid, size_t ssid_len);
  62 static struct ieee80211_sta_bss *
  63 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel,
  64                      u8 *ssid, u8 ssid_len);
  65 static void ieee80211_rx_bss_put(struct net_device *dev,
  66                                  struct ieee80211_sta_bss *bss);
  67 static int ieee80211_sta_find_ibss(struct net_device *dev,
  68                                    struct ieee80211_if_sta *ifsta);
  69 static int ieee80211_sta_wep_configured(struct net_device *dev);
  70 static int ieee80211_sta_start_scan(struct net_device *dev,
  71                                     u8 *ssid, size_t ssid_len);
  72 static int ieee80211_sta_config_auth(struct net_device *dev,
  73                                      struct ieee80211_if_sta *ifsta);
  74
  75
  76 /* Parsed Information Elements */
  77 struct ieee802_11_elems {
  78         /* pointers to IEs */
  79         u8 *ssid;
  80         u8 *supp_rates;
  81         u8 *fh_params;
  82         u8 *ds_params;
  83         u8 *cf_params;
  84         u8 *tim;
  85         u8 *ibss_params;
  86         u8 *challenge;
  87         u8 *wpa;
  88         u8 *rsn;
  89         u8 *erp_info;
  90         u8 *ext_supp_rates;
  91         u8 *wmm_info;
  92         u8 *wmm_param;
  93
  94         /* length of them, respectively */
  95         u8 ssid_len;
  96         u8 supp_rates_len;
  97         u8 fh_params_len;
  98         u8 ds_params_len;
  99         u8 cf_params_len;
 100         u8 tim_len;
 101         u8 ibss_params_len;
 102         u8 challenge_len;
 103         u8 wpa_len;
 104         u8 rsn_len;
 105         u8 erp_info_len;
 106         u8 ext_supp_rates_len;
 107         u8 wmm_info_len;
 108         u8 wmm_param_len;
 109 };
 110
 111 static void ieee802_11_parse_elems(u8 *start, size_t len,
 112                                    struct ieee802_11_elems *elems)
 113 {
 114         size_t left = len;
 115         u8 *pos = start;
 116
 117         memset(elems, 0, sizeof(*elems));
 118
 119         while (left >= 2) {
 120                 u8 id, elen;
 121
 122                 id = *pos++;
 123                 elen = *pos++;
 124                 left -= 2;
 125
 126                 if (elen > left)
 127                         return;
 128
 129                 switch (id) {
 130                 case WLAN_EID_SSID:
 131                         elems->ssid = pos;
 132                         elems->ssid_len = elen;
 133                         break;
 134                 case WLAN_EID_SUPP_RATES:
 135                         elems->supp_rates = pos;
 136                         elems->supp_rates_len = elen;
 137                         break;
 138                 case WLAN_EID_FH_PARAMS:
 139                         elems->fh_params = pos;
 140                         elems->fh_params_len = elen;
 141                         break;
 142                 case WLAN_EID_DS_PARAMS:
 143                         elems->ds_params = pos;
 144                         elems->ds_params_len = elen;
 145                         break;
 146                 case WLAN_EID_CF_PARAMS:
 147                         elems->cf_params = pos;
 148                         elems->cf_params_len = elen;
 149                         break;
 150                 case WLAN_EID_TIM:
 151                         elems->tim = pos;
 152                         elems->tim_len = elen;
 153                         break;
 154                 case WLAN_EID_IBSS_PARAMS:
 155                         elems->ibss_params = pos;
 156                         elems->ibss_params_len = elen;
 157                         break;
 158                 case WLAN_EID_CHALLENGE:
 159                         elems->challenge = pos;
 160                         elems->challenge_len = elen;
 161                         break;
 162                 case WLAN_EID_WPA:
 163                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 164                             pos[2] == 0xf2) {
 165                                 /* Microsoft OUI (00:50:F2) */
 166                                 if (pos[3] == 1) {
 167                                         /* OUI Type 1 - WPA IE */
 168                                         elems->wpa = pos;
 169                                         elems->wpa_len = elen;
 170                                 } else if (elen >= 5 && pos[3] == 2) {
 171                                         if (pos[4] == 0) {
 172                                                 elems->wmm_info = pos;
 173                                                 elems->wmm_info_len = elen;
 174                                         } else if (pos[4] == 1) {
 175                                                 elems->wmm_param = pos;
 176                                                 elems->wmm_param_len = elen;
 177                                         }
 178                                 }
 179                         }
 180                         break;
 181                 case WLAN_EID_RSN:
 182                         elems->rsn = pos;
 183                         elems->rsn_len = elen;
 184                         break;
 185                 case WLAN_EID_ERP_INFO:
 186                         elems->erp_info = pos;
 187                         elems->erp_info_len = elen;
 188                         break;
 189                 case WLAN_EID_EXT_SUPP_RATES:
 190                         elems->ext_supp_rates = pos;
 191                         elems->ext_supp_rates_len = elen;
 192                         break;
 193                 default:
 194                         break;
 195                 }
 196
 197                 left -= elen;
 198                 pos += elen;
 199         }
 200 }
 201
 202
 203 static int ecw2cw(int ecw)
 204 {
 205         int cw = 1;
 206         while (ecw > 0) {
 207                 cw <<= 1;
 208                 ecw--;
 209         }
 210         return cw - 1;
 211 }
 212
 213 static void ieee80211_sta_wmm_params(struct net_device *dev,
 214                                      struct ieee80211_if_sta *ifsta,
 215                                      u8 *wmm_param, size_t wmm_param_len)
 216 {
 217         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 218         struct ieee80211_tx_queue_params params;
 219         size_t left;
 220         int count;
 221         u8 *pos;
 222
 223         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 224                 return;
 225         count = wmm_param[6] & 0x0f;
 226         if (count == ifsta->wmm_last_param_set)
 227                 return;
 228         ifsta->wmm_last_param_set = count;
 229
 230         pos = wmm_param + 8;
 231         left = wmm_param_len - 8;
 232
 233         memset(&params, 0, sizeof(params));
 234
 235         if (!local->ops->conf_tx)
 236                 return;
 237
 238         local->wmm_acm = 0;
 239         for (; left >= 4; left -= 4, pos += 4) {
 240                 int aci = (pos[0] >> 5) & 0x03;
 241                 int acm = (pos[0] >> 4) & 0x01;
 242                 int queue;
 243
 244                 switch (aci) {
 245                 case 1:
 246                         queue = IEEE80211_TX_QUEUE_DATA3;
 247                         if (acm) {
 248                                 local->wmm_acm |= BIT(0) | BIT(3);
 249                         }
 250                         break;
 251                 case 2:
 252                         queue = IEEE80211_TX_QUEUE_DATA1;
 253                         if (acm) {
 254                                 local->wmm_acm |= BIT(4) | BIT(5);
 255                         }
 256                         break;
 257                 case 3:
 258                         queue = IEEE80211_TX_QUEUE_DATA0;
 259                         if (acm) {
 260                                 local->wmm_acm |= BIT(6) | BIT(7);
 261                         }
 262                         break;
 263                 case 0:
 264                 default:
 265                         queue = IEEE80211_TX_QUEUE_DATA2;
 266                         if (acm) {
 267                                 local->wmm_acm |= BIT(1) | BIT(2);
 268                         }
 269                         break;
 270                 }
 271
 272                 params.aifs = pos[0] & 0x0f;
 273                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 274                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 275                 /* TXOP is in units of 32 usec; burst_time in 0.1 ms */
 276                 params.burst_time = (pos[2] | (pos[3] << 8)) * 32 / 100;
 277                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 278                        "cWmin=%d cWmax=%d burst=%d\n",
 279                        dev->name, queue, aci, acm, params.aifs, params.cw_min,
 280                        params.cw_max, params.burst_time);
 281                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 282                  * AC for now) */
 283                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 284                         printk(KERN_DEBUG "%s: failed to set TX queue "
 285                                "parameters for queue %d\n", dev->name, queue);
 286                 }
 287         }
 288 }
 289
 290
 291 static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
 292 {
 293         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 294         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 295         int use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
 296         int preamble_mode = (erp_value & WLAN_ERP_BARKER_PREAMBLE) != 0;
 297         u8 changes = 0;
 298         DECLARE_MAC_BUF(mac);
 299
 300         if (use_protection != !!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION)) {
 301                 if (net_ratelimit()) {
 302                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
 303                                "%s)\n",
 304                                dev->name,
 305                                use_protection ? "enabled" : "disabled",
 306                                print_mac(mac, ifsta->bssid));
 307                 }
 308                 if (use_protection)
 309                         sdata->flags |= IEEE80211_SDATA_USE_PROTECTION;
 310                 else
 311                         sdata->flags &= ~IEEE80211_SDATA_USE_PROTECTION;
 312                 changes |= IEEE80211_ERP_CHANGE_PROTECTION;
 313         }
 314
 315         if (preamble_mode != !(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE)) {
 316                 if (net_ratelimit()) {
 317                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 318                                " (BSSID=%s)\n",
 319                                dev->name,
 320                                (preamble_mode == WLAN_ERP_PREAMBLE_SHORT) ?
 321                                         "short" : "long",
 322                                print_mac(mac, ifsta->bssid));
 323                 }
 324                 if (preamble_mode)
 325                         sdata->flags &= ~IEEE80211_SDATA_SHORT_PREAMBLE;
 326                 else
 327                         sdata->flags |= IEEE80211_SDATA_SHORT_PREAMBLE;
 328                 changes |= IEEE80211_ERP_CHANGE_PREAMBLE;
 329         }
 330
 331         if (changes)
 332                 ieee80211_erp_info_change_notify(dev, changes);
 333 }
 334
 335
 336 static void ieee80211_sta_send_associnfo(struct net_device *dev,
 337                                          struct ieee80211_if_sta *ifsta)
 338 {
 339         char *buf;
 340         size_t len;
 341         int i;
 342         union iwreq_data wrqu;
 343
 344         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 345                 return;
 346
 347         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 348                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 349         if (!buf)
 350                 return;
 351
 352         len = sprintf(buf, "ASSOCINFO(");
 353         if (ifsta->assocreq_ies) {
 354                 len += sprintf(buf + len, "ReqIEs=");
 355                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 356                         len += sprintf(buf + len, "%02x",
 357                                        ifsta->assocreq_ies[i]);
 358                 }
 359         }
 360         if (ifsta->assocresp_ies) {
 361                 if (ifsta->assocreq_ies)
 362                         len += sprintf(buf + len, " ");
 363                 len += sprintf(buf + len, "RespIEs=");
 364                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 365                         len += sprintf(buf + len, "%02x",
 366                                        ifsta->assocresp_ies[i]);
 367                 }
 368         }
 369         len += sprintf(buf + len, ")");
 370
 371         if (len > IW_CUSTOM_MAX) {
 372                 len = sprintf(buf, "ASSOCRESPIE=");
 373                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 374                         len += sprintf(buf + len, "%02x",
 375                                        ifsta->assocresp_ies[i]);
 376                 }
 377         }
 378
 379         memset(&wrqu, 0, sizeof(wrqu));
 380         wrqu.data.length = len;
 381         wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 382
 383         kfree(buf);
 384 }
 385
 386
 387 static void ieee80211_set_associated(struct net_device *dev,
 388                                      struct ieee80211_if_sta *ifsta,
 389                                      bool assoc)
 390 {
 391         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 392         union iwreq_data wrqu;
 393
 394         if (!!(ifsta->flags & IEEE80211_STA_ASSOCIATED) == assoc)
 395                 return;
 396
 397         if (assoc) {
 398                 struct ieee80211_sub_if_data *sdata;
 399                 struct ieee80211_sta_bss *bss;
 400
 401                 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 402
 403                 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 404                 if (sdata->type != IEEE80211_IF_TYPE_STA)
 405                         return;
 406
 407                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
 408                                            local->hw.conf.channel,
 409                                            ifsta->ssid, ifsta->ssid_len);
 410                 if (bss) {
 411                         if (bss->has_erp_value)
 412                                 ieee80211_handle_erp_ie(dev, bss->erp_value);
 413                         ieee80211_rx_bss_put(dev, bss);
 414                 }
 415
 416                 netif_carrier_on(dev);
 417                 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 418                 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 419                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 420                 ieee80211_sta_send_associnfo(dev, ifsta);
 421         } else {
 422                 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 423
 424                 netif_carrier_off(dev);
 425                 ieee80211_reset_erp_info(dev);
 426                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 427         }
 428         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 429         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 430         ifsta->last_probe = jiffies;
 431         ieee80211_led_assoc(local, assoc);
 432 }
 433
 434 static void ieee80211_set_disassoc(struct net_device *dev,
 435                                    struct ieee80211_if_sta *ifsta, int deauth)
 436 {
 437         if (deauth)
 438                 ifsta->auth_tries = 0;
 439         ifsta->assoc_tries = 0;
 440         ieee80211_set_associated(dev, ifsta, 0);
 441 }
 442
 443 static void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
 444                              int encrypt)
 445 {
 446         struct ieee80211_sub_if_data *sdata;
 447         struct ieee80211_tx_packet_data *pkt_data;
 448
 449         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 450         skb->dev = sdata->local->mdev;
 451         skb_set_mac_header(skb, 0);
 452         skb_set_network_header(skb, 0);
 453         skb_set_transport_header(skb, 0);
 454
 455         pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 456         memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
 457         pkt_data->ifindex = sdata->dev->ifindex;
 458         if (!encrypt)
 459                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
 460
 461         dev_queue_xmit(skb);
 462 }
 463
 464
 465 static void ieee80211_send_auth(struct net_device *dev,
 466                                 struct ieee80211_if_sta *ifsta,
 467                                 int transaction, u8 *extra, size_t extra_len,
 468                                 int encrypt)
 469 {
 470         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 471         struct sk_buff *skb;
 472         struct ieee80211_mgmt *mgmt;
 473
 474         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 475                             sizeof(*mgmt) + 6 + extra_len);
 476         if (!skb) {
 477                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 478                        "frame\n", dev->name);
 479                 return;
 480         }
 481         skb_reserve(skb, local->hw.extra_tx_headroom);
 482
 483         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 484         memset(mgmt, 0, 24 + 6);
 485         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 486                                            IEEE80211_STYPE_AUTH);
 487         if (encrypt)
 488                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 489         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 490         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 491         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 492         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 493         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 494         ifsta->auth_transaction = transaction + 1;
 495         mgmt->u.auth.status_code = cpu_to_le16(0);
 496         if (extra)
 497                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 498
 499         ieee80211_sta_tx(dev, skb, encrypt);
 500 }
 501
 502
 503 static void ieee80211_authenticate(struct net_device *dev,
 504                                    struct ieee80211_if_sta *ifsta)
 505 {
 506         DECLARE_MAC_BUF(mac);
 507
 508         ifsta->auth_tries++;
 509         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 510                 printk(KERN_DEBUG "%s: authentication with AP %s"
 511                        " timed out\n",
 512                        dev->name, print_mac(mac, ifsta->bssid));
 513                 ifsta->state = IEEE80211_DISABLED;
 514                 return;
 515         }
 516
 517         ifsta->state = IEEE80211_AUTHENTICATE;
 518         printk(KERN_DEBUG "%s: authenticate with AP %s\n",
 519                dev->name, print_mac(mac, ifsta->bssid));
 520
 521         ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);
 522
 523         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 524 }
 525
 526
 527 static void ieee80211_send_assoc(struct net_device *dev,
 528                                  struct ieee80211_if_sta *ifsta)
 529 {
