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  * BSS table: use <BSSID,SSID> as the key to support multi-SSID APs
  16  * order BSS list by RSSI(?) ("quality of AP")
  17  * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
  18  *    SSID)
  19  */
  20 #include <linux/delay.h>
  21 #include <linux/if_ether.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/if_arp.h>
  25 #include <linux/wireless.h>
  26 #include <linux/random.h>
  27 #include <linux/etherdevice.h>
  28 #include <net/iw_handler.h>
  29 #include <asm/types.h>
  30
  31 #include <net/mac80211.h>
  32 #include "ieee80211_i.h"
  33 #include "ieee80211_rate.h"
  34 #include "hostapd_ioctl.h"
  35
  36 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  37 #define IEEE80211_AUTH_MAX_TRIES 3
  38 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  39 #define IEEE80211_ASSOC_MAX_TRIES 3
  40 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  41 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  42 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  43 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  44 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  45 #define IEEE80211_IBSS_JOIN_TIMEOUT (20 * HZ)
  46
  47 #define IEEE80211_PROBE_DELAY (HZ / 33)
  48 #define IEEE80211_CHANNEL_TIME (HZ / 33)
  49 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
  50 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
  51 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  52 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  53
  54 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  55
  56
  57 #define IEEE80211_FC(type, stype) cpu_to_le16(type | stype)
  58
  59 #define ERP_INFO_USE_PROTECTION BIT(1)
  60
  61 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
  62                                      u8 *ssid, size_t ssid_len);
  63 static struct ieee80211_sta_bss *
  64 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid);
  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 typedef enum { ParseOK = 0, ParseUnknown = 1, ParseFailed = -1 } ParseRes;
 112
 113
 114 static ParseRes ieee802_11_parse_elems(u8 *start, size_t len,
 115                                        struct ieee802_11_elems *elems)
 116 {
 117         size_t left = len;
 118         u8 *pos = start;
 119         int unknown = 0;
 120
 121         memset(elems, 0, sizeof(*elems));
 122
 123         while (left >= 2) {
 124                 u8 id, elen;
 125
 126                 id = *pos++;
 127                 elen = *pos++;
 128                 left -= 2;
 129
 130                 if (elen > left) {
 131 #if 0
 132                         if (net_ratelimit())
 133                                 printk(KERN_DEBUG "IEEE 802.11 element parse "
 134                                        "failed (id=%d elen=%d left=%d)\n",
 135                                        id, elen, left);
 136 #endif
 137                         return ParseFailed;
 138                 }
 139
 140                 switch (id) {
 141                 case WLAN_EID_SSID:
 142                         elems->ssid = pos;
 143                         elems->ssid_len = elen;
 144                         break;
 145                 case WLAN_EID_SUPP_RATES:
 146                         elems->supp_rates = pos;
 147                         elems->supp_rates_len = elen;
 148                         break;
 149                 case WLAN_EID_FH_PARAMS:
 150                         elems->fh_params = pos;
 151                         elems->fh_params_len = elen;
 152                         break;
 153                 case WLAN_EID_DS_PARAMS:
 154                         elems->ds_params = pos;
 155                         elems->ds_params_len = elen;
 156                         break;
 157                 case WLAN_EID_CF_PARAMS:
 158                         elems->cf_params = pos;
 159                         elems->cf_params_len = elen;
 160                         break;
 161                 case WLAN_EID_TIM:
 162                         elems->tim = pos;
 163                         elems->tim_len = elen;
 164                         break;
 165                 case WLAN_EID_IBSS_PARAMS:
 166                         elems->ibss_params = pos;
 167                         elems->ibss_params_len = elen;
 168                         break;
 169                 case WLAN_EID_CHALLENGE:
 170                         elems->challenge = pos;
 171                         elems->challenge_len = elen;
 172                         break;
 173                 case WLAN_EID_WPA:
 174                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 175                             pos[2] == 0xf2) {
 176                                 /* Microsoft OUI (00:50:F2) */
 177                                 if (pos[3] == 1) {
 178                                         /* OUI Type 1 - WPA IE */
 179                                         elems->wpa = pos;
 180                                         elems->wpa_len = elen;
 181                                 } else if (elen >= 5 && pos[3] == 2) {
 182                                         if (pos[4] == 0) {
 183                                                 elems->wmm_info = pos;
 184                                                 elems->wmm_info_len = elen;
 185                                         } else if (pos[4] == 1) {
 186                                                 elems->wmm_param = pos;
 187                                                 elems->wmm_param_len = elen;
 188                                         }
 189                                 }
 190                         }
 191                         break;
 192                 case WLAN_EID_RSN:
 193                         elems->rsn = pos;
 194                         elems->rsn_len = elen;
 195                         break;
 196                 case WLAN_EID_ERP_INFO:
 197                         elems->erp_info = pos;
 198                         elems->erp_info_len = elen;
 199                         break;
 200                 case WLAN_EID_EXT_SUPP_RATES:
 201                         elems->ext_supp_rates = pos;
 202                         elems->ext_supp_rates_len = elen;
 203                         break;
 204                 default:
 205 #if 0
 206                         printk(KERN_DEBUG "IEEE 802.11 element parse ignored "
 207                                       "unknown element (id=%d elen=%d)\n",
 208                                       id, elen);
 209 #endif
 210                         unknown++;
 211                         break;
 212                 }
 213
 214                 left -= elen;
 215                 pos += elen;
 216         }
 217
 218         /* Do not trigger error if left == 1 as Apple Airport base stations
 219          * send AssocResps that are one spurious byte too long. */
 220
 221         return unknown ? ParseUnknown : ParseOK;
 222 }
 223
 224
 225
 226
 227 static int ecw2cw(int ecw)
 228 {
 229         int cw = 1;
 230         while (ecw > 0) {
 231                 cw <<= 1;
 232                 ecw--;
 233         }
 234         return cw - 1;
 235 }
 236
 237
 238 static void ieee80211_sta_wmm_params(struct net_device *dev,
 239                                      struct ieee80211_if_sta *ifsta,
 240                                      u8 *wmm_param, size_t wmm_param_len)
 241 {
 242         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 243         struct ieee80211_tx_queue_params params;
 244         size_t left;
 245         int count;
 246         u8 *pos;
 247
 248         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 249                 return;
 250         count = wmm_param[6] & 0x0f;
 251         if (count == ifsta->wmm_last_param_set)
 252                 return;
 253         ifsta->wmm_last_param_set = count;
 254
 255         pos = wmm_param + 8;
 256         left = wmm_param_len - 8;
 257
 258         memset(&params, 0, sizeof(params));
 259
 260         if (!local->ops->conf_tx)
 261                 return;
 262
 263         local->wmm_acm = 0;
 264         for (; left >= 4; left -= 4, pos += 4) {
 265                 int aci = (pos[0] >> 5) & 0x03;
 266                 int acm = (pos[0] >> 4) & 0x01;
 267                 int queue;
 268
 269                 switch (aci) {
 270                 case 1:
 271                         queue = IEEE80211_TX_QUEUE_DATA3;
 272                         if (acm) {
 273                                 local->wmm_acm |= BIT(0) | BIT(3);
 274                         }
 275                         break;
 276                 case 2:
 277                         queue = IEEE80211_TX_QUEUE_DATA1;
 278                         if (acm) {
 279                                 local->wmm_acm |= BIT(4) | BIT(5);
 280                         }
 281                         break;
 282                 case 3:
 283                         queue = IEEE80211_TX_QUEUE_DATA0;
 284                         if (acm) {
 285                                 local->wmm_acm |= BIT(6) | BIT(7);
 286                         }
 287                         break;
 288                 case 0:
 289                 default:
 290                         queue = IEEE80211_TX_QUEUE_DATA2;
 291                         if (acm) {
 292                                 local->wmm_acm |= BIT(1) | BIT(2);
 293                         }
 294                         break;
 295                 }
 296
 297                 params.aifs = pos[0] & 0x0f;
 298                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 299                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 300                 /* TXOP is in units of 32 usec; burst_time in 0.1 ms */