 530         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 531         struct ieee80211_hw_mode *mode;
 532         struct sk_buff *skb;
 533         struct ieee80211_mgmt *mgmt;
 534         u8 *pos, *ies;
 535         int i, len;
 536         u16 capab;
 537         struct ieee80211_sta_bss *bss;
 538         int wmm = 0;
 539
 540         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 541                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 542                             ifsta->ssid_len);
 543         if (!skb) {
 544                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 545                        "frame\n", dev->name);
 546                 return;
 547         }
 548         skb_reserve(skb, local->hw.extra_tx_headroom);
 549
 550         mode = local->oper_hw_mode;
 551         capab = ifsta->capab;
 552         if (mode->mode == MODE_IEEE80211G) {
 553                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME |
 554                         WLAN_CAPABILITY_SHORT_PREAMBLE;
 555         }
 556         bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel,
 557                                    ifsta->ssid, ifsta->ssid_len);
 558         if (bss) {
 559                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 560                         capab |= WLAN_CAPABILITY_PRIVACY;
 561                 if (bss->wmm_ie) {
 562                         wmm = 1;
 563                 }
 564                 ieee80211_rx_bss_put(dev, bss);
 565         }
 566
 567         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 568         memset(mgmt, 0, 24);
 569         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 570         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 571         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 572
 573         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 574                 skb_put(skb, 10);
 575                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 576                                                    IEEE80211_STYPE_REASSOC_REQ);
 577                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 578                 mgmt->u.reassoc_req.listen_interval = cpu_to_le16(1);
 579                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 580                        ETH_ALEN);
 581         } else {
 582                 skb_put(skb, 4);
 583                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 584                                                    IEEE80211_STYPE_ASSOC_REQ);
 585                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 586                 mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
 587         }
 588
 589         /* SSID */
 590         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 591         *pos++ = WLAN_EID_SSID;
 592         *pos++ = ifsta->ssid_len;
 593         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 594
 595         len = mode->num_rates;
 596         if (len > 8)
 597                 len = 8;
 598         pos = skb_put(skb, len + 2);
 599         *pos++ = WLAN_EID_SUPP_RATES;
 600         *pos++ = len;
 601         for (i = 0; i < len; i++) {
 602                 int rate = mode->rates[i].rate;
 603                 *pos++ = (u8) (rate / 5);
 604         }
 605
 606         if (mode->num_rates > len) {
 607                 pos = skb_put(skb, mode->num_rates - len + 2);
 608                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 609                 *pos++ = mode->num_rates - len;
 610                 for (i = len; i < mode->num_rates; i++) {
 611                         int rate = mode->rates[i].rate;
 612                         *pos++ = (u8) (rate / 5);
 613                 }
 614         }
 615
 616         if (ifsta->extra_ie) {
 617                 pos = skb_put(skb, ifsta->extra_ie_len);
 618                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 619         }
 620
 621         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 622                 pos = skb_put(skb, 9);
 623                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 624                 *pos++ = 7; /* len */
 625                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 626                 *pos++ = 0x50;
 627                 *pos++ = 0xf2;
 628                 *pos++ = 2; /* WME */
 629                 *pos++ = 0; /* WME info */
 630                 *pos++ = 1; /* WME ver */
 631                 *pos++ = 0;
 632         }
 633
 634         kfree(ifsta->assocreq_ies);
 635         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 636         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 637         if (ifsta->assocreq_ies)
 638                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 639
 640         ieee80211_sta_tx(dev, skb, 0);
 641 }
 642
 643
 644 static void ieee80211_send_deauth(struct net_device *dev,
 645                                   struct ieee80211_if_sta *ifsta, u16 reason)
 646 {
 647         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 648         struct sk_buff *skb;
 649         struct ieee80211_mgmt *mgmt;
 650
 651         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 652         if (!skb) {
 653                 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
 654                        "frame\n", dev->name);
 655                 return;
 656         }
 657         skb_reserve(skb, local->hw.extra_tx_headroom);
 658
 659         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 660         memset(mgmt, 0, 24);
 661         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 662         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 663         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 664         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 665                                            IEEE80211_STYPE_DEAUTH);
 666         skb_put(skb, 2);
 667         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 668
 669         ieee80211_sta_tx(dev, skb, 0);
 670 }
 671
 672
 673 static void ieee80211_send_disassoc(struct net_device *dev,
 674                                     struct ieee80211_if_sta *ifsta, u16 reason)
 675 {
 676         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 677         struct sk_buff *skb;
 678         struct ieee80211_mgmt *mgmt;
 679
 680         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 681         if (!skb) {
 682                 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
 683                        "frame\n", dev->name);
 684                 return;
 685         }
 686         skb_reserve(skb, local->hw.extra_tx_headroom);
 687
 688         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 689         memset(mgmt, 0, 24);
 690         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 691         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 692         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 693         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 694                                            IEEE80211_STYPE_DISASSOC);
 695         skb_put(skb, 2);
 696         mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
 697
 698         ieee80211_sta_tx(dev, skb, 0);
 699 }
 700
 701
 702 static int ieee80211_privacy_mismatch(struct net_device *dev,
 703                                       struct ieee80211_if_sta *ifsta)
 704 {
 705         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 706         struct ieee80211_sta_bss *bss;
 707         int bss_privacy;
 708         int wep_privacy;
 709         int privacy_invoked;
 710
 711         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
 712                 return 0;
 713
 714         bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel,
 715                                    ifsta->ssid, ifsta->ssid_len);
 716         if (!bss)
 717                 return 0;
 718
 719         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
 720         wep_privacy = !!ieee80211_sta_wep_configured(dev);
 721         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
 722
 723         ieee80211_rx_bss_put(dev, bss);
 724
 725         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 726                 return 0;
 727
 728         return 1;
 729 }
 730
 731
 732 static void ieee80211_associate(struct net_device *dev,
 733                                 struct ieee80211_if_sta *ifsta)
 734 {
 735         DECLARE_MAC_BUF(mac);
 736
 737         ifsta->assoc_tries++;
 738         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 739                 printk(KERN_DEBUG "%s: association with AP %s"
 740                        " timed out\n",
 741                        dev->name, print_mac(mac, ifsta->bssid));
 742                 ifsta->state = IEEE80211_DISABLED;
 743                 return;
 744         }
 745
 746         ifsta->state = IEEE80211_ASSOCIATE;
 747         printk(KERN_DEBUG "%s: associate with AP %s\n",
 748                dev->name, print_mac(mac, ifsta->bssid));
 749         if (ieee80211_privacy_mismatch(dev, ifsta)) {
 750                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 751                        "mixed-cell disabled - abort association\n", dev->name);
 752                 ifsta->state = IEEE80211_DISABLED;
 753                 return;
 754         }
 755
 756         ieee80211_send_assoc(dev, ifsta);
 757
 758         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 759 }
 760
 761
 762 static void ieee80211_associated(struct net_device *dev,
 763                                  struct ieee80211_if_sta *ifsta)
 764 {
 765         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 766         struct sta_info *sta;
 767         int disassoc;
 768         DECLARE_MAC_BUF(mac);
 769
 770         /* TODO: start monitoring current AP signal quality and number of
 771          * missed beacons. Scan other channels every now and then and search
 772          * for better APs. */
 773         /* TODO: remove expired BSSes */
 774
 775         ifsta->state = IEEE80211_ASSOCIATED;
 776
 777         sta = sta_info_get(local, ifsta->bssid);
 778         if (!sta) {
 779                 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
 780                        dev->name, print_mac(mac, ifsta->bssid));
 781                 disassoc = 1;
 782         } else {
 783                 disassoc = 0;
 784                 if (time_after(jiffies,
 785                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 786                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
 787                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 788                                        "current AP %s - assume out of "
 789                                        "range\n",
 790                                        dev->name, print_mac(mac, ifsta->bssid));
 791                                 disassoc = 1;
 792                                 sta_info_free(sta);
 793                         } else
 794                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 795                                                          local->scan_ssid,
 796                                                          local->scan_ssid_len);
 797                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 798                 } else {
 799                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 800                         if (time_after(jiffies, ifsta->last_probe +
 801                                        IEEE80211_PROBE_INTERVAL)) {
 802                                 ifsta->last_probe = jiffies;
 803                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 804                                                          ifsta->ssid,
 805                                                          ifsta->ssid_len);
 806                         }
 807                 }
 808                 sta_info_put(sta);
 809         }
 810         if (disassoc) {
 811                 union iwreq_data wrqu;
 812                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 813                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 814                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 815                 mod_timer(&ifsta->timer, jiffies +
 816                                       IEEE80211_MONITORING_INTERVAL + 30 * HZ);
 817         } else {
 818                 mod_timer(&ifsta->timer, jiffies +
 819                                       IEEE80211_MONITORING_INTERVAL);
 820         }
 821 }
 822
 823
 824 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
 825                                      u8 *ssid, size_t ssid_len)
 826 {
 827         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 828         struct ieee80211_hw_mode *mode;
 829         struct sk_buff *skb;
 830         struct ieee80211_mgmt *mgmt;
 831         u8 *pos, *supp_rates, *esupp_rates = NULL;
 832         int i;
 833
 834         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
 835         if (!skb) {
 836                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 837                        "request\n", dev->name);
 838                 return;
 839         }
 840         skb_reserve(skb, local->hw.extra_tx_headroom);
 841
 842         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 843         memset(mgmt, 0, 24);
 844         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 845                                            IEEE80211_STYPE_PROBE_REQ);
 846         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 847         if (dst) {
 848                 memcpy(mgmt->da, dst, ETH_ALEN);
 849                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 850         } else {
 851                 memset(mgmt->da, 0xff, ETH_ALEN);
 852                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 853         }
 854         pos = skb_put(skb, 2 + ssid_len);
 855         *pos++ = WLAN_EID_SSID;
 856         *pos++ = ssid_len;
 857         memcpy(pos, ssid, ssid_len);
 858
 859         supp_rates = skb_put(skb, 2);
 860         supp_rates[0] = WLAN_EID_SUPP_RATES;
 861         supp_rates[1] = 0;
 862         mode = local->oper_hw_mode;
 863         for (i = 0; i < mode->num_rates; i++) {
 864                 struct ieee80211_rate *rate = &mode->rates[i];
 865                 if (!(rate->flags & IEEE80211_RATE_SUPPORTED))
 866                         continue;
 867                 if (esupp_rates) {
 868                         pos = skb_put(skb, 1);
 869                         esupp_rates[1]++;
 870                 } else if (supp_rates[1] == 8) {
 871                         esupp_rates = skb_put(skb, 3);
 872                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 873                         esupp_rates[1] = 1;
 874                         pos = &esupp_rates[2];
 875                 } else {
 876                         pos = skb_put(skb, 1);
 877                         supp_rates[1]++;
 878                 }
 879                 *pos = rate->rate / 5;
 880         }
 881
 882         ieee80211_sta_tx(dev, skb, 0);
 883 }
 884
 885
 886 static int ieee80211_sta_wep_configured(struct net_device *dev)
 887 {
 888         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 889         if (!sdata || !sdata->default_key ||
 890             sdata->default_key->conf.alg != ALG_WEP)
 891                 return 0;
 892         return 1;
 893 }
 894
 895
 896 static void ieee80211_auth_completed(struct net_device *dev,
 897                                      struct ieee80211_if_sta *ifsta)
 898 {
 899         printk(KERN_DEBUG "%s: authenticated\n", dev->name);
 900         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
 901         ieee80211_associate(dev, ifsta);
 902 }
 903
 904
 905 static void ieee80211_auth_challenge(struct net_device *dev,
 906                                      struct ieee80211_if_sta *ifsta,
 907                                      struct ieee80211_mgmt *mgmt,
 908                                      size_t len)
 909 {
 910         u8 *pos;
 911         struct ieee802_11_elems elems;
 912
 913         printk(KERN_DEBUG "%s: replying to auth challenge\n", dev->name);
 914         pos = mgmt->u.auth.variable;
 915         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
 916         if (!elems.challenge) {
 917                 printk(KERN_DEBUG "%s: no challenge IE in shared key auth "
 918                        "frame\n", dev->name);
 919                 return;
 920         }
 921         ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
 922                             elems.challenge_len + 2, 1);
 923 }
 924
 925
 926 static void ieee80211_rx_mgmt_auth(struct net_device *dev,
 927                                    struct ieee80211_if_sta *ifsta,
 928                                    struct ieee80211_mgmt *mgmt,
 929                                    size_t len)
 930 {
 931         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 932         u16 auth_alg, auth_transaction, status_code;
 933         DECLARE_MAC_BUF(mac);
 934
 935         if (ifsta->state != IEEE80211_AUTHENTICATE &&
 936             sdata->type != IEEE80211_IF_TYPE_IBSS) {
 937                 printk(KERN_DEBUG "%s: authentication frame received from "
 938                        "%s, but not in authenticate state - ignored\n",
 939                        dev->name, print_mac(mac, mgmt->sa));
 940                 return;
 941         }
 942
 943         if (len < 24 + 6) {
 944                 printk(KERN_DEBUG "%s: too short (%zd) authentication frame "
 945                        "received from %s - ignored\n",
 946                        dev->name, len, print_mac(mac, mgmt->sa));
 947                 return;
 948         }
 949
 950         if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
 951             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
 952                 printk(KERN_DEBUG "%s: authentication frame received from "
 953                        "unknown AP (SA=%s BSSID=%s) - "
 954                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
 955                        print_mac(mac, mgmt->bssid));
 956                 return;
 957         }
 958
 959         if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
 960             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) {
 961                 printk(KERN_DEBUG "%s: authentication frame received from "
 962                        "unknown BSSID (SA=%s BSSID=%s) - "
 963                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
 964                        print_mac(mac, mgmt->bssid));
 965                 return;
 966         }
 967
 968         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 969         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 970         status_code = le16_to_cpu(mgmt->u.auth.status_code);
 971
 972         printk(KERN_DEBUG "%s: RX authentication from %s (alg=%d "
 973                "transaction=%d status=%d)\n",
 974                dev->name, print_mac(mac, mgmt->sa), auth_alg,
 975                auth_transaction, status_code);
 976
 977         if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
 978                 /* IEEE 802.11 standard does not require authentication in IBSS
 979                  * networks and most implementations do not seem to use it.
 980                  * However, try to reply to authentication attempts if someone
 981                  * has actually implemented this.
 982                  * TODO: Could implement shared key authentication. */
 983                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) {
 984                         printk(KERN_DEBUG "%s: unexpected IBSS authentication "
 985                                "frame (alg=%d transaction=%d)\n",
 986                                dev->name, auth_alg, auth_transaction);
 987                         return;
 988                 }
 989                 ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
 990         }
 991
 992         if (auth_alg != ifsta->auth_alg ||
 993             auth_transaction != ifsta->auth_transaction) {
 994                 printk(KERN_DEBUG "%s: unexpected authentication frame "
 995                        "(alg=%d transaction=%d)\n",
 996                        dev->name, auth_alg, auth_transaction);
 997                 return;
 998         }
 999
1000         if (status_code != WLAN_STATUS_SUCCESS) {
1001                 printk(KERN_DEBUG "%s: AP denied authentication (auth_alg=%d "
1002                        "code=%d)\n", dev->name, ifsta->auth_alg, status_code);
1003                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1004                         u8 algs[3];
1005                         const int num_algs = ARRAY_SIZE(algs);
1006                         int i, pos;
1007                         algs[0] = algs[1] = algs[2] = 0xff;
1008                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1009                                 algs[0] = WLAN_AUTH_OPEN;
1010                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1011                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1012                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1013                                 algs[2] = WLAN_AUTH_LEAP;
1014                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1015                                 pos = 0;
1016                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1017                                 pos = 1;
1018                         else
1019                                 pos = 2;
1020                         for (i = 0; i < num_algs; i++) {
1021                                 pos++;
1022                                 if (pos >= num_algs)
1023                                         pos = 0;
1024                                 if (algs[pos] == ifsta->auth_alg ||
1025                                     algs[pos] == 0xff)
1026                                         continue;
1027                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1028                                     !ieee80211_sta_wep_configured(dev))
1029                                         continue;
1030                                 ifsta->auth_alg = algs[pos];
1031                                 printk(KERN_DEBUG "%s: set auth_alg=%d for "
1032                                        "next try\n",
1033                                        dev->name, ifsta->auth_alg);
1034                                 break;
1035                         }
1036                 }
1037                 return;
1038         }
1039
1040         switch (ifsta->auth_alg) {
1041         case WLAN_AUTH_OPEN:
1042         case WLAN_AUTH_LEAP:
1043                 ieee80211_auth_completed(dev, ifsta);
1044                 break;
1045         case WLAN_AUTH_SHARED_KEY:
1046                 if (ifsta->auth_transaction == 4)
1047                         ieee80211_auth_completed(dev, ifsta);
1048                 else
1049                         ieee80211_auth_challenge(dev, ifsta, mgmt, len);
1050                 break;
1051         }
1052 }
1053
1054
1055 static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
1056                                      struct ieee80211_if_sta *ifsta,
1057                                      struct ieee80211_mgmt *mgmt,
1058                                      size_t len)
1059 {
1060         u16 reason_code;
1061         DECLARE_MAC_BUF(mac);
1062
1063         if (len < 24 + 2) {
1064                 printk(KERN_DEBUG "%s: too short (%zd) deauthentication frame "
1065                        "received from %s - ignored\n",
1066                        dev->name, len, print_mac(mac, mgmt->sa));
1067                 return;
1068         }
1069
1070         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1071                 printk(KERN_DEBUG "%s: deauthentication frame received from "
1072                        "unknown AP (SA=%s BSSID=%s) - "
1073                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1074                        print_mac(mac, mgmt->bssid));
1075                 return;
1076         }
1077
1078         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1079
1080         printk(KERN_DEBUG "%s: RX deauthentication from %s"
1081                " (reason=%d)\n",
1082                dev->name, print_mac(mac, mgmt->sa), reason_code);
1083
1084         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED) {
1085                 printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
1086         }
1087
1088         if (ifsta->state == IEEE80211_AUTHENTICATE ||
1089             ifsta->state == IEEE80211_ASSOCIATE ||
1090             ifsta->state == IEEE80211_ASSOCIATED) {
1091                 ifsta->state = IEEE80211_AUTHENTICATE;
1092                 mod_timer(&ifsta->timer, jiffies +
1093                                       IEEE80211_RETRY_AUTH_INTERVAL);
1094         }
1095
1096         ieee80211_set_disassoc(dev, ifsta, 1);
1097         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1098 }
1099
1100
1101 static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
1102                                        struct ieee80211_if_sta *ifsta,
1103                                        struct ieee80211_mgmt *mgmt,
1104                                        size_t len)
1105 {
1106         u16 reason_code;
1107         DECLARE_MAC_BUF(mac);
1108
1109         if (len < 24 + 2) {
1110                 printk(KERN_DEBUG "%s: too short (%zd) disassociation frame "
1111                        "received from %s - ignored\n",
1112                        dev->name, len, print_mac(mac, mgmt->sa));
1113                 return;
1114         }
1115
1116         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1117                 printk(KERN_DEBUG "%s: disassociation frame received from "
1118                        "unknown AP (SA=%s BSSID=%s) - "
1119                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1120                        print_mac(mac, mgmt->bssid));
1121                 return;
1122         }
1123
1124         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1125
1126         printk(KERN_DEBUG "%s: RX disassociation from %s"
1127                " (reason=%d)\n",
1128                dev->name, print_mac(mac, mgmt->sa), reason_code);
1129
1130         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1131                 printk(KERN_DEBUG "%s: disassociated\n", dev->name);
1132
1133         if (ifsta->state == IEEE80211_ASSOCIATED) {
1134                 ifsta->state = IEEE80211_ASSOCIATE;
1135                 mod_timer(&ifsta->timer, jiffies +
1136                                       IEEE80211_RETRY_AUTH_INTERVAL);
1137         }
1138
1139         ieee80211_set_disassoc(dev, ifsta, 0);
1140 }
1141
1142
1143 static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
1144                                          struct ieee80211_if_sta *ifsta,
1145                                          struct ieee80211_mgmt *mgmt,
1146                                          size_t len,
1147                                          int reassoc)
1148 {
1149         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1150         struct ieee80211_hw_mode *mode;
1151         struct sta_info *sta;
1152         u32 rates;
1153         u16 capab_info, status_code, aid;
1154         struct ieee802_11_elems elems;
1155         u8 *pos;
1156         int i, j;
1157         DECLARE_MAC_BUF(mac);
1158
1159         /* AssocResp and ReassocResp have identical structure, so process both
1160          * of them in this function. */
1161
1162         if (ifsta->state != IEEE80211_ASSOCIATE) {
1163                 printk(KERN_DEBUG "%s: association frame received from "
1164                        "%s, but not in associate state - ignored\n",
1165                        dev->name, print_mac(mac, mgmt->sa));
1166                 return;
1167         }
1168
1169         if (len < 24 + 6) {
1170                 printk(KERN_DEBUG "%s: too short (%zd) association frame "
1171                        "received from %s - ignored\n",
1172                        dev->name, len, print_mac(mac, mgmt->sa));
1173                 return;
1174         }
1175
1176         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1177                 printk(KERN_DEBUG "%s: association frame received from "
1178                        "unknown AP (SA=%s BSSID=%s) - "
1179                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1180                        print_mac(mac, mgmt->bssid));
1181                 return;
1182         }
1183
1184         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1185         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1186         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1187
1188         printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
1189                "status=%d aid=%d)\n",
1190                dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
1191                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1192
1193         if (status_code != WLAN_STATUS_SUCCESS) {
1194                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1195                        dev->name, status_code);
1196                 /* if this was a reassociation, ensure we try a "full"
1197                  * association next time. This works around some broken APs
1198                  * which do not correctly reject reassociation requests. */
1199                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1200                 return;
1201         }
1202
1203         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1204                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1205                        "set\n", dev->name, aid);
1206         aid &= ~(BIT(15) | BIT(14));
1207
1208         pos = mgmt->u.assoc_resp.variable;
1209         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1210
1211         if (!elems.supp_rates) {
1212                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1213                        dev->name);
1214                 return;
1215         }
1216
1217         /* it probably doesn't, but if the frame includes an ERP value then
1218          * update our stored copy */
1219         if (elems.erp_info && elems.erp_info_len >= 1) {
1220                 struct ieee80211_sta_bss *bss
1221                         = ieee80211_rx_bss_get(dev, ifsta->bssid,
1222                                                local->hw.conf.channel,
1223                                                ifsta->ssid, ifsta->ssid_len);
1224                 if (bss) {
1225                         bss->erp_value = elems.erp_info[0];
1226                         bss->has_erp_value = 1;
1227                         ieee80211_rx_bss_put(dev, bss);
1228                 }
1229         }
1230
1231         printk(KERN_DEBUG "%s: associated\n", dev->name);
1232         ifsta->aid = aid;
1233         ifsta->ap_capab = capab_info;
1234
1235         kfree(ifsta->assocresp_ies);
1236         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1237         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1238         if (ifsta->assocresp_ies)
1239                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1240
1241         ieee80211_set_associated(dev, ifsta, 1);
1242
1243         /* Add STA entry for the AP */
1244         sta = sta_info_get(local, ifsta->bssid);
1245         if (!sta) {
1246                 struct ieee80211_sta_bss *bss;
1247                 sta = sta_info_add(local, dev, ifsta->bssid, GFP_KERNEL);
1248                 if (!sta) {
1249                         printk(KERN_DEBUG "%s: failed to add STA entry for the"
1250                                " AP\n", dev->name);
1251                         return;
1252                 }
1253                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
1254                                            local->hw.conf.channel,
1255                                            ifsta->ssid, ifsta->ssid_len);
1256                 if (bss) {
1257                         sta->last_rssi = bss->rssi;
1258                         sta->last_signal = bss->signal;
1259                         sta->last_noise = bss->noise;
1260                         ieee80211_rx_bss_put(dev, bss);
1261                 }
1262         }
1263
1264         sta->dev = dev;
1265         sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP;
1266
1267         rates = 0;
1268         mode = local->oper_hw_mode;
1269         for (i = 0; i < elems.supp_rates_len; i++) {
1270                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1271                 for (j = 0; j < mode->num_rates; j++)
1272                         if (mode->rates[j].rate == rate)
1273                                 rates |= BIT(j);
1274         }
1275         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1276                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1277                 for (j = 0; j < mode->num_rates; j++)
1278                         if (mode->rates[j].rate == rate)
1279                                 rates |= BIT(j);
1280         }
1281         sta->supp_rates = rates;
1282
1283         rate_control_rate_init(sta, local);
1284
1285         if (elems.wmm_param && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1286                 sta->flags |= WLAN_STA_WME;
1287                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1288                                          elems.wmm_param_len);
1289         }
1290
1291
1292         sta_info_put(sta);
1293
1294         ieee80211_associated(dev, ifsta);
1295 }
1296
1297
1298 /* Caller must hold local->sta_bss_lock */
1299 static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
1300                                         struct ieee80211_sta_bss *bss)
1301 {
1302         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1303         bss->hnext = local->sta_bss_hash[STA_HASH(bss->bssid)];
1304         local->sta_bss_hash[STA_HASH(bss->bssid)] = bss;
1305 }
1306
1307
1308 /* Caller must hold local->sta_bss_lock */
1309 static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
1310                                         struct ieee80211_sta_bss *bss)
1311 {
1312         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1313         struct ieee80211_sta_bss *b, *prev = NULL;
1314         b = local->sta_bss_hash[STA_HASH(bss->bssid)];
1315         while (b) {
1316                 if (b == bss) {
1317                         if (!prev)
1318                                 local->sta_bss_hash[STA_HASH(bss->bssid)] =
1319                                         bss->hnext;
1320                         else