 301                 params.burst_time = (pos[2] | (pos[3] << 8)) * 32 / 100;
 302                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 303                        "cWmin=%d cWmax=%d burst=%d\n",
 304                        dev->name, queue, aci, acm, params.aifs, params.cw_min,
 305                        params.cw_max, params.burst_time);
 306                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 307                  * AC for now) */
 308                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 309                         printk(KERN_DEBUG "%s: failed to set TX queue "
 310                                "parameters for queue %d\n", dev->name, queue);
 311                 }
 312         }
 313 }
 314
 315
 316 static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
 317 {
 318         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 319         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 320         int use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
 321
 322         if (use_protection != sdata->use_protection) {
 323                 if (net_ratelimit()) {
 324                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
 325                                MAC_FMT ")\n",
 326                                dev->name,
 327                                use_protection ? "enabled" : "disabled",
 328                                MAC_ARG(ifsta->bssid));
 329                 }
 330                 sdata->use_protection = use_protection;
 331         }
 332 }
 333
 334
 335 static void ieee80211_sta_send_associnfo(struct net_device *dev,
 336                                          struct ieee80211_if_sta *ifsta)
 337 {
 338         char *buf;
 339         size_t len;
 340         int i;
 341         union iwreq_data wrqu;
 342
 343         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 344                 return;
 345
 346         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 347                                 ifsta->assocresp_ies_len), GFP_ATOMIC);
 348         if (!buf)
 349                 return;
 350
 351         len = sprintf(buf, "ASSOCINFO(");
 352         if (ifsta->assocreq_ies) {
 353                 len += sprintf(buf + len, "ReqIEs=");
 354                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 355                         len += sprintf(buf + len, "%02x",
 356                                        ifsta->assocreq_ies[i]);
 357                 }
 358         }
 359         if (ifsta->assocresp_ies) {
 360                 if (ifsta->assocreq_ies)
 361                         len += sprintf(buf + len, " ");
 362                 len += sprintf(buf + len, "RespIEs=");
 363                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 364                         len += sprintf(buf + len, "%02x",
 365                                        ifsta->assocresp_ies[i]);
 366                 }
 367         }
 368         len += sprintf(buf + len, ")");
 369
 370         if (len > IW_CUSTOM_MAX) {
 371                 len = sprintf(buf, "ASSOCRESPIE=");
 372                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 373                         len += sprintf(buf + len, "%02x",
 374                                        ifsta->assocresp_ies[i]);
 375                 }
 376         }
 377
 378         memset(&wrqu, 0, sizeof(wrqu));
 379         wrqu.data.length = len;
 380         wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 381
 382         kfree(buf);
 383 }
 384
 385
 386 static void ieee80211_set_associated(struct net_device *dev,
 387                                      struct ieee80211_if_sta *ifsta, int assoc)
 388 {
 389         union iwreq_data wrqu;
 390         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 391
 392         if (ifsta->associated == assoc)
 393                 return;
 394
 395         ifsta->associated = assoc;
 396
 397         if (assoc) {
 398                 struct ieee80211_sub_if_data *sdata;
 399                 struct ieee80211_sta_bss *bss;
 400                 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 401                 if (sdata->type != IEEE80211_IF_TYPE_STA)
 402                         return;
 403
 404                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
 405                 if (bss) {
 406                         if (bss->has_erp_value)
 407                                 ieee80211_handle_erp_ie(dev, bss->erp_value);
 408                         ieee80211_rx_bss_put(dev, bss);
 409                 }
 410
 411                 netif_carrier_on(dev);
 412                 ifsta->prev_bssid_set = 1;
 413                 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 414                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 415                 ieee80211_sta_send_associnfo(dev, ifsta);
 416         } else {
 417                 netif_carrier_off(dev);
 418                 sdata->use_protection = 0;
 419                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 420         }
 421         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 422         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 423         ifsta->last_probe = jiffies;
 424 }
 425
 426 static void ieee80211_set_disassoc(struct net_device *dev,
 427                                    struct ieee80211_if_sta *ifsta, int deauth)
 428 {
 429         if (deauth)
 430                 ifsta->auth_tries = 0;
 431         ifsta->assoc_tries = 0;
 432         ieee80211_set_associated(dev, ifsta, 0);
 433 }
 434
 435 static void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
 436                              int encrypt)
 437 {
 438         struct ieee80211_sub_if_data *sdata;
 439         struct ieee80211_tx_packet_data *pkt_data;
 440
 441         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 442         skb->dev = sdata->local->mdev;
 443         skb_set_mac_header(skb, 0);
 444         skb_set_network_header(skb, 0);
 445         skb_set_transport_header(skb, 0);
 446
 447         pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 448         memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
 449         pkt_data->ifindex = sdata->dev->ifindex;
 450         pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
 451         pkt_data->do_not_encrypt = !encrypt;
 452
 453         dev_queue_xmit(skb);
 454 }
 455
 456
 457 static void ieee80211_send_auth(struct net_device *dev,
 458                                 struct ieee80211_if_sta *ifsta,
 459                                 int transaction, u8 *extra, size_t extra_len,
 460                                 int encrypt)
 461 {
 462         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 463         struct sk_buff *skb;
 464         struct ieee80211_mgmt *mgmt;
 465
 466         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 467                             sizeof(*mgmt) + 6 + extra_len);
 468         if (!skb) {
 469                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 470                        "frame\n", dev->name);
 471                 return;
 472         }
 473         skb_reserve(skb, local->hw.extra_tx_headroom);
 474
 475         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 476         memset(mgmt, 0, 24 + 6);
 477         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 478                                            IEEE80211_STYPE_AUTH);
 479         if (encrypt)
 480                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 481         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 482         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 483         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 484         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 485         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 486         ifsta->auth_transaction = transaction + 1;
 487         mgmt->u.auth.status_code = cpu_to_le16(0);
 488         if (extra)
 489                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 490
 491         ieee80211_sta_tx(dev, skb, encrypt);
 492 }
 493
 494
 495 static void ieee80211_authenticate(struct net_device *dev,
 496                                    struct ieee80211_if_sta *ifsta)
 497 {
 498         ifsta->auth_tries++;
 499         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 500                 printk(KERN_DEBUG "%s: authentication with AP " MAC_FMT
 501                        " timed out\n",
 502                        dev->name, MAC_ARG(ifsta->bssid));
 503                 ifsta->state = IEEE80211_DISABLED;
 504                 return;
 505         }
 506
 507         ifsta->state = IEEE80211_AUTHENTICATE;
 508         printk(KERN_DEBUG "%s: authenticate with AP " MAC_FMT "\n",
 509                dev->name, MAC_ARG(ifsta->bssid));
 510
 511         ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);
 512
 513         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 514 }
 515
 516
 517 static void ieee80211_send_assoc(struct net_device *dev,
 518                                  struct ieee80211_if_sta *ifsta)
 519 {
 520         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 521         struct ieee80211_hw_mode *mode;
 522         struct sk_buff *skb;
 523         struct ieee80211_mgmt *mgmt;
 524         u8 *pos, *ies;
 525         int i, len;
 526         u16 capab;
 527         struct ieee80211_sta_bss *bss;
 528         int wmm = 0;
 529
 530         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 531                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 532                             ifsta->ssid_len);
 533         if (!skb) {
 534                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 535                        "frame\n", dev->name);
 536                 return;
 537         }
 538         skb_reserve(skb, local->hw.extra_tx_headroom);
 539
 540         mode = local->oper_hw_mode;
 541         capab = ifsta->capab;
 542         if (mode->mode == MODE_IEEE80211G) {
 543                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME |
 544                         WLAN_CAPABILITY_SHORT_PREAMBLE;
 545         }
 546         bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
 547         if (bss) {
 548                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 549                         capab |= WLAN_CAPABILITY_PRIVACY;
 550                 if (bss->wmm_ie) {
 551                         wmm = 1;
 552                 }
 553                 ieee80211_rx_bss_put(dev, bss);
 554         }
 555
 556         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 557         memset(mgmt, 0, 24);
 558         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 559         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 560         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 561
 562         if (ifsta->prev_bssid_set) {
 563                 skb_put(skb, 10);
 564                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 565                                                    IEEE80211_STYPE_REASSOC_REQ);
 566                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 567                 mgmt->u.reassoc_req.listen_interval = cpu_to_le16(1);
 568                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 569                        ETH_ALEN);
 570         } else {
 571                 skb_put(skb, 4);
 572                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 573                                                    IEEE80211_STYPE_ASSOC_REQ);
 574                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 575                 mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
 576         }
 577
 578         /* SSID */
 579         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 580         *pos++ = WLAN_EID_SSID;
 581         *pos++ = ifsta->ssid_len;
 582         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 583
 584         len = mode->num_rates;
 585         if (len > 8)
 586                 len = 8;
 587         pos = skb_put(skb, len + 2);
 588         *pos++ = WLAN_EID_SUPP_RATES;
 589         *pos++ = len;
 590         for (i = 0; i < len; i++) {
 591                 int rate = mode->rates[i].rate;
 592                 if (mode->mode == MODE_ATHEROS_TURBO)
 593                         rate /= 2;
 594                 *pos++ = (u8) (rate / 5);
 595         }
 596
 597         if (mode->num_rates > len) {
 598                 pos = skb_put(skb, mode->num_rates - len + 2);
 599                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 600                 *pos++ = mode->num_rates - len;
 601                 for (i = len; i < mode->num_rates; i++) {
 602                         int rate = mode->rates[i].rate;
 603                         if (mode->mode == MODE_ATHEROS_TURBO)
 604                                 rate /= 2;
 605                         *pos++ = (u8) (rate / 5);
 606                 }
 607         }
 608
 609         if (ifsta->extra_ie) {
 610                 pos = skb_put(skb, ifsta->extra_ie_len);
 611                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 612         }
 613
 614         if (wmm && ifsta->wmm_enabled) {
 615                 pos = skb_put(skb, 9);
 616                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 617                 *pos++ = 7; /* len */
 618                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 619                 *pos++ = 0x50;
 620                 *pos++ = 0xf2;
 621                 *pos++ = 2; /* WME */
 622                 *pos++ = 0; /* WME info */
 623                 *pos++ = 1; /* WME ver */
 624                 *pos++ = 0;
 625         }
 626
 627         kfree(ifsta->assocreq_ies);
 628         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 629         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_ATOMIC);
 630         if (ifsta->assocreq_ies)
 631                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 632
 633         ieee80211_sta_tx(dev, skb, 0);
 634 }
 635
 636
 637 static void ieee80211_send_deauth(struct net_device *dev,
 638                                   struct ieee80211_if_sta *ifsta, u16 reason)
 639 {
 640         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 641         struct sk_buff *skb;
 642         struct ieee80211_mgmt *mgmt;
 643
 644         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 645         if (!skb) {
 646                 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
 647                        "frame\n", dev->name);
 648                 return;
 649         }
 650         skb_reserve(skb, local->hw.extra_tx_headroom);
 651
 652         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 653         memset(mgmt, 0, 24);
 654         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 655         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 656         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 657         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 658                                            IEEE80211_STYPE_DEAUTH);
 659         skb_put(skb, 2);
 660         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 661
 662         ieee80211_sta_tx(dev, skb, 0);
 663 }
 664
 665
 666 static void ieee80211_send_disassoc(struct net_device *dev,
 667                                     struct ieee80211_if_sta *ifsta, u16 reason)
 668 {
 669         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 670         struct sk_buff *skb;
 671         struct ieee80211_mgmt *mgmt;
 672
 673         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 674         if (!skb) {
 675                 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
 676                        "frame\n", dev->name);
 677                 return;
 678         }
 679         skb_reserve(skb, local->hw.extra_tx_headroom);
 680
 681         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 682         memset(mgmt, 0, 24);
 683         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 684         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 685         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 686         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 687                                            IEEE80211_STYPE_DISASSOC);
 688         skb_put(skb, 2);
 689         mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
 690
 691         ieee80211_sta_tx(dev, skb, 0);
 692 }
 693
 694
 695 static int ieee80211_privacy_mismatch(struct net_device *dev,
 696                                       struct ieee80211_if_sta *ifsta)
 697 {
 698         struct ieee80211_sta_bss *bss;
 699         int res = 0;
 700
 701         if (!ifsta || ifsta->mixed_cell ||
 702             ifsta->key_mgmt != IEEE80211_KEY_MGMT_NONE)
 703                 return 0;
 704
 705         bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
 706         if (!bss)
 707                 return 0;
 708
 709         if (ieee80211_sta_wep_configured(dev) !=
 710             !!(bss->capability & WLAN_CAPABILITY_PRIVACY))
 711                 res = 1;
 712
 713         ieee80211_rx_bss_put(dev, bss);
 714
 715         return res;
 716 }
 717
 718
 719 static void ieee80211_associate(struct net_device *dev,
 720                                 struct ieee80211_if_sta *ifsta)
 721 {
 722         ifsta->assoc_tries++;
 723         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 724                 printk(KERN_DEBUG "%s: association with AP " MAC_FMT
 725                        " timed out\n",
 726                        dev->name, MAC_ARG(ifsta->bssid));
 727                 ifsta->state = IEEE80211_DISABLED;
 728                 return;
 729         }
 730
 731         ifsta->state = IEEE80211_ASSOCIATE;
 732         printk(KERN_DEBUG "%s: associate with AP " MAC_FMT "\n",
 733                dev->name, MAC_ARG(ifsta->bssid));
 734         if (ieee80211_privacy_mismatch(dev, ifsta)) {
 735                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 736                        "mixed-cell disabled - abort association\n", dev->name);
 737                 ifsta->state = IEEE80211_DISABLED;
 738                 return;
 739         }
 740
 741         ieee80211_send_assoc(dev, ifsta);
 742
 743         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 744 }
 745
 746
 747 static void ieee80211_associated(struct net_device *dev,
 748                                  struct ieee80211_if_sta *ifsta)
 749 {
 750         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 751         struct sta_info *sta;
 752         int disassoc;
 753
 754         /* TODO: start monitoring current AP signal quality and number of
 755          * missed beacons. Scan other channels every now and then and search
 756          * for better APs. */
 757         /* TODO: remove expired BSSes */
 758
 759         ifsta->state = IEEE80211_ASSOCIATED;
 760
 761         sta = sta_info_get(local, ifsta->bssid);
 762         if (!sta) {
 763                 printk(KERN_DEBUG "%s: No STA entry for own AP " MAC_FMT "\n",
 764                        dev->name, MAC_ARG(ifsta->bssid));