1321                                 prev->hnext = bss->hnext;
1322                         break;
1323                 }
1324                 prev = b;
1325                 b = b->hnext;
1326         }
1327 }
1328
1329
1330 static struct ieee80211_sta_bss *
1331 ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int channel,
1332                      u8 *ssid, u8 ssid_len)
1333 {
1334         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1335         struct ieee80211_sta_bss *bss;
1336
1337         bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
1338         if (!bss)
1339                 return NULL;
1340         atomic_inc(&bss->users);
1341         atomic_inc(&bss->users);
1342         memcpy(bss->bssid, bssid, ETH_ALEN);
1343         bss->channel = channel;
1344         if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
1345                 memcpy(bss->ssid, ssid, ssid_len);
1346                 bss->ssid_len = ssid_len;
1347         }
1348
1349         spin_lock_bh(&local->sta_bss_lock);
1350         /* TODO: order by RSSI? */
1351         list_add_tail(&bss->list, &local->sta_bss_list);
1352         __ieee80211_rx_bss_hash_add(dev, bss);
1353         spin_unlock_bh(&local->sta_bss_lock);
1354         return bss;
1355 }
1356
1357
1358 static struct ieee80211_sta_bss *
1359 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel,
1360                      u8 *ssid, u8 ssid_len)
1361 {
1362         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1363         struct ieee80211_sta_bss *bss;
1364
1365         spin_lock_bh(&local->sta_bss_lock);
1366         bss = local->sta_bss_hash[STA_HASH(bssid)];
1367         while (bss) {
1368                 if (!memcmp(bss->bssid, bssid, ETH_ALEN) &&
1369                     bss->channel == channel &&
1370                     bss->ssid_len == ssid_len &&
1371                     (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
1372                         atomic_inc(&bss->users);
1373                         break;
1374                 }
1375                 bss = bss->hnext;
1376         }
1377         spin_unlock_bh(&local->sta_bss_lock);
1378         return bss;
1379 }
1380
1381
1382 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
1383 {
1384         kfree(bss->wpa_ie);
1385         kfree(bss->rsn_ie);
1386         kfree(bss->wmm_ie);
1387         kfree(bss);
1388 }
1389
1390
1391 static void ieee80211_rx_bss_put(struct net_device *dev,
1392                                  struct ieee80211_sta_bss *bss)
1393 {
1394         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1395         if (!atomic_dec_and_test(&bss->users))
1396                 return;
1397
1398         spin_lock_bh(&local->sta_bss_lock);
1399         __ieee80211_rx_bss_hash_del(dev, bss);
1400         list_del(&bss->list);
1401         spin_unlock_bh(&local->sta_bss_lock);
1402         ieee80211_rx_bss_free(bss);
1403 }
1404
1405
1406 void ieee80211_rx_bss_list_init(struct net_device *dev)
1407 {
1408         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1409         spin_lock_init(&local->sta_bss_lock);
1410         INIT_LIST_HEAD(&local->sta_bss_list);
1411 }
1412
1413
1414 void ieee80211_rx_bss_list_deinit(struct net_device *dev)
1415 {
1416         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1417         struct ieee80211_sta_bss *bss, *tmp;
1418
1419         list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
1420                 ieee80211_rx_bss_put(dev, bss);
1421 }
1422
1423
1424 static void ieee80211_rx_bss_info(struct net_device *dev,
1425                                   struct ieee80211_mgmt *mgmt,
1426                                   size_t len,
1427                                   struct ieee80211_rx_status *rx_status,
1428                                   int beacon)
1429 {
1430         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1431         struct ieee802_11_elems elems;
1432         size_t baselen;
1433         int channel, clen;
1434         struct ieee80211_sta_bss *bss;
1435         struct sta_info *sta;
1436         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1437         u64 timestamp;
1438         DECLARE_MAC_BUF(mac);
1439         DECLARE_MAC_BUF(mac2);
1440
1441         if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
1442                 return; /* ignore ProbeResp to foreign address */
1443
1444 #if 0
1445         printk(KERN_DEBUG "%s: RX %s from %s to %s\n",
1446                dev->name, beacon ? "Beacon" : "Probe Response",
1447                print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da));
1448 #endif
1449
1450         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1451         if (baselen > len)
1452                 return;
1453
1454         timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1455
1456         if (sdata->type == IEEE80211_IF_TYPE_IBSS && beacon &&
1457             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1458 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1459                 static unsigned long last_tsf_debug = 0;
1460                 u64 tsf;
1461                 if (local->ops->get_tsf)
1462                         tsf = local->ops->get_tsf(local_to_hw(local));
1463                 else
1464                         tsf = -1LLU;
1465                 if (time_after(jiffies, last_tsf_debug + 5 * HZ)) {
1466                         printk(KERN_DEBUG "RX beacon SA=%s BSSID="
1467                                "%s TSF=0x%llx BCN=0x%llx diff=%lld "
1468                                "@%lu\n",
1469                                print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->bssid),
1470                                (unsigned long long)tsf,
1471                                (unsigned long long)timestamp,
1472                                (unsigned long long)(tsf - timestamp),
1473                                jiffies);
1474                         last_tsf_debug = jiffies;
1475                 }
1476 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1477         }
1478
1479         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1480
1481         if (sdata->type == IEEE80211_IF_TYPE_IBSS && elems.supp_rates &&
1482             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
1483             (sta = sta_info_get(local, mgmt->sa))) {
1484                 struct ieee80211_hw_mode *mode;
1485                 struct ieee80211_rate *rates;
1486                 size_t num_rates;
1487                 u32 supp_rates, prev_rates;
1488                 int i, j;
1489
1490                 mode = local->sta_scanning ?
1491                        local->scan_hw_mode : local->oper_hw_mode;
1492                 rates = mode->rates;
1493                 num_rates = mode->num_rates;
1494
1495                 supp_rates = 0;
1496                 for (i = 0; i < elems.supp_rates_len +
1497                              elems.ext_supp_rates_len; i++) {
1498                         u8 rate = 0;
1499                         int own_rate;
1500                         if (i < elems.supp_rates_len)
1501                                 rate = elems.supp_rates[i];
1502                         else if (elems.ext_supp_rates)
1503                                 rate = elems.ext_supp_rates
1504                                         [i - elems.supp_rates_len];
1505                         own_rate = 5 * (rate & 0x7f);
1506                         for (j = 0; j < num_rates; j++)
1507                                 if (rates[j].rate == own_rate)
1508                                         supp_rates |= BIT(j);
1509                 }
1510
1511                 prev_rates = sta->supp_rates;
1512                 sta->supp_rates &= supp_rates;
1513                 if (sta->supp_rates == 0) {
1514                         /* No matching rates - this should not really happen.
1515                          * Make sure that at least one rate is marked
1516                          * supported to avoid issues with TX rate ctrl. */
1517                         sta->supp_rates = sdata->u.sta.supp_rates_bits;
1518                 }
1519                 if (sta->supp_rates != prev_rates) {
1520                         printk(KERN_DEBUG "%s: updated supp_rates set for "
1521                                "%s based on beacon info (0x%x & 0x%x -> "
1522                                "0x%x)\n",
1523                                dev->name, print_mac(mac, sta->addr), prev_rates,
1524                                supp_rates, sta->supp_rates);
1525                 }
1526                 sta_info_put(sta);
1527         }
1528
1529         if (!elems.ssid)
1530                 return;
1531
1532         if (elems.ds_params && elems.ds_params_len == 1)
1533                 channel = elems.ds_params[0];
1534         else
1535                 channel = rx_status->channel;
1536
1537         bss = ieee80211_rx_bss_get(dev, mgmt->bssid, channel,
1538                                    elems.ssid, elems.ssid_len);
1539         if (!bss) {
1540                 bss = ieee80211_rx_bss_add(dev, mgmt->bssid, channel,
1541                                            elems.ssid, elems.ssid_len);
1542                 if (!bss)
1543                         return;
1544         } else {
1545 #if 0
1546                 /* TODO: order by RSSI? */
1547                 spin_lock_bh(&local->sta_bss_lock);
1548                 list_move_tail(&bss->list, &local->sta_bss_list);
1549                 spin_unlock_bh(&local->sta_bss_lock);
1550 #endif
1551         }
1552
1553         if (bss->probe_resp && beacon) {
1554                 /* Do not allow beacon to override data from Probe Response. */
1555                 ieee80211_rx_bss_put(dev, bss);
1556                 return;
1557         }
1558
1559         /* save the ERP value so that it is available at association time */
1560         if (elems.erp_info && elems.erp_info_len >= 1) {
1561                 bss->erp_value = elems.erp_info[0];
1562                 bss->has_erp_value = 1;
1563         }
1564
1565         bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
1566         bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
1567
1568         bss->supp_rates_len = 0;
1569         if (elems.supp_rates) {
1570                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1571                 if (clen > elems.supp_rates_len)
1572                         clen = elems.supp_rates_len;
1573                 memcpy(&bss->supp_rates[bss->supp_rates_len], elems.supp_rates,
1574                        clen);
1575                 bss->supp_rates_len += clen;
1576         }
1577         if (elems.ext_supp_rates) {
1578                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1579                 if (clen > elems.ext_supp_rates_len)
1580                         clen = elems.ext_supp_rates_len;
1581                 memcpy(&bss->supp_rates[bss->supp_rates_len],
1582                        elems.ext_supp_rates, clen);
1583                 bss->supp_rates_len += clen;
1584         }
1585
1586         if (elems.wpa &&
1587             (!bss->wpa_ie || bss->wpa_ie_len != elems.wpa_len ||
1588              memcmp(bss->wpa_ie, elems.wpa, elems.wpa_len))) {
1589                 kfree(bss->wpa_ie);
1590                 bss->wpa_ie = kmalloc(elems.wpa_len + 2, GFP_ATOMIC);
1591                 if (bss->wpa_ie) {
1592                         memcpy(bss->wpa_ie, elems.wpa - 2, elems.wpa_len + 2);
1593                         bss->wpa_ie_len = elems.wpa_len + 2;
1594                 } else
1595                         bss->wpa_ie_len = 0;
1596         } else if (!elems.wpa && bss->wpa_ie) {
1597                 kfree(bss->wpa_ie);
1598                 bss->wpa_ie = NULL;
1599                 bss->wpa_ie_len = 0;
1600         }
1601
1602         if (elems.rsn &&
1603             (!bss->rsn_ie || bss->rsn_ie_len != elems.rsn_len ||
1604              memcmp(bss->rsn_ie, elems.rsn, elems.rsn_len))) {
1605                 kfree(bss->rsn_ie);
1606                 bss->rsn_ie = kmalloc(elems.rsn_len + 2, GFP_ATOMIC);
1607                 if (bss->rsn_ie) {
1608                         memcpy(bss->rsn_ie, elems.rsn - 2, elems.rsn_len + 2);
1609                         bss->rsn_ie_len = elems.rsn_len + 2;
1610                 } else
1611                         bss->rsn_ie_len = 0;
1612         } else if (!elems.rsn && bss->rsn_ie) {
1613                 kfree(bss->rsn_ie);
1614                 bss->rsn_ie = NULL;
1615                 bss->rsn_ie_len = 0;
1616         }
1617
1618         if (elems.wmm_param &&
1619             (!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_param_len ||
1620              memcmp(bss->wmm_ie, elems.wmm_param, elems.wmm_param_len))) {
1621                 kfree(bss->wmm_ie);
1622                 bss->wmm_ie = kmalloc(elems.wmm_param_len + 2, GFP_ATOMIC);
1623                 if (bss->wmm_ie) {
1624                         memcpy(bss->wmm_ie, elems.wmm_param - 2,
1625                                elems.wmm_param_len + 2);
1626                         bss->wmm_ie_len = elems.wmm_param_len + 2;
1627                 } else
1628                         bss->wmm_ie_len = 0;
1629         } else if (!elems.wmm_param && bss->wmm_ie) {
1630                 kfree(bss->wmm_ie);
1631                 bss->wmm_ie = NULL;
1632                 bss->wmm_ie_len = 0;
1633         }
1634
1635
1636         bss->hw_mode = rx_status->phymode;
1637         bss->freq = rx_status->freq;
1638         if (channel != rx_status->channel &&
1639             (bss->hw_mode == MODE_IEEE80211G ||
1640              bss->hw_mode == MODE_IEEE80211B) &&
1641             channel >= 1 && channel <= 14) {
1642                 static const int freq_list[] = {
1643                         2412, 2417, 2422, 2427, 2432, 2437, 2442,
1644                         2447, 2452, 2457, 2462, 2467, 2472, 2484
1645                 };
1646                 /* IEEE 802.11g/b mode can receive packets from neighboring
1647                  * channels, so map the channel into frequency. */
1648                 bss->freq = freq_list[channel - 1];
1649         }
1650         bss->timestamp = timestamp;
1651         bss->last_update = jiffies;
1652         bss->rssi = rx_status->ssi;
1653         bss->signal = rx_status->signal;
1654         bss->noise = rx_status->noise;
1655         if (!beacon)
1656                 bss->probe_resp++;
1657         ieee80211_rx_bss_put(dev, bss);
1658 }
1659
1660
1661 static void ieee80211_rx_mgmt_probe_resp(struct net_device *dev,
1662                                          struct ieee80211_mgmt *mgmt,
1663                                          size_t len,
1664                                          struct ieee80211_rx_status *rx_status)
1665 {
1666         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 0);
1667 }
1668
1669
1670 static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
1671                                      struct ieee80211_mgmt *mgmt,
1672                                      size_t len,
1673                                      struct ieee80211_rx_status *rx_status)
1674 {
1675         struct ieee80211_sub_if_data *sdata;
1676         struct ieee80211_if_sta *ifsta;
1677         size_t baselen;
1678         struct ieee802_11_elems elems;
1679
1680         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 1);
1681
1682         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1683         if (sdata->type != IEEE80211_IF_TYPE_STA)