 765                 disassoc = 1;
 766         } else {
 767                 disassoc = 0;
 768                 if (time_after(jiffies,
 769                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 770                         if (ifsta->probereq_poll) {
 771                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 772                                        "current AP " MAC_FMT " - assume out of "
 773                                        "range\n",
 774                                        dev->name, MAC_ARG(ifsta->bssid));
 775                                 disassoc = 1;
 776                                 sta_info_free(sta, 0);
 777                                 ifsta->probereq_poll = 0;
 778                         } else {
 779                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 780                                                          local->scan_ssid,
 781                                                          local->scan_ssid_len);
 782                                 ifsta->probereq_poll = 1;
 783                         }
 784                 } else {
 785                         ifsta->probereq_poll = 0;
 786                         if (time_after(jiffies, ifsta->last_probe +
 787                                        IEEE80211_PROBE_INTERVAL)) {
 788                                 ifsta->last_probe = jiffies;
 789                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 790                                                          ifsta->ssid,
 791                                                          ifsta->ssid_len);
 792                         }
 793                 }
 794                 sta_info_put(sta);
 795         }
 796         if (disassoc) {
 797                 union iwreq_data wrqu;
 798                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 799                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 800                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 801                 mod_timer(&ifsta->timer, jiffies +
 802                                       IEEE80211_MONITORING_INTERVAL + 30 * HZ);
 803         } else {
 804                 mod_timer(&ifsta->timer, jiffies +
 805                                       IEEE80211_MONITORING_INTERVAL);
 806         }
 807 }
 808
 809
 810 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
 811                                      u8 *ssid, size_t ssid_len)
 812 {
 813         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 814         struct ieee80211_hw_mode *mode;
 815         struct sk_buff *skb;
 816         struct ieee80211_mgmt *mgmt;
 817         u8 *pos, *supp_rates, *esupp_rates = NULL;
 818         int i;
 819
 820         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
 821         if (!skb) {
 822                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 823                        "request\n", dev->name);
 824                 return;
 825         }
 826         skb_reserve(skb, local->hw.extra_tx_headroom);
 827
 828         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 829         memset(mgmt, 0, 24);
 830         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 831                                            IEEE80211_STYPE_PROBE_REQ);
 832         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 833         if (dst) {
 834                 memcpy(mgmt->da, dst, ETH_ALEN);
 835                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 836         } else {
 837                 memset(mgmt->da, 0xff, ETH_ALEN);
 838                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 839         }
 840         pos = skb_put(skb, 2 + ssid_len);
 841         *pos++ = WLAN_EID_SSID;
 842         *pos++ = ssid_len;
 843         memcpy(pos, ssid, ssid_len);
 844
 845         supp_rates = skb_put(skb, 2);
 846         supp_rates[0] = WLAN_EID_SUPP_RATES;
 847         supp_rates[1] = 0;
 848         mode = local->oper_hw_mode;
 849         for (i = 0; i < mode->num_rates; i++) {
 850                 struct ieee80211_rate *rate = &mode->rates[i];
 851                 if (!(rate->flags & IEEE80211_RATE_SUPPORTED))
 852                         continue;
 853                 if (esupp_rates) {
 854                         pos = skb_put(skb, 1);
 855                         esupp_rates[1]++;
 856                 } else if (supp_rates[1] == 8) {
 857                         esupp_rates = skb_put(skb, 3);
 858                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 859                         esupp_rates[1] = 1;
 860                         pos = &esupp_rates[2];
 861                 } else {
 862                         pos = skb_put(skb, 1);
 863                         supp_rates[1]++;
 864                 }
 865                 if (mode->mode == MODE_ATHEROS_TURBO)
 866                         *pos = rate->rate / 10;
 867                 else
 868                         *pos = rate->rate / 5;
 869         }
 870
 871         ieee80211_sta_tx(dev, skb, 0);
 872 }
 873
 874
 875 static int ieee80211_sta_wep_configured(struct net_device *dev)
 876 {
 877         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 878         if (!sdata || !sdata->default_key ||
 879             sdata->default_key->alg != ALG_WEP)
 880                 return 0;
 881         return 1;
 882 }
 883
 884
 885 static void ieee80211_auth_completed(struct net_device *dev,
 886                                      struct ieee80211_if_sta *ifsta)
 887 {
 888         printk(KERN_DEBUG "%s: authenticated\n", dev->name);
 889         ifsta->authenticated = 1;
 890         ieee80211_associate(dev, ifsta);
 891 }
 892
 893
 894 static void ieee80211_auth_challenge(struct net_device *dev,
 895                                      struct ieee80211_if_sta *ifsta,
 896                                      struct ieee80211_mgmt *mgmt,
 897                                      size_t len)
 898 {
 899         u8 *pos;
 900         struct ieee802_11_elems elems;
 901
 902         printk(KERN_DEBUG "%s: replying to auth challenge\n", dev->name);
 903         pos = mgmt->u.auth.variable;
 904         if (ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems)
 905             == ParseFailed) {
 906                 printk(KERN_DEBUG "%s: failed to parse Auth(challenge)\n",
 907                        dev->name);
 908                 return;
 909         }
 910         if (!elems.challenge) {
 911                 printk(KERN_DEBUG "%s: no challenge IE in shared key auth "
 912                        "frame\n", dev->name);
 913                 return;
 914         }
 915         ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
 916                             elems.challenge_len + 2, 1);
 917 }
 918
 919
 920 static void ieee80211_rx_mgmt_auth(struct net_device *dev,
 921                                    struct ieee80211_if_sta *ifsta,
 922                                    struct ieee80211_mgmt *mgmt,
 923                                    size_t len)
 924 {
 925         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 926         u16 auth_alg, auth_transaction, status_code;
 927
 928         if (ifsta->state != IEEE80211_AUTHENTICATE &&
 929             sdata->type != IEEE80211_IF_TYPE_IBSS) {
 930                 printk(KERN_DEBUG "%s: authentication frame received from "
 931                        MAC_FMT ", but not in authenticate state - ignored\n",
 932                        dev->name, MAC_ARG(mgmt->sa));
 933                 return;
 934         }
 935
 936         if (len < 24 + 6) {
 937                 printk(KERN_DEBUG "%s: too short (%zd) authentication frame "
 938                        "received from " MAC_FMT " - ignored\n",
 939                        dev->name, len, MAC_ARG(mgmt->sa));
 940                 return;
 941         }
 942
 943         if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
 944             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
 945                 printk(KERN_DEBUG "%s: authentication frame received from "
 946                        "unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
 947                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
 948                        MAC_ARG(mgmt->bssid));
 949                 return;
 950         }
 951
 952         if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
 953             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) {
 954                 printk(KERN_DEBUG "%s: authentication frame received from "
 955                        "unknown BSSID (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
 956                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
 957                        MAC_ARG(mgmt->bssid));
 958                 return;
 959         }
 960
 961         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 962         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 963         status_code = le16_to_cpu(mgmt->u.auth.status_code);
 964
 965         printk(KERN_DEBUG "%s: RX authentication from " MAC_FMT " (alg=%d "
 966                "transaction=%d status=%d)\n",
 967                dev->name, MAC_ARG(mgmt->sa), auth_alg,
 968                auth_transaction, status_code);
 969
 970         if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
 971                 /* IEEE 802.11 standard does not require authentication in IBSS
 972                  * networks and most implementations do not seem to use it.
 973                  * However, try to reply to authentication attempts if someone
 974                  * has actually implemented this.
 975                  * TODO: Could implement shared key authentication. */
 976                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) {
 977                         printk(KERN_DEBUG "%s: unexpected IBSS authentication "
 978                                "frame (alg=%d transaction=%d)\n",
 979                                dev->name, auth_alg, auth_transaction);
 980                         return;
 981                 }
 982                 ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
 983         }
 984
 985         if (auth_alg != ifsta->auth_alg ||
 986             auth_transaction != ifsta->auth_transaction) {
 987                 printk(KERN_DEBUG "%s: unexpected authentication frame "
 988                        "(alg=%d transaction=%d)\n",
 989                        dev->name, auth_alg, auth_transaction);
 990                 return;
 991         }
 992
 993         if (status_code != WLAN_STATUS_SUCCESS) {
 994                 printk(KERN_DEBUG "%s: AP denied authentication (auth_alg=%d "
 995                        "code=%d)\n", dev->name, ifsta->auth_alg, status_code);
 996                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
 997                         u8 algs[3];
 998                         const int num_algs = ARRAY_SIZE(algs);
 999                         int i, pos;
1000                         algs[0] = algs[1] = algs[2] = 0xff;
1001                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1002                                 algs[0] = WLAN_AUTH_OPEN;
1003                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1004                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1005                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1006                                 algs[2] = WLAN_AUTH_LEAP;
1007                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1008                                 pos = 0;
1009                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1010                                 pos = 1;
1011                         else
1012                                 pos = 2;
1013                         for (i = 0; i < num_algs; i++) {
1014                                 pos++;
1015                                 if (pos >= num_algs)
1016                                         pos = 0;
1017                                 if (algs[pos] == ifsta->auth_alg ||
1018                                     algs[pos] == 0xff)
1019                                         continue;
1020                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1021                                     !ieee80211_sta_wep_configured(dev))
1022                                         continue;
1023                                 ifsta->auth_alg = algs[pos];
1024                                 printk(KERN_DEBUG "%s: set auth_alg=%d for "
1025                                        "next try\n",
1026                                        dev->name, ifsta->auth_alg);
1027                                 break;
1028                         }
1029                 }
1030                 return;
1031         }
1032
1033         switch (ifsta->auth_alg) {
1034         case WLAN_AUTH_OPEN:
1035         case WLAN_AUTH_LEAP:
1036                 ieee80211_auth_completed(dev, ifsta);
1037                 break;
1038         case WLAN_AUTH_SHARED_KEY:
1039                 if (ifsta->auth_transaction == 4)
1040                         ieee80211_auth_completed(dev, ifsta);
1041                 else
1042                         ieee80211_auth_challenge(dev, ifsta, mgmt, len);
1043                 break;
1044         }
1045 }
1046
1047
1048 static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
1049                                      struct ieee80211_if_sta *ifsta,
1050                                      struct ieee80211_mgmt *mgmt,
1051                                      size_t len)
1052 {
1053         u16 reason_code;
1054
1055         if (len < 24 + 2) {
1056                 printk(KERN_DEBUG "%s: too short (%zd) deauthentication frame "
1057                        "received from " MAC_FMT " - ignored\n",
1058                        dev->name, len, MAC_ARG(mgmt->sa));
1059                 return;
1060         }
1061
1062         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1063                 printk(KERN_DEBUG "%s: deauthentication frame received from "
1064                        "unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
1065                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
1066                        MAC_ARG(mgmt->bssid));
1067                 return;
1068         }
1069
1070         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1071
1072         printk(KERN_DEBUG "%s: RX deauthentication from " MAC_FMT
1073                " (reason=%d)\n",
1074                dev->name, MAC_ARG(mgmt->sa), reason_code);
1075
1076         if (ifsta->authenticated) {
1077                 printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
1078         }
1079
1080         if (ifsta->state == IEEE80211_AUTHENTICATE ||
1081             ifsta->state == IEEE80211_ASSOCIATE ||
1082             ifsta->state == IEEE80211_ASSOCIATED) {
1083                 ifsta->state = IEEE80211_AUTHENTICATE;
1084                 mod_timer(&ifsta->timer, jiffies +
1085                                       IEEE80211_RETRY_AUTH_INTERVAL);
1086         }
1087
1088         ieee80211_set_disassoc(dev, ifsta, 1);
1089         ifsta->authenticated = 0;
1090 }
1091
1092
1093 static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
1094                                        struct ieee80211_if_sta *ifsta,
1095                                        struct ieee80211_mgmt *mgmt,
1096                                        size_t len)
1097 {
1098         u16 reason_code;
1099
1100         if (len < 24 + 2) {
1101                 printk(KERN_DEBUG "%s: too short (%zd) disassociation frame "
1102                        "received from " MAC_FMT " - ignored\n",
1103                        dev->name, len, MAC_ARG(mgmt->sa));
1104                 return;
1105         }
1106
1107         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1108                 printk(KERN_DEBUG "%s: disassociation frame received from "
1109                        "unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
1110                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
1111                        MAC_ARG(mgmt->bssid));
1112                 return;
1113         }
1114
1115         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1116
1117         printk(KERN_DEBUG "%s: RX disassociation from " MAC_FMT
1118                " (reason=%d)\n",
1119                dev->name, MAC_ARG(mgmt->sa), reason_code);
1120
1121         if (ifsta->associated)
1122                 printk(KERN_DEBUG "%s: disassociated\n", dev->name);
1123
1124         if (ifsta->state == IEEE80211_ASSOCIATED) {
1125                 ifsta->state = IEEE80211_ASSOCIATE;
1126                 mod_timer(&ifsta->timer, jiffies +
1127                                       IEEE80211_RETRY_AUTH_INTERVAL);
1128         }
1129
1130         ieee80211_set_disassoc(dev, ifsta, 0);
1131 }
1132
1133
1134 static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
1135                                          struct ieee80211_if_sta *ifsta,
1136                                          struct ieee80211_mgmt *mgmt,
1137                                          size_t len,
1138                                          int reassoc)
1139 {
1140         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1141         struct ieee80211_hw_mode *mode;
1142         struct sta_info *sta;
1143         u32 rates;
1144         u16 capab_info, status_code, aid;
1145         struct ieee802_11_elems elems;
1146         u8 *pos;
1147         int i, j;
1148
1149         /* AssocResp and ReassocResp have identical structure, so process both
1150          * of them in this function. */
1151
1152         if (ifsta->state != IEEE80211_ASSOCIATE) {
1153                 printk(KERN_DEBUG "%s: association frame received from "
1154                        MAC_FMT ", but not in associate state - ignored\n",
1155                        dev->name, MAC_ARG(mgmt->sa));
1156                 return;
1157         }
1158
1159         if (len < 24 + 6) {
1160                 printk(KERN_DEBUG "%s: too short (%zd) association frame "
1161                        "received from " MAC_FMT " - ignored\n",
1162                        dev->name, len, MAC_ARG(mgmt->sa));
1163                 return;
1164         }
1165
1166         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1167                 printk(KERN_DEBUG "%s: association frame received from "
1168                        "unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
1169                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
1170                        MAC_ARG(mgmt->bssid));
1171                 return;
1172         }
1173
1174         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1175         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1176         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1177         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1178                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1179                        "set\n", dev->name, aid);
1180         aid &= ~(BIT(15) | BIT(14));
1181
1182         printk(KERN_DEBUG "%s: RX %sssocResp from " MAC_FMT " (capab=0x%x "
1183                "status=%d aid=%d)\n",
1184                dev->name, reassoc ? "Rea" : "A", MAC_ARG(mgmt->sa),
1185                capab_info, status_code, aid);
1186
1187         if (status_code != WLAN_STATUS_SUCCESS) {
1188                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1189                        dev->name, status_code);
1190                 if (status_code == WLAN_STATUS_REASSOC_NO_ASSOC)
1191                         ifsta->prev_bssid_set = 0;
1192                 return;
1193         }
1194
1195         pos = mgmt->u.assoc_resp.variable;
1196         if (ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems)
1197             == ParseFailed) {
1198                 printk(KERN_DEBUG "%s: failed to parse AssocResp\n",
1199                        dev->name);
1200                 return;
1201         }
1202
1203         if (!elems.supp_rates) {
1204                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1205                        dev->name);
1206                 return;
1207         }
1208
1209         /* it probably doesn't, but if the frame includes an ERP value then
1210          * update our stored copy */
1211         if (elems.erp_info && elems.erp_info_len >= 1) {
1212                 struct ieee80211_sta_bss *bss
1213                         = ieee80211_rx_bss_get(dev, ifsta->bssid);
1214                 if (bss) {
1215                         bss->erp_value = elems.erp_info[0];
1216                         bss->has_erp_value = 1;
1217                         ieee80211_rx_bss_put(dev, bss);
1218                 }
1219         }
1220
1221         printk(KERN_DEBUG "%s: associated\n", dev->name);
1222         ifsta->aid = aid;
1223         ifsta->ap_capab = capab_info;
1224