1684                 return;
1685         ifsta = &sdata->u.sta;
1686
1687         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1688             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1689                 return;
1690
1691         /* Process beacon from the current BSS */
1692         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1693         if (baselen > len)
1694                 return;
1695
1696         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1697
1698         if (elems.erp_info && elems.erp_info_len >= 1)
1699                 ieee80211_handle_erp_ie(dev, elems.erp_info[0]);
1700
1701         if (elems.wmm_param && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1702                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1703                                          elems.wmm_param_len);
1704         }
1705 }
1706
1707
1708 static void ieee80211_rx_mgmt_probe_req(struct net_device *dev,
1709                                         struct ieee80211_if_sta *ifsta,
1710                                         struct ieee80211_mgmt *mgmt,
1711                                         size_t len,
1712                                         struct ieee80211_rx_status *rx_status)
1713 {
1714         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1715         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1716         int tx_last_beacon;
1717         struct sk_buff *skb;
1718         struct ieee80211_mgmt *resp;
1719         u8 *pos, *end;
1720         DECLARE_MAC_BUF(mac);
1721 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1722         DECLARE_MAC_BUF(mac2);
1723         DECLARE_MAC_BUF(mac3);
1724 #endif
1725
1726         if (sdata->type != IEEE80211_IF_TYPE_IBSS ||
1727             ifsta->state != IEEE80211_IBSS_JOINED ||
1728             len < 24 + 2 || !ifsta->probe_resp)
1729                 return;
1730
1731         if (local->ops->tx_last_beacon)
1732                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1733         else
1734                 tx_last_beacon = 1;
1735
1736 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1737         printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
1738                "%s (tx_last_beacon=%d)\n",
1739                dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
1740                print_mac(mac3, mgmt->bssid), tx_last_beacon);
1741 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1742
1743         if (!tx_last_beacon)
1744                 return;
1745
1746         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1747             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1748                 return;
1749
1750         end = ((u8 *) mgmt) + len;
1751         pos = mgmt->u.probe_req.variable;
1752         if (pos[0] != WLAN_EID_SSID ||
1753             pos + 2 + pos[1] > end) {
1754                 if (net_ratelimit()) {
1755                         printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1756                                "from %s\n",
1757                                dev->name, print_mac(mac, mgmt->sa));
1758                 }
1759                 return;
1760         }
1761         if (pos[1] != 0 &&
1762             (pos[1] != ifsta->ssid_len ||
1763              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1764                 /* Ignore ProbeReq for foreign SSID */
1765                 return;
1766         }
1767
1768         /* Reply with ProbeResp */
1769         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1770         if (!skb)
1771                 return;
1772
1773         resp = (struct ieee80211_mgmt *) skb->data;
1774         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1775 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1776         printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
1777                dev->name, print_mac(mac, resp->da));
1778 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1779         ieee80211_sta_tx(dev, skb, 0);
1780 }
1781
1782
1783 void ieee80211_sta_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
1784                            struct ieee80211_rx_status *rx_status)
1785 {
1786         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1787         struct ieee80211_sub_if_data *sdata;
1788         struct ieee80211_if_sta *ifsta;
1789         struct ieee80211_mgmt *mgmt;
1790         u16 fc;
1791
1792         if (skb->len < 24)
1793                 goto fail;
1794
1795         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1796         ifsta = &sdata->u.sta;
1797
1798         mgmt = (struct ieee80211_mgmt *) skb->data;
1799         fc = le16_to_cpu(mgmt->frame_control);
1800
1801         switch (fc & IEEE80211_FCTL_STYPE) {
1802         case IEEE80211_STYPE_PROBE_REQ:
1803         case IEEE80211_STYPE_PROBE_RESP:
1804         case IEEE80211_STYPE_BEACON:
1805                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1806         case IEEE80211_STYPE_AUTH:
1807         case IEEE80211_STYPE_ASSOC_RESP:
1808         case IEEE80211_STYPE_REASSOC_RESP:
1809         case IEEE80211_STYPE_DEAUTH:
1810         case IEEE80211_STYPE_DISASSOC:
1811                 skb_queue_tail(&ifsta->skb_queue, skb);
1812                 queue_work(local->hw.workqueue, &ifsta->work);
1813                 return;
1814         default:
1815                 printk(KERN_DEBUG "%s: received unknown management frame - "
1816                        "stype=%d\n", dev->name,
1817                        (fc & IEEE80211_FCTL_STYPE) >> 4);
1818                 break;
1819         }
1820
1821  fail:
1822         kfree_skb(skb);
1823 }
1824
1825
1826 static void ieee80211_sta_rx_queued_mgmt(struct net_device *dev,
1827                                          struct sk_buff *skb)
1828 {
1829         struct ieee80211_rx_status *rx_status;
1830         struct ieee80211_sub_if_data *sdata;
1831         struct ieee80211_if_sta *ifsta;
1832         struct ieee80211_mgmt *mgmt;
1833         u16 fc;
1834
1835         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1836         ifsta = &sdata->u.sta;
1837
1838         rx_status = (struct ieee80211_rx_status *) skb->cb;
1839         mgmt = (struct ieee80211_mgmt *) skb->data;
1840         fc = le16_to_cpu(mgmt->frame_control);
1841
1842         switch (fc & IEEE80211_FCTL_STYPE) {
1843         case IEEE80211_STYPE_PROBE_REQ:
1844                 ieee80211_rx_mgmt_probe_req(dev, ifsta, mgmt, skb->len,
1845                                             rx_status);
1846                 break;
1847         case IEEE80211_STYPE_PROBE_RESP:
1848                 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
1849                 break;
1850         case IEEE80211_STYPE_BEACON:
1851                 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
1852                 break;
1853         case IEEE80211_STYPE_AUTH:
1854                 ieee80211_rx_mgmt_auth(dev, ifsta, mgmt, skb->len);
1855                 break;
1856         case IEEE80211_STYPE_ASSOC_RESP:
1857                 ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len, 0);
1858                 break;
1859         case IEEE80211_STYPE_REASSOC_RESP:
1860                 ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len, 1);
1861                 break;
1862         case IEEE80211_STYPE_DEAUTH:
1863                 ieee80211_rx_mgmt_deauth(dev, ifsta, mgmt, skb->len);
1864                 break;
1865         case IEEE80211_STYPE_DISASSOC:
1866                 ieee80211_rx_mgmt_disassoc(dev, ifsta, mgmt, skb->len);
1867                 break;
1868         }
1869
1870         kfree_skb(skb);
1871 }
1872
1873
1874 void ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
1875                            struct ieee80211_rx_status *rx_status)
1876 {
1877         struct ieee80211_mgmt *mgmt;
1878         u16 fc;
1879
1880         if (skb->len < 24) {
1881                 dev_kfree_skb(skb);
1882                 return;
1883         }
1884
1885         mgmt = (struct ieee80211_mgmt *) skb->data;
1886         fc = le16_to_cpu(mgmt->frame_control);
1887
1888         if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) {
1889                 if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP) {
1890                         ieee80211_rx_mgmt_probe_resp(dev, mgmt,
1891                                                      skb->len, rx_status);
1892                 } else if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
1893                         ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len,
1894                                                  rx_status);
1895                 }
1896         }
1897
1898         dev_kfree_skb(skb);
1899 }
1900
1901
1902 static int ieee80211_sta_active_ibss(struct net_device *dev)
1903 {
1904         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1905         int active = 0;
1906         struct sta_info *sta;
1907
1908         read_lock_bh(&local->sta_lock);
1909         list_for_each_entry(sta, &local->sta_list, list) {
1910                 if (sta->dev == dev &&
1911                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1912                                jiffies)) {
1913                         active++;
1914                         break;
1915                 }
1916         }
1917         read_unlock_bh(&local->sta_lock);
1918
1919         return active;
1920 }
1921
1922
1923 static void ieee80211_sta_expire(struct net_device *dev)
1924 {
1925         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1926         struct sta_info *sta, *tmp;
1927         LIST_HEAD(tmp_list);
1928         DECLARE_MAC_BUF(mac);
1929
1930         write_lock_bh(&local->sta_lock);
1931         list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
1932                 if (time_after(jiffies, sta->last_rx +
1933                                IEEE80211_IBSS_INACTIVITY_LIMIT)) {
1934                         printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
1935                                dev->name, print_mac(mac, sta->addr));
1936                         __sta_info_get(sta);
1937                         sta_info_remove(sta);
1938                         list_add(&sta->list, &tmp_list);
1939                 }
1940         write_unlock_bh(&local->sta_lock);
1941
1942         list_for_each_entry_safe(sta, tmp, &tmp_list, list) {
1943                 sta_info_free(sta);
1944                 sta_info_put(sta);
1945         }
1946 }
1947
1948
1949 static void ieee80211_sta_merge_ibss(struct net_device *dev,
1950                                      struct ieee80211_if_sta *ifsta)
1951 {
1952         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1953
1954         ieee80211_sta_expire(dev);
1955         if (ieee80211_sta_active_ibss(dev))
1956                 return;
1957
1958         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1959                "IBSS networks with same SSID (merge)\n", dev->name);
1960         ieee80211_sta_req_scan(dev, ifsta->ssid, ifsta->ssid_len);
1961 }
1962
1963
1964 void ieee80211_sta_timer(unsigned long data)
1965 {
1966         struct ieee80211_sub_if_data *sdata =
1967                 (struct ieee80211_sub_if_data *) data;
1968         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1969         struct ieee80211_local *local = wdev_priv(&sdata->wdev);
1970
1971         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1972         queue_work(local->hw.workqueue, &ifsta->work);
1973 }
1974
1975
1976 void ieee80211_sta_work(struct work_struct *work)
1977 {
1978         struct ieee80211_sub_if_data *sdata =
1979                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
1980         struct net_device *dev = sdata->dev;
1981         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1982         struct ieee80211_if_sta *ifsta;
1983         struct sk_buff *skb;
1984
1985         if (!netif_running(dev))
1986                 return;
1987
1988         if (local->sta_scanning)
1989                 return;
1990
1991         if (sdata->type != IEEE80211_IF_TYPE_STA &&
1992             sdata->type != IEEE80211_IF_TYPE_IBSS) {
1993                 printk(KERN_DEBUG "%s: ieee80211_sta_work: non-STA interface "
1994                        "(type=%d)\n", dev->name, sdata->type);
1995                 return;
1996         }
1997         ifsta = &sdata->u.sta;
1998
1999         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2000                 ieee80211_sta_rx_queued_mgmt(dev, skb);
2001
2002         if (ifsta->state != IEEE80211_AUTHENTICATE &&
2003             ifsta->state != IEEE80211_ASSOCIATE &&
2004             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2005                 ieee80211_sta_start_scan(dev, NULL, 0);
2006                 return;
2007         }
2008
2009         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2010                 if (ieee80211_sta_config_auth(dev, ifsta))
2011                         return;
2012                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2013         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2014                 return;
2015
2016         switch (ifsta->state) {
2017         case IEEE80211_DISABLED:
2018                 break;
2019         case IEEE80211_AUTHENTICATE:
2020                 ieee80211_authenticate(dev, ifsta);
2021                 break;
2022         case IEEE80211_ASSOCIATE:
2023                 ieee80211_associate(dev, ifsta);
2024                 break;
2025         case IEEE80211_ASSOCIATED:
2026                 ieee80211_associated(dev, ifsta);
2027                 break;
2028         case IEEE80211_IBSS_SEARCH:
2029                 ieee80211_sta_find_ibss(dev, ifsta);
2030                 break;
2031         case IEEE80211_IBSS_JOINED:
2032                 ieee80211_sta_merge_ibss(dev, ifsta);
2033                 break;
2034         default:
2035                 printk(KERN_DEBUG "ieee80211_sta_work: Unknown state %d\n",
2036                        ifsta->state);
2037                 break;
2038         }
2039
2040         if (ieee80211_privacy_mismatch(dev, ifsta)) {
2041                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2042                        "mixed-cell disabled - disassociate\n", dev->name);
2043
2044                 ieee80211_send_disassoc(dev, ifsta, WLAN_REASON_UNSPECIFIED);
2045                 ieee80211_set_disassoc(dev, ifsta, 0);
2046         }
2047 }
2048
2049
2050 static void ieee80211_sta_reset_auth(struct net_device *dev,
2051                                      struct ieee80211_if_sta *ifsta)
2052 {
2053         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2054
2055         if (local->ops->reset_tsf) {
2056                 /* Reset own TSF to allow time synchronization work. */
2057                 local->ops->reset_tsf(local_to_hw(local));
2058         }
2059
2060         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2061
2062
2063         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2064                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2065         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2066                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2067         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2068                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2069         else
2070                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2071         printk(KERN_DEBUG "%s: Initial auth_alg=%d\n", dev->name,