1225         kfree(ifsta->assocresp_ies);
1226         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1227         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_ATOMIC);
1228         if (ifsta->assocresp_ies)
1229                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1230
1231         ieee80211_set_associated(dev, ifsta, 1);
1232
1233         /* Add STA entry for the AP */
1234         sta = sta_info_get(local, ifsta->bssid);
1235         if (!sta) {
1236                 struct ieee80211_sta_bss *bss;
1237                 sta = sta_info_add(local, dev, ifsta->bssid, GFP_ATOMIC);
1238                 if (!sta) {
1239                         printk(KERN_DEBUG "%s: failed to add STA entry for the"
1240                                " AP\n", dev->name);
1241                         return;
1242                 }
1243                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
1244                 if (bss) {
1245                         sta->last_rssi = bss->rssi;
1246                         sta->last_signal = bss->signal;
1247                         sta->last_noise = bss->noise;
1248                         ieee80211_rx_bss_put(dev, bss);
1249                 }
1250         }
1251
1252         sta->dev = dev;
1253         sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC;
1254         sta->assoc_ap = 1;
1255
1256         rates = 0;
1257         mode = local->oper_hw_mode;
1258         for (i = 0; i < elems.supp_rates_len; i++) {
1259                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1260                 if (mode->mode == MODE_ATHEROS_TURBO)
1261                         rate *= 2;
1262                 for (j = 0; j < mode->num_rates; j++)
1263                         if (mode->rates[j].rate == rate)
1264                                 rates |= BIT(j);
1265         }
1266         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1267                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1268                 if (mode->mode == MODE_ATHEROS_TURBO)
1269                         rate *= 2;
1270                 for (j = 0; j < mode->num_rates; j++)
1271                         if (mode->rates[j].rate == rate)
1272                                 rates |= BIT(j);
1273         }
1274         sta->supp_rates = rates;
1275
1276         rate_control_rate_init(sta, local);
1277
1278         if (elems.wmm_param && ifsta->wmm_enabled) {
1279                 sta->flags |= WLAN_STA_WME;
1280                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1281                                          elems.wmm_param_len);
1282         }
1283
1284
1285         sta_info_put(sta);
1286
1287         ieee80211_associated(dev, ifsta);
1288 }
1289
1290
1291 /* Caller must hold local->sta_bss_lock */
1292 static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
1293                                         struct ieee80211_sta_bss *bss)
1294 {
1295         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1296         bss->hnext = local->sta_bss_hash[STA_HASH(bss->bssid)];
1297         local->sta_bss_hash[STA_HASH(bss->bssid)] = bss;
1298 }
1299
1300
1301 /* Caller must hold local->sta_bss_lock */
1302 static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
1303                                         struct ieee80211_sta_bss *bss)
1304 {
1305         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1306         struct ieee80211_sta_bss *b, *prev = NULL;
1307         b = local->sta_bss_hash[STA_HASH(bss->bssid)];
1308         while (b) {
1309                 if (b == bss) {
1310                         if (!prev)
1311                                 local->sta_bss_hash[STA_HASH(bss->bssid)] =
1312                                         bss->hnext;
1313                         else
1314                                 prev->hnext = bss->hnext;
1315                         break;
1316                 }
1317                 prev = b;
1318                 b = b->hnext;
1319         }
1320 }
1321
1322
1323 static struct ieee80211_sta_bss *
1324 ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid)
1325 {
1326         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1327         struct ieee80211_sta_bss *bss;
1328
1329         bss = kmalloc(sizeof(*bss), GFP_ATOMIC);
1330         if (!bss)
1331                 return NULL;
1332         memset(bss, 0, sizeof(*bss));
1333         atomic_inc(&bss->users);
1334         atomic_inc(&bss->users);
1335         memcpy(bss->bssid, bssid, ETH_ALEN);
1336
1337         spin_lock_bh(&local->sta_bss_lock);
1338         /* TODO: order by RSSI? */
1339         list_add_tail(&bss->list, &local->sta_bss_list);
1340         __ieee80211_rx_bss_hash_add(dev, bss);
1341         spin_unlock_bh(&local->sta_bss_lock);
1342         return bss;
1343 }
1344
1345
1346 static struct ieee80211_sta_bss *
1347 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid)
1348 {
1349         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1350         struct ieee80211_sta_bss *bss;
1351
1352         spin_lock_bh(&local->sta_bss_lock);
1353         bss = local->sta_bss_hash[STA_HASH(bssid)];
1354         while (bss) {
1355                 if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0) {
1356                         atomic_inc(&bss->users);
1357                         break;
1358                 }
1359                 bss = bss->hnext;
1360         }
1361         spin_unlock_bh(&local->sta_bss_lock);
1362         return bss;
1363 }
1364
1365
1366 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
1367 {
1368         kfree(bss->wpa_ie);
1369         kfree(bss->rsn_ie);
1370         kfree(bss->wmm_ie);
1371         kfree(bss);
1372 }
1373
1374
1375 static void ieee80211_rx_bss_put(struct net_device *dev,
1376                                  struct ieee80211_sta_bss *bss)
1377 {
1378         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1379         if (!atomic_dec_and_test(&bss->users))
1380                 return;
1381
1382         spin_lock_bh(&local->sta_bss_lock);
1383         __ieee80211_rx_bss_hash_del(dev, bss);
1384         list_del(&bss->list);
1385         spin_unlock_bh(&local->sta_bss_lock);
1386         ieee80211_rx_bss_free(bss);
1387 }
1388
1389
1390 void ieee80211_rx_bss_list_init(struct net_device *dev)
1391 {
1392         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1393         spin_lock_init(&local->sta_bss_lock);
1394         INIT_LIST_HEAD(&local->sta_bss_list);
1395 }
1396
1397
1398 void ieee80211_rx_bss_list_deinit(struct net_device *dev)
1399 {
1400         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1401         struct ieee80211_sta_bss *bss, *tmp;
1402
1403         list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
1404                 ieee80211_rx_bss_put(dev, bss);
1405 }
1406
1407
1408 static void ieee80211_rx_bss_info(struct net_device *dev,
1409                                   struct ieee80211_mgmt *mgmt,
1410                                   size_t len,
1411                                   struct ieee80211_rx_status *rx_status,
1412                                   int beacon)
1413 {
1414         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1415         struct ieee802_11_elems elems;
1416         size_t baselen;
1417         int channel, invalid = 0, clen;
1418         struct ieee80211_sta_bss *bss;
1419         struct sta_info *sta;
1420         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1421         u64 timestamp;
1422
1423         if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
1424                 return; /* ignore ProbeResp to foreign address */
1425
1426 #if 0
1427         printk(KERN_DEBUG "%s: RX %s from " MAC_FMT " to " MAC_FMT "\n",
1428                dev->name, beacon ? "Beacon" : "Probe Response",
1429                MAC_ARG(mgmt->sa), MAC_ARG(mgmt->da));
1430 #endif
1431
1432         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1433         if (baselen > len)
1434                 return;
1435
1436         timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1437
1438         if (sdata->type == IEEE80211_IF_TYPE_IBSS && beacon &&
1439             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1440 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1441                 static unsigned long last_tsf_debug = 0;
1442                 u64 tsf;
1443                 if (local->ops->get_tsf)
1444                         tsf = local->ops->get_tsf(local_to_hw(local));
1445                 else
1446                         tsf = -1LLU;
1447                 if (time_after(jiffies, last_tsf_debug + 5 * HZ)) {
1448                         printk(KERN_DEBUG "RX beacon SA=" MAC_FMT " BSSID="
1449                                MAC_FMT " TSF=0x%llx BCN=0x%llx diff=%lld "
1450                                "@%lu\n",
1451                                MAC_ARG(mgmt->sa), MAC_ARG(mgmt->bssid),
1452                                (unsigned long long)tsf,
1453                                (unsigned long long)timestamp,
1454                                (unsigned long long)(tsf - timestamp),
1455                                jiffies);
1456                         last_tsf_debug = jiffies;
1457                 }
1458 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1459         }
1460
1461         if (ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen,
1462                                    &elems) == ParseFailed)
1463                 invalid = 1;
1464
1465         if (sdata->type == IEEE80211_IF_TYPE_IBSS && elems.supp_rates &&
1466             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
1467             (sta = sta_info_get(local, mgmt->sa))) {
1468                 struct ieee80211_hw_mode *mode;
1469                 struct ieee80211_rate *rates;
1470                 size_t num_rates;
1471                 u32 supp_rates, prev_rates;
1472                 int i, j;
1473
1474                 mode = local->sta_scanning ?
1475                        local->scan_hw_mode : local->oper_hw_mode;
1476                 rates = mode->rates;
1477                 num_rates = mode->num_rates;
1478
1479                 supp_rates = 0;
1480                 for (i = 0; i < elems.supp_rates_len +
1481                              elems.ext_supp_rates_len; i++) {
1482                         u8 rate = 0;
1483                         int own_rate;
1484                         if (i < elems.supp_rates_len)
1485                                 rate = elems.supp_rates[i];
1486                         else if (elems.ext_supp_rates)
1487                                 rate = elems.ext_supp_rates
1488                                         [i - elems.supp_rates_len];
1489                         own_rate = 5 * (rate & 0x7f);
1490                         if (mode->mode == MODE_ATHEROS_TURBO)
1491                                 own_rate *= 2;
1492                         for (j = 0; j < num_rates; j++)
1493                                 if (rates[j].rate == own_rate)
1494                                         supp_rates |= BIT(j);
1495                 }
1496
1497                 prev_rates = sta->supp_rates;
1498                 sta->supp_rates &= supp_rates;
1499                 if (sta->supp_rates == 0) {
1500                         /* No matching rates - this should not really happen.
1501                          * Make sure that at least one rate is marked
1502                          * supported to avoid issues with TX rate ctrl. */
1503                         sta->supp_rates = sdata->u.sta.supp_rates_bits;
1504                 }
1505                 if (sta->supp_rates != prev_rates) {
1506                         printk(KERN_DEBUG "%s: updated supp_rates set for "
1507                                MAC_FMT " based on beacon info (0x%x & 0x%x -> "
1508                                "0x%x)\n",
1509                                dev->name, MAC_ARG(sta->addr), prev_rates,
1510                                supp_rates, sta->supp_rates);
1511                 }
1512                 sta_info_put(sta);
1513         }
1514
1515         if (!elems.ssid)
1516                 return;
1517
1518         if (elems.ds_params && elems.ds_params_len == 1)
1519                 channel = elems.ds_params[0];
1520         else
1521                 channel = rx_status->channel;
1522
1523         bss = ieee80211_rx_bss_get(dev, mgmt->bssid);
1524         if (!bss) {
1525                 bss = ieee80211_rx_bss_add(dev, mgmt->bssid);
1526                 if (!bss)
1527                         return;
1528         } else {
1529 #if 0
1530                 /* TODO: order by RSSI? */
1531                 spin_lock_bh(&local->sta_bss_lock);
1532                 list_move_tail(&bss->list, &local->sta_bss_list);
1533                 spin_unlock_bh(&local->sta_bss_lock);
1534 #endif
1535         }
1536
1537         if (bss->probe_resp && beacon) {
1538                 /* Do not allow beacon to override data from Probe Response. */
1539                 ieee80211_rx_bss_put(dev, bss);
1540                 return;
1541         }
1542
1543         /* save the ERP value so that it is available at association time */
1544         if (elems.erp_info && elems.erp_info_len >= 1) {
1545                 bss->erp_value = elems.erp_info[0];
1546                 bss->has_erp_value = 1;
1547         }
1548
1549         bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
1550         bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
1551         if (elems.ssid && elems.ssid_len <= IEEE80211_MAX_SSID_LEN) {
1552                 memcpy(bss->ssid, elems.ssid, elems.ssid_len);
1553                 bss->ssid_len = elems.ssid_len;
1554         }
1555
1556         bss->supp_rates_len = 0;
1557         if (elems.supp_rates) {
1558                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1559                 if (clen > elems.supp_rates_len)
1560                         clen = elems.supp_rates_len;
1561                 memcpy(&bss->supp_rates[bss->supp_rates_len], elems.supp_rates,
1562                        clen);
1563                 bss->supp_rates_len += clen;
1564         }
1565         if (elems.ext_supp_rates) {
1566                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1567                 if (clen > elems.ext_supp_rates_len)
1568                         clen = elems.ext_supp_rates_len;
1569                 memcpy(&bss->supp_rates[bss->supp_rates_len],
1570                        elems.ext_supp_rates, clen);
1571                 bss->supp_rates_len += clen;
1572         }
1573
1574         if (elems.wpa &&
1575             (!bss->wpa_ie || bss->wpa_ie_len != elems.wpa_len ||
1576              memcmp(bss->wpa_ie, elems.wpa, elems.wpa_len))) {
1577                 kfree(bss->wpa_ie);
1578                 bss->wpa_ie = kmalloc(elems.wpa_len + 2, GFP_ATOMIC);
1579                 if (bss->wpa_ie) {
1580                         memcpy(bss->wpa_ie, elems.wpa - 2, elems.wpa_len + 2);
1581                         bss->wpa_ie_len = elems.wpa_len + 2;
1582                 } else
1583                         bss->wpa_ie_len = 0;
1584         } else if (!elems.wpa && bss->wpa_ie) {
1585                 kfree(bss->wpa_ie);
1586                 bss->wpa_ie = NULL;
1587                 bss->wpa_ie_len = 0;
1588         }
1589
1590         if (elems.rsn &&
1591             (!bss->rsn_ie || bss->rsn_ie_len != elems.rsn_len ||
1592              memcmp(bss->rsn_ie, elems.rsn, elems.rsn_len))) {
1593                 kfree(bss->rsn_ie);
1594                 bss->rsn_ie = kmalloc(elems.rsn_len + 2, GFP_ATOMIC);
1595                 if (bss->rsn_ie) {
1596                         memcpy(bss->rsn_ie, elems.rsn - 2, elems.rsn_len + 2);
1597                         bss->rsn_ie_len = elems.rsn_len + 2;
1598                 } else
1599                         bss->rsn_ie_len = 0;
1600         } else if (!elems.rsn && bss->rsn_ie) {
1601                 kfree(bss->rsn_ie);
1602                 bss->rsn_ie = NULL;
1603                 bss->rsn_ie_len = 0;
1604         }
1605
1606         if (elems.wmm_param &&
1607             (!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_param_len ||
1608              memcmp(bss->wmm_ie, elems.wmm_param, elems.wmm_param_len))) {
1609                 kfree(bss->wmm_ie);
1610                 bss->wmm_ie = kmalloc(elems.wmm_param_len + 2, GFP_ATOMIC);
1611                 if (bss->wmm_ie) {
1612                         memcpy(bss->wmm_ie, elems.wmm_param - 2,
1613                                elems.wmm_param_len + 2);
1614                         bss->wmm_ie_len = elems.wmm_param_len + 2;
1615                 } else
1616                         bss->wmm_ie_len = 0;
1617         } else if (!elems.wmm_param && bss->wmm_ie) {
1618                 kfree(bss->wmm_ie);
1619                 bss->wmm_ie = NULL;
1620                 bss->wmm_ie_len = 0;
1621         }
1622
1623
1624         bss->hw_mode = rx_status->phymode;
1625         bss->channel = channel;
1626         bss->freq = rx_status->freq;
1627         if (channel != rx_status->channel &&
1628             (bss->hw_mode == MODE_IEEE80211G ||
1629              bss->hw_mode == MODE_IEEE80211B) &&
1630             channel >= 1 && channel <= 14) {
1631                 static const int freq_list[] = {
1632                         2412, 2417, 2422, 2427, 2432, 2437, 2442,
1633                         2447, 2452, 2457, 2462, 2467, 2472, 2484
1634                 };
1635                 /* IEEE 802.11g/b mode can receive packets from neighboring
1636                  * channels, so map the channel into frequency. */
1637                 bss->freq = freq_list[channel - 1];
1638         }
1639         bss->timestamp = timestamp;
1640         bss->last_update = jiffies;
1641         bss->rssi = rx_status->ssi;
1642         bss->signal = rx_status->signal;
1643         bss->noise = rx_status->noise;
1644         if (!beacon)
1645                 bss->probe_resp++;
1646         ieee80211_rx_bss_put(dev, bss);
1647 }
1648
1649
1650 static void ieee80211_rx_mgmt_probe_resp(struct net_device *dev,
1651                                          struct ieee80211_mgmt *mgmt,
1652                                          size_t len,
1653                                          struct ieee80211_rx_status *rx_status)
1654 {
1655         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 0);
1656 }
1657
1658
1659 static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
1660                                      struct ieee80211_mgmt *mgmt,
1661                                      size_t len,
1662                                      struct ieee80211_rx_status *rx_status)
1663 {
1664         struct ieee80211_sub_if_data *sdata;
1665         struct ieee80211_if_sta *ifsta;
1666         size_t baselen;
1667         struct ieee802_11_elems elems;
1668
1669         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 1);
1670
1671         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1672         if (sdata->type != IEEE80211_IF_TYPE_STA)
1673                 return;
1674         ifsta = &sdata->u.sta;
1675
1676         if (!ifsta->associated ||
1677             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1678                 return;
1679
1680         /* Process beacon from the current BSS */
1681         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1682         if (baselen > len)
1683                 return;
1684
1685         if (ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen,
1686                                    &elems) == ParseFailed)
1687                 return;
1688
1689         if (elems.erp_info && elems.erp_info_len >= 1)
1690                 ieee80211_handle_erp_ie(dev, elems.erp_info[0]);
1691
1692         if (elems.wmm_param && ifsta->wmm_enabled) {
1693                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1694                                          elems.wmm_param_len);