2072                ifsta->auth_alg);
2073         ifsta->auth_transaction = -1;
2074         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2075         ifsta->auth_tries = ifsta->assoc_tries = 0;
2076         netif_carrier_off(dev);
2077 }
2078
2079
2080 void ieee80211_sta_req_auth(struct net_device *dev,
2081                             struct ieee80211_if_sta *ifsta)
2082 {
2083         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2084         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2085
2086         if (sdata->type != IEEE80211_IF_TYPE_STA)
2087                 return;
2088
2089         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2090                                 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2091             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2092                                 IEEE80211_STA_AUTO_SSID_SEL))) {
2093                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2094                 queue_work(local->hw.workqueue, &ifsta->work);
2095         }
2096 }
2097
2098 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2099                                     const char *ssid, int ssid_len)
2100 {
2101         int tmp, hidden_ssid;
2102
2103         if (ssid_len == ifsta->ssid_len &&
2104             !memcmp(ifsta->ssid, ssid, ssid_len))
2105                 return 1;
2106
2107         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2108                 return 0;
2109
2110         hidden_ssid = 1;
2111         tmp = ssid_len;
2112         while (tmp--) {
2113                 if (ssid[tmp] != '\0') {
2114                         hidden_ssid = 0;
2115                         break;
2116                 }
2117         }
2118
2119         if (hidden_ssid && ifsta->ssid_len == ssid_len)
2120                 return 1;
2121
2122         if (ssid_len == 1 && ssid[0] == ' ')
2123                 return 1;
2124
2125         return 0;
2126 }
2127
2128 static int ieee80211_sta_config_auth(struct net_device *dev,
2129                                      struct ieee80211_if_sta *ifsta)
2130 {
2131         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2132         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2133         struct ieee80211_sta_bss *bss, *selected = NULL;
2134         int top_rssi = 0, freq;
2135
2136         if (!(ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2137             IEEE80211_STA_AUTO_BSSID_SEL | IEEE80211_STA_AUTO_CHANNEL_SEL))) {
2138                 ifsta->state = IEEE80211_AUTHENTICATE;
2139                 ieee80211_sta_reset_auth(dev, ifsta);
2140                 return 0;
2141         }
2142
2143         spin_lock_bh(&local->sta_bss_lock);
2144         freq = local->oper_channel->freq;
2145         list_for_each_entry(bss, &local->sta_bss_list, list) {
2146                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2147                         continue;
2148
2149                 if (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2150                     !!sdata->default_key)
2151                         continue;
2152
2153                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2154                     bss->freq != freq)
2155                         continue;
2156
2157                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2158                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2159                         continue;
2160
2161                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2162                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2163                         continue;
2164
2165                 if (!selected || top_rssi < bss->rssi) {
2166                         selected = bss;
2167                         top_rssi = bss->rssi;
2168                 }
2169         }
2170         if (selected)
2171                 atomic_inc(&selected->users);
2172         spin_unlock_bh(&local->sta_bss_lock);
2173
2174         if (selected) {
2175                 ieee80211_set_channel(local, -1, selected->freq);
2176                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2177                         ieee80211_sta_set_ssid(dev, selected->ssid,
2178                                                selected->ssid_len);
2179                 ieee80211_sta_set_bssid(dev, selected->bssid);
2180                 ieee80211_rx_bss_put(dev, selected);
2181                 ifsta->state = IEEE80211_AUTHENTICATE;
2182                 ieee80211_sta_reset_auth(dev, ifsta);
2183                 return 0;
2184         } else {
2185                 if (ifsta->state != IEEE80211_AUTHENTICATE) {
2186                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2187                                 ieee80211_sta_start_scan(dev, NULL, 0);
2188                         else
2189                                 ieee80211_sta_start_scan(dev, ifsta->ssid,
2190                                                          ifsta->ssid_len);
2191                         ifsta->state = IEEE80211_AUTHENTICATE;
2192                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2193                 } else
2194                         ifsta->state = IEEE80211_DISABLED;
2195         }
2196         return -1;
2197 }
2198
2199 static int ieee80211_sta_join_ibss(struct net_device *dev,
2200                                    struct ieee80211_if_sta *ifsta,
2201                                    struct ieee80211_sta_bss *bss)
2202 {
2203         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2204         int res, rates, i, j;
2205         struct sk_buff *skb;
2206         struct ieee80211_mgmt *mgmt;
2207         struct ieee80211_tx_control control;
2208         struct ieee80211_rate *rate;
2209         struct ieee80211_hw_mode *mode;
2210         struct rate_control_extra extra;
2211         u8 *pos;
2212         struct ieee80211_sub_if_data *sdata;
2213
2214         /* Remove possible STA entries from other IBSS networks. */
2215         sta_info_flush(local, NULL);
2216
2217         if (local->ops->reset_tsf) {
2218                 /* Reset own TSF to allow time synchronization work. */
2219                 local->ops->reset_tsf(local_to_hw(local));
2220         }
2221         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2222         res = ieee80211_if_config(dev);
2223         if (res)
2224                 return res;
2225
2226         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2227
2228         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2229         sdata->drop_unencrypted = bss->capability &
2230                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2231
2232         res = ieee80211_set_channel(local, -1, bss->freq);
2233
2234         if (!(local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)) {
2235                 printk(KERN_DEBUG "%s: IBSS not allowed on channel %d "
2236                        "(%d MHz)\n", dev->name, local->hw.conf.channel,
2237                        local->hw.conf.freq);
2238                 return -1;
2239         }
2240
2241         /* Set beacon template based on scan results */
2242         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2243         do {
2244                 if (!skb)
2245                         break;
2246
2247                 skb_reserve(skb, local->hw.extra_tx_headroom);
2248
2249                 mgmt = (struct ieee80211_mgmt *)
2250                         skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2251                 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2252                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2253                                                    IEEE80211_STYPE_BEACON);
2254                 memset(mgmt->da, 0xff, ETH_ALEN);
2255                 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
2256                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2257                 mgmt->u.beacon.beacon_int =
2258                         cpu_to_le16(local->hw.conf.beacon_int);
2259                 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2260
2261                 pos = skb_put(skb, 2 + ifsta->ssid_len);
2262                 *pos++ = WLAN_EID_SSID;
2263                 *pos++ = ifsta->ssid_len;
2264                 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2265
2266                 rates = bss->supp_rates_len;
2267                 if (rates > 8)
2268                         rates = 8;
2269                 pos = skb_put(skb, 2 + rates);
2270                 *pos++ = WLAN_EID_SUPP_RATES;
2271                 *pos++ = rates;
2272                 memcpy(pos, bss->supp_rates, rates);
2273
2274                 pos = skb_put(skb, 2 + 1);
2275                 *pos++ = WLAN_EID_DS_PARAMS;
2276                 *pos++ = 1;
2277                 *pos++ = bss->channel;
2278
2279                 pos = skb_put(skb, 2 + 2);
2280                 *pos++ = WLAN_EID_IBSS_PARAMS;
2281                 *pos++ = 2;
2282                 /* FIX: set ATIM window based on scan results */
2283                 *pos++ = 0;
2284                 *pos++ = 0;
2285
2286                 if (bss->supp_rates_len > 8) {
2287                         rates = bss->supp_rates_len - 8;
2288                         pos = skb_put(skb, 2 + rates);
2289                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
2290                         *pos++ = rates;
2291                         memcpy(pos, &bss->supp_rates[8], rates);
2292                 }
2293
2294                 memset(&control, 0, sizeof(control));
2295                 memset(&extra, 0, sizeof(extra));
2296                 extra.mode = local->oper_hw_mode;
2297                 rate = rate_control_get_rate(local, dev, skb, &extra);
2298                 if (!rate) {
2299                         printk(KERN_DEBUG "%s: Failed to determine TX rate "
2300                                "for IBSS beacon\n", dev->name);
2301                         break;
2302                 }
2303                 control.tx_rate =
2304                         ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
2305                         (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
2306                         rate->val2 : rate->val;
2307                 control.antenna_sel_tx = local->hw.conf.antenna_sel_tx;
2308                 control.power_level = local->hw.conf.power_level;
2309                 control.flags |= IEEE80211_TXCTL_NO_ACK;
2310                 control.retry_limit = 1;
2311
2312                 ifsta->probe_resp = skb_copy(skb, GFP_ATOMIC);
2313                 if (ifsta->probe_resp) {
2314                         mgmt = (struct ieee80211_mgmt *)
2315                                 ifsta->probe_resp->data;
2316                         mgmt->frame_control =
2317                                 IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2318                                              IEEE80211_STYPE_PROBE_RESP);
2319                 } else {
2320                         printk(KERN_DEBUG "%s: Could not allocate ProbeResp "
2321                                "template for IBSS\n", dev->name);
2322                 }
2323
2324                 if (local->ops->beacon_update &&
2325                     local->ops->beacon_update(local_to_hw(local),
2326                                              skb, &control) == 0) {
2327                         printk(KERN_DEBUG "%s: Configured IBSS beacon "
2328                                "template based on scan results\n", dev->name);
2329                         skb = NULL;
2330                 }
2331
2332                 rates = 0;
2333                 mode = local->oper_hw_mode;
2334                 for (i = 0; i < bss->supp_rates_len; i++) {
2335                         int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2336                         for (j = 0; j < mode->num_rates; j++)
2337                                 if (mode->rates[j].rate == bitrate)
2338                                         rates |= BIT(j);
2339                 }
2340                 ifsta->supp_rates_bits = rates;
2341         } while (0);
2342
2343         if (skb) {
2344                 printk(KERN_DEBUG "%s: Failed to configure IBSS beacon "
2345                        "template\n", dev->name);
2346                 dev_kfree_skb(skb);
2347         }
2348
2349         ifsta->state = IEEE80211_IBSS_JOINED;
2350         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2351
2352         ieee80211_rx_bss_put(dev, bss);
2353
2354         return res;
2355 }
2356
2357
2358 static int ieee80211_sta_create_ibss(struct net_device *dev,
2359                                      struct ieee80211_if_sta *ifsta)
2360 {
2361         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2362         struct ieee80211_sta_bss *bss;
2363         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2364         struct ieee80211_hw_mode *mode;
2365         u8 bssid[ETH_ALEN], *pos;
2366         int i;
2367         DECLARE_MAC_BUF(mac);
2368
2369 #if 0
2370         /* Easier testing, use fixed BSSID. */
2371         memset(bssid, 0xfe, ETH_ALEN);
2372 #else
2373         /* Generate random, not broadcast, locally administered BSSID. Mix in
2374          * own MAC address to make sure that devices that do not have proper
2375          * random number generator get different BSSID. */
2376         get_random_bytes(bssid, ETH_ALEN);
2377         for (i = 0; i < ETH_ALEN; i++)
2378                 bssid[i] ^= dev->dev_addr[i];
2379         bssid[0] &= ~0x01;
2380         bssid[0] |= 0x02;
2381 #endif
2382
2383         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
2384                dev->name, print_mac(mac, bssid));
2385
2386         bss = ieee80211_rx_bss_add(dev, bssid, local->hw.conf.channel,
2387                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2388         if (!bss)
2389                 return -ENOMEM;
2390
2391         mode = local->oper_hw_mode;
2392
2393         if (local->hw.conf.beacon_int == 0)
2394                 local->hw.conf.beacon_int = 100;
2395         bss->beacon_int = local->hw.conf.beacon_int;
2396         bss->hw_mode = local->hw.conf.phymode;
2397         bss->freq = local->hw.conf.freq;
2398         bss->last_update = jiffies;
2399         bss->capability = WLAN_CAPABILITY_IBSS;
2400         if (sdata->default_key) {
2401                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2402         } else
2403                 sdata->drop_unencrypted = 0;
2404         bss->supp_rates_len = mode->num_rates;
2405         pos = bss->supp_rates;
2406         for (i = 0; i < mode->num_rates; i++) {
2407                 int rate = mode->rates[i].rate;
2408                 *pos++ = (u8) (rate / 5);
2409         }
2410
2411         return ieee80211_sta_join_ibss(dev, ifsta, bss);
2412 }
2413
2414
2415 static int ieee80211_sta_find_ibss(struct net_device *dev,
2416                                    struct ieee80211_if_sta *ifsta)
2417 {
2418         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2419         struct ieee80211_sta_bss *bss;
2420         int found = 0;
2421         u8 bssid[ETH_ALEN];
2422         int active_ibss;
2423         DECLARE_MAC_BUF(mac);
2424         DECLARE_MAC_BUF(mac2);
2425
2426         if (ifsta->ssid_len == 0)
2427                 return -EINVAL;
2428
2429         active_ibss = ieee80211_sta_active_ibss(dev);
2430 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2431         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2432                dev->name, active_ibss);
2433 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2434         spin_lock_bh(&local->sta_bss_lock);
2435         list_for_each_entry(bss, &local->sta_bss_list, list) {
2436                 if (ifsta->ssid_len != bss->ssid_len ||
2437                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2438                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2439                         continue;
2440 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2441                 printk(KERN_DEBUG "   bssid=%s found\n",
2442                        print_mac(mac, bss->bssid));
2443 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2444                 memcpy(bssid, bss->bssid, ETH_ALEN);
2445                 found = 1;
2446                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2447                         break;
2448         }
2449         spin_unlock_bh(&local->sta_bss_lock);
2450
2451 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2452         printk(KERN_DEBUG "   sta_find_ibss: selected %s current "
2453                "%s\n", print_mac(mac, bssid), print_mac(mac2, ifsta->bssid));
2454 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2455         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
2456             (bss = ieee80211_rx_bss_get(dev, bssid, local->hw.conf.channel,
2457                                         ifsta->ssid, ifsta->ssid_len))) {
2458                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
2459                        " based on configured SSID\n",
2460                        dev->name, print_mac(mac, bssid));
2461                 return ieee80211_sta_join_ibss(dev, ifsta, bss);
2462         }
2463 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2464         printk(KERN_DEBUG "   did not try to join ibss\n");
2465 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2466
2467         /* Selected IBSS not found in current scan results - try to scan */
2468         if (ifsta->state == IEEE80211_IBSS_JOINED &&
2469             !ieee80211_sta_active_ibss(dev)) {
2470                 mod_timer(&ifsta->timer, jiffies +
2471                                       IEEE80211_IBSS_MERGE_INTERVAL);
2472         } else if (time_after(jiffies, local->last_scan_completed +
2473                               IEEE80211_SCAN_INTERVAL)) {
2474                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2475                        "join\n", dev->name);
2476                 return ieee80211_sta_req_scan(dev, ifsta->ssid,
2477                                               ifsta->ssid_len);
2478         } else if (ifsta->state != IEEE80211_IBSS_JOINED) {
2479                 int interval = IEEE80211_SCAN_INTERVAL;
2480
2481                 if (time_after(jiffies, ifsta->ibss_join_req +
2482                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2483                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2484                             local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)
2485                                 return ieee80211_sta_create_ibss(dev, ifsta);
2486                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2487                                 printk(KERN_DEBUG "%s: IBSS not allowed on the"
2488                                        " configured channel %d (%d MHz)\n",
2489                                        dev->name, local->hw.conf.channel,
2490                                        local->hw.conf.freq);
2491                         }
2492
2493                         /* No IBSS found - decrease scan interval and continue
2494                          * scanning. */
2495                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2496                 }
2497
2498                 ifsta->state = IEEE80211_IBSS_SEARCH;
2499                 mod_timer(&ifsta->timer, jiffies + interval);
2500                 return 0;
2501         }
2502
2503         return 0;
2504 }
2505
2506
2507 int ieee80211_sta_set_ssid(struct net_device *dev, char *ssid, size_t len)
2508 {
2509         struct ieee80211_sub_if_data *sdata;
2510         struct ieee80211_if_sta *ifsta;
2511         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2512
2513         if (len > IEEE80211_MAX_SSID_LEN)
2514                 return -EINVAL;
2515
2516         /* TODO: This should always be done for IBSS, even if IEEE80211_QOS is
2517          * not defined. */
2518         if (local->ops->conf_tx) {
2519                 struct ieee80211_tx_queue_params qparam;
2520                 int i;
2521
2522                 memset(&qparam, 0, sizeof(qparam));
2523                 /* TODO: are these ok defaults for all hw_modes? */
2524                 qparam.aifs = 2;
2525                 qparam.cw_min =
2526                         local->hw.conf.phymode == MODE_IEEE80211B ? 31 : 15;
2527                 qparam.cw_max = 1023;
2528                 qparam.burst_time = 0;
2529                 for (i = IEEE80211_TX_QUEUE_DATA0; i < NUM_TX_DATA_QUEUES; i++)
2530                 {
2531                         local->ops->conf_tx(local_to_hw(local),
2532                                            i + IEEE80211_TX_QUEUE_DATA0,
2533                                            &qparam);
2534                 }
2535                 /* IBSS uses different parameters for Beacon sending */
2536                 qparam.cw_min++;
2537                 qparam.cw_min *= 2;
2538                 qparam.cw_min--;
2539                 local->ops->conf_tx(local_to_hw(local),
2540                                    IEEE80211_TX_QUEUE_BEACON, &qparam);
2541         }
2542
2543         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2544         ifsta = &sdata->u.sta;
2545
2546         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0)
2547                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2548         memcpy(ifsta->ssid, ssid, len);
2549         memset(ifsta->ssid + len, 0, IEEE80211_MAX_SSID_LEN - len);
2550         ifsta->ssid_len = len;
2551
2552         if (len)
2553                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2554         else
2555                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2556         if (sdata->type == IEEE80211_IF_TYPE_IBSS &&
2557             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2558                 ifsta->ibss_join_req = jiffies;
2559                 ifsta->state = IEEE80211_IBSS_SEARCH;
2560                 return ieee80211_sta_find_ibss(dev, ifsta);
2561         }
2562         return 0;
2563 }
2564
2565
2566 int ieee80211_sta_get_ssid(struct net_device *dev, char *ssid, size_t *len)
2567 {
2568         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2569         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2570         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2571         *len = ifsta->ssid_len;
2572         return 0;
2573 }
2574
2575
2576 int ieee80211_sta_set_bssid(struct net_device *dev, u8 *bssid)
2577 {
2578         struct ieee80211_sub_if_data *sdata;
2579         struct ieee80211_if_sta *ifsta;
2580         int res;
2581
2582         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2583         ifsta = &sdata->u.sta;
2584
2585         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2586                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2587                 res = ieee80211_if_config(dev);
2588                 if (res) {
2589                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2590                                "the low-level driver\n", dev->name);
2591                         return res;
2592                 }
2593         }
2594
2595         if (is_valid_ether_addr(bssid))
2596                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2597         else
2598                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2599
2600         return 0;
2601 }
2602
2603
2604 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
2605                                     struct ieee80211_sub_if_data *sdata,
2606                                     int powersave)
2607 {
2608         struct sk_buff *skb;
2609         struct ieee80211_hdr *nullfunc;
2610         u16 fc;
2611
2612         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2613         if (!skb) {
2614                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2615                        "frame\n", sdata->dev->name);
2616                 return;
2617         }
2618         skb_reserve(skb, local->hw.extra_tx_headroom);
2619
2620         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2621         memset(nullfunc, 0, 24);
2622         fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2623              IEEE80211_FCTL_TODS;
2624         if (powersave)
2625                 fc |= IEEE80211_FCTL_PM;
2626         nullfunc->frame_control = cpu_to_le16(fc);
2627         memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
2628         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2629         memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
2630
2631         ieee80211_sta_tx(sdata->dev, skb, 0);
2632 }
2633
2634
2635 void ieee80211_scan_completed(struct ieee80211_hw *hw)
2636 {
2637         struct ieee80211_local *local = hw_to_local(hw);
2638         struct net_device *dev = local->scan_dev;
2639         struct ieee80211_sub_if_data *sdata;
2640         union iwreq_data wrqu;
2641
2642         local->last_scan_completed = jiffies;
2643         wmb();
2644         local->sta_scanning = 0;
2645
2646         if (ieee80211_hw_config(local))
2647                 printk(KERN_DEBUG "%s: failed to restore operational"
2648                        "channel after scan\n", dev->name);
2649
2650
2651         netif_tx_lock_bh(local->mdev);
2652         local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
2653         local->ops->configure_filter(local_to_hw(local),
2654                                      FIF_BCN_PRBRESP_PROMISC,
2655                                      &local->filter_flags,
2656                                      local->mdev->mc_count,
2657                                      local->mdev->mc_list);
2658
2659         netif_tx_unlock_bh(local->mdev);
2660
2661         memset(&wrqu, 0, sizeof(wrqu));
2662         wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
2663
2664         rcu_read_lock();
2665         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2666
2667                 /* No need to wake the master device. */
2668                 if (sdata->dev == local->mdev)
2669                         continue;
2670
2671                 if (sdata->type == IEEE80211_IF_TYPE_STA) {
2672                         if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED)
2673                                 ieee80211_send_nullfunc(local, sdata, 0);
2674                         ieee80211_sta_timer((unsigned long)sdata);
2675                 }
2676
2677                 netif_wake_queue(sdata->dev);
2678         }
2679         rcu_read_unlock();
2680
2681         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2682         if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
2683                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2684                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2685                     (!ifsta->state == IEEE80211_IBSS_JOINED &&
2686                     !ieee80211_sta_active_ibss(dev)))
2687                         ieee80211_sta_find_ibss(dev, ifsta);
2688         }
2689 }
2690 EXPORT_SYMBOL(ieee80211_scan_completed);
2691
2692 void ieee80211_sta_scan_work(struct work_struct *work)
2693 {
2694         struct ieee80211_local *local =
2695                 container_of(work, struct ieee80211_local, scan_work.work);
2696         struct net_device *dev = local->scan_dev;
2697         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2698         struct ieee80211_hw_mode *mode;
2699         struct ieee80211_channel *chan;
2700         int skip;
2701         unsigned long next_delay = 0;
2702
2703         if (!local->sta_scanning)
2704                 return;
2705
2706         switch (local->scan_state) {
2707         case SCAN_SET_CHANNEL:
2708                 mode = local->scan_hw_mode;
2709                 if (local->scan_hw_mode->list.next == &local->modes_list &&
2710                     local->scan_channel_idx >= mode->num_channels) {
2711                         ieee80211_scan_completed(local_to_hw(local));
2712                         return;
2713                 }
2714                 skip = !(local->enabled_modes & (1 << mode->mode));
2715                 chan = &mode->channels[local->scan_channel_idx];
2716                 if (!(chan->flag & IEEE80211_CHAN_W_SCAN) ||
2717                     (sdata->type == IEEE80211_IF_TYPE_IBSS &&
2718                      !(chan->flag & IEEE80211_CHAN_W_IBSS)) ||
2719                     (local->hw_modes & local->enabled_modes &
2720                      (1 << MODE_IEEE80211G) && mode->mode == MODE_IEEE80211B))
2721                         skip = 1;
2722
2723                 if (!skip) {
2724 #if 0
2725                         printk(KERN_DEBUG "%s: scan channel %d (%d MHz)\n",
2726                                dev->name, chan->chan, chan->freq);
2727 #endif
2728
2729                         local->scan_channel = chan;
2730                         if (ieee80211_hw_config(local)) {
2731                                 printk(KERN_DEBUG "%s: failed to set channel "
2732                                        "%d (%d MHz) for scan\n", dev->name,
2733                                        chan->chan, chan->freq);
2734                                 skip = 1;
2735                         }
2736                 }
2737
2738                 local->scan_channel_idx++;
2739                 if (local->scan_channel_idx >= local->scan_hw_mode->num_channels) {
2740                         if (local->scan_hw_mode->list.next != &local->modes_list) {
2741                                 local->scan_hw_mode = list_entry(local->scan_hw_mode->list.next,
2742                                                                  struct ieee80211_hw_mode,
2743                                                                  list);
2744                                 local->scan_channel_idx = 0;
2745                         }
2746                 }
2747
2748                 if (skip)
2749                         break;
2750
2751                 next_delay = IEEE80211_PROBE_DELAY +
2752                              usecs_to_jiffies(local->hw.channel_change_time);
2753                 local->scan_state = SCAN_SEND_PROBE;
2754                 break;
2755         case SCAN_SEND_PROBE:
2756                 if (local->scan_channel->flag & IEEE80211_CHAN_W_ACTIVE_SCAN) {
2757                         ieee80211_send_probe_req(dev, NULL, local->scan_ssid,
2758                                                  local->scan_ssid_len);
2759                         next_delay = IEEE80211_CHANNEL_TIME;
2760                 } else
2761                         next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
2762                 local->scan_state = SCAN_SET_CHANNEL;
2763                 break;
2764         }
2765
2766         if (local->sta_scanning)
2767                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2768                                    next_delay);
2769 }
2770
2771
2772 static int ieee80211_sta_start_scan(struct net_device *dev,
2773                                     u8 *ssid, size_t ssid_len)
2774 {
2775         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2776         struct ieee80211_sub_if_data *sdata;
2777
2778         if (ssid_len > IEEE80211_MAX_SSID_LEN)
2779                 return -EINVAL;
2780
2781         /* MLME-SCAN.request (page 118)  page 144 (11.1.3.1)
2782          * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
2783          * BSSID: MACAddress
2784          * SSID
2785          * ScanType: ACTIVE, PASSIVE
2786          * ProbeDelay: delay (in microseconds) to be used prior to transmitting
2787          *    a Probe frame during active scanning
2788          * ChannelList
2789          * MinChannelTime (>= ProbeDelay), in TU
2790          * MaxChannelTime: (>= MinChannelTime), in TU
2791          */
2792
2793          /* MLME-SCAN.confirm
2794           * BSSDescriptionSet
2795           * ResultCode: SUCCESS, INVALID_PARAMETERS
2796          */
2797
2798         if (local->sta_scanning) {
2799                 if (local->scan_dev == dev)
2800                         return 0;
2801                 return -EBUSY;
2802         }
2803
2804         if (local->ops->hw_scan) {
2805                 int rc = local->ops->hw_scan(local_to_hw(local),
2806                                             ssid, ssid_len);
2807                 if (!rc) {
2808                         local->sta_scanning = 1;
2809                         local->scan_dev = dev;
2810                 }
2811                 return rc;
2812         }
2813
2814         local->sta_scanning = 1;
2815
2816         rcu_read_lock();
2817         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2818
2819                 /* Don't stop the master interface, otherwise we can't transmit
2820                  * probes! */
2821                 if (sdata->dev == local->mdev)
2822                         continue;
2823
2824                 netif_stop_queue(sdata->dev);
2825                 if (sdata->type == IEEE80211_IF_TYPE_STA &&
2826                     (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED))
2827                         ieee80211_send_nullfunc(local, sdata, 1);
2828         }
2829         rcu_read_unlock();
2830
2831         if (ssid) {
2832                 local->scan_ssid_len = ssid_len;
2833                 memcpy(local->scan_ssid, ssid, ssid_len);
2834         } else
2835                 local->scan_ssid_len = 0;
2836         local->scan_state = SCAN_SET_CHANNEL;
2837         local->scan_hw_mode = list_entry(local->modes_list.next,
2838                                          struct ieee80211_hw_mode,
2839                                          list);
2840         local->scan_channel_idx = 0;
2841         local->scan_dev = dev;
2842
2843         netif_tx_lock_bh(local->mdev);
2844         local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
2845         local->ops->configure_filter(local_to_hw(local),
2846                                      FIF_BCN_PRBRESP_PROMISC,
2847                                      &local->filter_flags,
2848                                      local->mdev->mc_count,
2849                                      local->mdev->mc_list);
2850         netif_tx_unlock_bh(local->mdev);
2851
2852         /* TODO: start scan as soon as all nullfunc frames are ACKed */
2853         queue_delayed_work(local->hw.workqueue, &local->scan_work,
2854                            IEEE80211_CHANNEL_TIME);
2855
2856         return 0;
2857 }
2858
2859
2860 int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
2861 {
2862         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2863         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2864         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2865
2866         if (sdata->type != IEEE80211_IF_TYPE_STA)
2867                 return ieee80211_sta_start_scan(dev, ssid, ssid_len);
2868
2869         if (local->sta_scanning) {
2870                 if (local->scan_dev == dev)
2871                         return 0;
2872                 return -EBUSY;
2873         }
2874
2875         set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
2876         queue_work(local->hw.workqueue, &ifsta->work);
2877         return 0;
2878 }
2879
2880 static char *
2881 ieee80211_sta_scan_result(struct net_device *dev,
2882                           struct ieee80211_sta_bss *bss,
2883                           char *current_ev, char *end_buf)
2884 {
2885         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2886         struct iw_event iwe;
2887
2888         if (time_after(jiffies,
2889                        bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
2890                 return current_ev;
2891
2892         if (!(local->enabled_modes & (1 << bss->hw_mode)))
2893                 return current_ev;
2894
2895         if (local->scan_flags & IEEE80211_SCAN_WPA_ONLY &&
2896             !bss->wpa_ie && !bss->rsn_ie)
2897                 return current_ev;
2898
2899         if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID &&
2900             (local->scan_ssid_len != bss->ssid_len ||
2901              memcmp(local->scan_ssid, bss->ssid, bss->ssid_len) != 0))
2902                 return current_ev;
2903
2904         memset(&iwe, 0, sizeof(iwe));
2905         iwe.cmd = SIOCGIWAP;
2906         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2907         memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2908         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2909                                           IW_EV_ADDR_LEN);
2910
2911         memset(&iwe, 0, sizeof(iwe));
2912         iwe.cmd = SIOCGIWESSID;
2913         iwe.u.data.length = bss->ssid_len;
2914         iwe.u.data.flags = 1;
2915         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2916                                           bss->ssid);
2917
2918         if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)) {
2919                 memset(&iwe, 0, sizeof(iwe));
2920                 iwe.cmd = SIOCGIWMODE;
2921                 if (bss->capability & WLAN_CAPABILITY_ESS)
2922                         iwe.u.mode = IW_MODE_MASTER;
2923                 else
2924                         iwe.u.mode = IW_MODE_ADHOC;
2925                 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2926                                                   IW_EV_UINT_LEN);
2927         }
2928
2929         memset(&iwe, 0, sizeof(iwe));
2930         iwe.cmd = SIOCGIWFREQ;
2931         iwe.u.freq.m = bss->channel;
2932         iwe.u.freq.e = 0;
2933         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2934                                           IW_EV_FREQ_LEN);
2935         iwe.u.freq.m = bss->freq * 100000;
2936         iwe.u.freq.e = 1;
2937         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2938                                           IW_EV_FREQ_LEN);
2939
2940         memset(&iwe, 0, sizeof(iwe));
2941         iwe.cmd = IWEVQUAL;
2942         iwe.u.qual.qual = bss->signal;
2943         iwe.u.qual.level = bss->rssi;
2944         iwe.u.qual.noise = bss->noise;
2945         iwe.u.qual.updated = local->wstats_flags;
2946         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2947                                           IW_EV_QUAL_LEN);
2948
2949         memset(&iwe, 0, sizeof(iwe));
2950         iwe.cmd = SIOCGIWENCODE;
2951         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
2952                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2953         else
2954                 iwe.u.data.flags = IW_ENCODE_DISABLED;
2955         iwe.u.data.length = 0;
2956         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, "");
2957
2958         if (bss && bss->wpa_ie) {
2959                 memset(&iwe, 0, sizeof(iwe));
2960                 iwe.cmd = IWEVGENIE;
2961                 iwe.u.data.length = bss->wpa_ie_len;
2962                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2963                                                   bss->wpa_ie);
2964         }
2965
2966         if (bss && bss->rsn_ie) {
2967                 memset(&iwe, 0, sizeof(iwe));
2968                 iwe.cmd = IWEVGENIE;
2969                 iwe.u.data.length = bss->rsn_ie_len;
2970                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2971                                                   bss->rsn_ie);
2972         }
2973
2974         if (bss && bss->supp_rates_len > 0) {
2975                 /* display all supported rates in readable format */
2976                 char *p = current_ev + IW_EV_LCP_LEN;
2977                 int i;
2978
2979                 memset(&iwe, 0, sizeof(iwe));
2980                 iwe.cmd = SIOCGIWRATE;
2981                 /* Those two flags are ignored... */
2982                 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2983
2984                 for (i = 0; i < bss->supp_rates_len; i++) {
2985                         iwe.u.bitrate.value = ((bss->supp_rates[i] &
2986                                                         0x7f) * 500000);
2987                         p = iwe_stream_add_value(current_ev, p,
2988                                         end_buf, &iwe, IW_EV_PARAM_LEN);
2989                 }
2990                 current_ev = p;
2991         }
2992
2993         if (bss) {
2994                 char *buf;
2995                 buf = kmalloc(30, GFP_ATOMIC);
2996                 if (buf) {
2997                         memset(&iwe, 0, sizeof(iwe));
2998                         iwe.cmd = IWEVCUSTOM;
2999                         sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
3000                         iwe.u.data.length = strlen(buf);
3001                         current_ev = iwe_stream_add_point(current_ev, end_buf,
3002                                                           &iwe, buf);
3003                         kfree(buf);
3004                 }
3005         }
3006
3007         do {
3008                 char *buf;
3009
3010                 if (!(local->scan_flags & IEEE80211_SCAN_EXTRA_INFO))
3011                         break;
3012
3013                 buf = kmalloc(100, GFP_ATOMIC);
3014                 if (!buf)
3015                         break;
3016
3017                 memset(&iwe, 0, sizeof(iwe));
3018                 iwe.cmd = IWEVCUSTOM;
3019                 sprintf(buf, "bcn_int=%d", bss->beacon_int);
3020                 iwe.u.data.length = strlen(buf);
3021                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3022                                                   buf);
3023
3024                 memset(&iwe, 0, sizeof(iwe));
3025                 iwe.cmd = IWEVCUSTOM;
3026                 sprintf(buf, "capab=0x%04x", bss->capability);
3027                 iwe.u.data.length = strlen(buf);
3028                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3029                                                   buf);
3030
3031                 kfree(buf);
3032                 break;
3033         } while (0);
3034
3035         return current_ev;
3036 }
3037
3038
3039 int ieee80211_sta_scan_results(struct net_device *dev, char *buf, size_t len)
3040 {
3041         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3042         char *current_ev = buf;
3043         char *end_buf = buf + len;
3044         struct ieee80211_sta_bss *bss;
3045
3046         spin_lock_bh(&local->sta_bss_lock);
3047         list_for_each_entry(bss, &local->sta_bss_list, list) {
3048                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3049                         spin_unlock_bh(&local->sta_bss_lock);
3050                         return -E2BIG;
3051                 }
3052                 current_ev = ieee80211_sta_scan_result(dev, bss, current_ev,
3053                                                        end_buf);
3054         }
3055         spin_unlock_bh(&local->sta_bss_lock);
3056         return current_ev - buf;
3057 }
3058
3059
3060 int ieee80211_sta_set_extra_ie(struct net_device *dev, char *ie, size_t len)
3061 {
3062         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3063         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3064         kfree(ifsta->extra_ie);
3065         if (len == 0) {
3066                 ifsta->extra_ie = NULL;
3067                 ifsta->extra_ie_len = 0;
3068                 return 0;
3069         }
3070         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
3071         if (!ifsta->extra_ie) {
3072                 ifsta->extra_ie_len = 0;
3073                 return -ENOMEM;
3074         }
3075         memcpy(ifsta->extra_ie, ie, len);
3076         ifsta->extra_ie_len = len;
3077         return 0;
3078 }
3079
3080
3081 struct sta_info * ieee80211_ibss_add_sta(struct net_device *dev,
3082                                          struct sk_buff *skb, u8 *bssid,
3083                                          u8 *addr)
3084 {
3085         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3086         struct sta_info *sta;
3087         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3088         DECLARE_MAC_BUF(mac);
3089
3090         /* TODO: Could consider removing the least recently used entry and
3091          * allow new one to be added. */
3092         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
3093                 if (net_ratelimit()) {
3094                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
3095                                "entry %s\n", dev->name, print_mac(mac, addr));
3096                 }
3097                 return NULL;
3098         }
3099
3100         printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
3101                wiphy_name(local->hw.wiphy), print_mac(mac, addr), dev->name);
3102
3103         sta = sta_info_add(local, dev, addr, GFP_ATOMIC);
3104         if (!sta)
3105                 return NULL;
3106
3107         sta->supp_rates = sdata->u.sta.supp_rates_bits;
3108
3109         rate_control_rate_init(sta, local);
3110
3111         return sta; /* caller will call sta_info_put() */
3112 }
3113
3114
3115 int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason)
3116 {
3117         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3118         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3119
3120         printk(KERN_DEBUG "%s: deauthenticate(reason=%d)\n",
3121                dev->name, reason);
3122
3123         if (sdata->type != IEEE80211_IF_TYPE_STA &&
3124             sdata->type != IEEE80211_IF_TYPE_IBSS)
3125                 return -EINVAL;
3126
3127         ieee80211_send_deauth(dev, ifsta, reason);
3128         ieee80211_set_disassoc(dev, ifsta, 1);
3129         return 0;
3130 }
3131
3132
3133 int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
3134 {
3135         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3136         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3137
3138         printk(KERN_DEBUG "%s: disassociate(reason=%d)\n",
3139                dev->name, reason);
3140
3141         if (sdata->type != IEEE80211_IF_TYPE_STA)
3142                 return -EINVAL;
3143
3144         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
3145                 return -1;
3146
3147         ieee80211_send_disassoc(dev, ifsta, reason);
3148         ieee80211_set_disassoc(dev, ifsta, 0);
3149         return 0;
3150 }