1695         }
1696 }
1697
1698
1699 static void ieee80211_rx_mgmt_probe_req(struct net_device *dev,
1700                                         struct ieee80211_if_sta *ifsta,
1701                                         struct ieee80211_mgmt *mgmt,
1702                                         size_t len,
1703                                         struct ieee80211_rx_status *rx_status)
1704 {
1705         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1706         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1707         int tx_last_beacon;
1708         struct sk_buff *skb;
1709         struct ieee80211_mgmt *resp;
1710         u8 *pos, *end;
1711
1712         if (sdata->type != IEEE80211_IF_TYPE_IBSS ||
1713             ifsta->state != IEEE80211_IBSS_JOINED ||
1714             len < 24 + 2 || !ifsta->probe_resp)
1715                 return;
1716
1717         if (local->ops->tx_last_beacon)
1718                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1719         else
1720                 tx_last_beacon = 1;
1721
1722 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1723         printk(KERN_DEBUG "%s: RX ProbeReq SA=" MAC_FMT " DA=" MAC_FMT " BSSID="
1724                MAC_FMT " (tx_last_beacon=%d)\n",
1725                dev->name, MAC_ARG(mgmt->sa), MAC_ARG(mgmt->da),
1726                MAC_ARG(mgmt->bssid), tx_last_beacon);
1727 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1728
1729         if (!tx_last_beacon)
1730                 return;
1731
1732         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1733             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1734                 return;
1735
1736         end = ((u8 *) mgmt) + len;
1737         pos = mgmt->u.probe_req.variable;
1738         if (pos[0] != WLAN_EID_SSID ||
1739             pos + 2 + pos[1] > end) {
1740                 if (net_ratelimit()) {
1741                         printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1742                                "from " MAC_FMT "\n",
1743                                dev->name, MAC_ARG(mgmt->sa));
1744                 }
1745                 return;
1746         }
1747         if (pos[1] != 0 &&
1748             (pos[1] != ifsta->ssid_len ||
1749              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1750                 /* Ignore ProbeReq for foreign SSID */
1751                 return;
1752         }
1753
1754         /* Reply with ProbeResp */
1755         skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC);
1756         if (!skb)
1757                 return;
1758
1759         resp = (struct ieee80211_mgmt *) skb->data;
1760         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1761 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1762         printk(KERN_DEBUG "%s: Sending ProbeResp to " MAC_FMT "\n",
1763                dev->name, MAC_ARG(resp->da));
1764 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1765         ieee80211_sta_tx(dev, skb, 0);
1766 }
1767
1768
1769 void ieee80211_sta_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
1770                            struct ieee80211_rx_status *rx_status)
1771 {
1772         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1773         struct ieee80211_sub_if_data *sdata;
1774         struct ieee80211_if_sta *ifsta;
1775         struct ieee80211_mgmt *mgmt;
1776         u16 fc;
1777
1778         if (skb->len < 24)
1779                 goto fail;
1780
1781         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1782         ifsta = &sdata->u.sta;
1783
1784         mgmt = (struct ieee80211_mgmt *) skb->data;
1785         fc = le16_to_cpu(mgmt->frame_control);
1786
1787         switch (fc & IEEE80211_FCTL_STYPE) {
1788         case IEEE80211_STYPE_PROBE_REQ:
1789         case IEEE80211_STYPE_PROBE_RESP:
1790         case IEEE80211_STYPE_BEACON:
1791                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1792         case IEEE80211_STYPE_AUTH:
1793         case IEEE80211_STYPE_ASSOC_RESP:
1794         case IEEE80211_STYPE_REASSOC_RESP:
1795         case IEEE80211_STYPE_DEAUTH:
1796         case IEEE80211_STYPE_DISASSOC:
1797                 skb_queue_tail(&ifsta->skb_queue, skb);
1798                 queue_work(local->hw.workqueue, &ifsta->work);
1799                 return;
1800         default:
1801                 printk(KERN_DEBUG "%s: received unknown management frame - "
1802                        "stype=%d\n", dev->name,
1803                        (fc & IEEE80211_FCTL_STYPE) >> 4);
1804                 break;
1805         }
1806
1807  fail:
1808         kfree_skb(skb);
1809 }
1810
1811
1812 static void ieee80211_sta_rx_queued_mgmt(struct net_device *dev,
1813                                          struct sk_buff *skb)
1814 {
1815         struct ieee80211_rx_status *rx_status;
1816         struct ieee80211_sub_if_data *sdata;
1817         struct ieee80211_if_sta *ifsta;
1818         struct ieee80211_mgmt *mgmt;
1819         u16 fc;
1820
1821         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1822         ifsta = &sdata->u.sta;
1823
1824         rx_status = (struct ieee80211_rx_status *) skb->cb;
1825         mgmt = (struct ieee80211_mgmt *) skb->data;
1826         fc = le16_to_cpu(mgmt->frame_control);
1827
1828         switch (fc & IEEE80211_FCTL_STYPE) {
1829         case IEEE80211_STYPE_PROBE_REQ:
1830                 ieee80211_rx_mgmt_probe_req(dev, ifsta, mgmt, skb->len,
1831                                             rx_status);
1832                 break;
1833         case IEEE80211_STYPE_PROBE_RESP:
1834                 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
1835                 break;
1836         case IEEE80211_STYPE_BEACON:
1837                 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
1838                 break;
1839         case IEEE80211_STYPE_AUTH:
1840                 ieee80211_rx_mgmt_auth(dev, ifsta, mgmt, skb->len);
1841                 break;
1842         case IEEE80211_STYPE_ASSOC_RESP:
1843                 ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len, 0);
1844                 break;
1845         case IEEE80211_STYPE_REASSOC_RESP:
1846                 ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len, 1);
1847                 break;
1848         case IEEE80211_STYPE_DEAUTH:
1849                 ieee80211_rx_mgmt_deauth(dev, ifsta, mgmt, skb->len);
1850                 break;
1851         case IEEE80211_STYPE_DISASSOC:
1852                 ieee80211_rx_mgmt_disassoc(dev, ifsta, mgmt, skb->len);
1853                 break;
1854         }
1855
1856         kfree_skb(skb);
1857 }
1858
1859
1860 void ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
1861                            struct ieee80211_rx_status *rx_status)
1862 {
1863         struct ieee80211_mgmt *mgmt;
1864         u16 fc;
1865
1866         if (skb->len < 24) {
1867                 dev_kfree_skb(skb);
1868                 return;
1869         }
1870
1871         mgmt = (struct ieee80211_mgmt *) skb->data;
1872         fc = le16_to_cpu(mgmt->frame_control);
1873
1874         if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) {
1875                 if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP) {
1876                         ieee80211_rx_mgmt_probe_resp(dev, mgmt,
1877                                                      skb->len, rx_status);
1878                 } else if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
1879                         ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len,
1880                                                  rx_status);
1881                 }
1882         }
1883
1884         dev_kfree_skb(skb);
1885 }
1886
1887
1888 static int ieee80211_sta_active_ibss(struct net_device *dev)
1889 {
1890         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1891         int active = 0;
1892         struct sta_info *sta;
1893
1894         spin_lock_bh(&local->sta_lock);
1895         list_for_each_entry(sta, &local->sta_list, list) {
1896                 if (sta->dev == dev &&
1897                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1898                                jiffies)) {
1899                         active++;
1900                         break;
1901                 }
1902         }
1903         spin_unlock_bh(&local->sta_lock);
1904
1905         return active;
1906 }
1907
1908
1909 static void ieee80211_sta_expire(struct net_device *dev)
1910 {
1911         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1912         struct sta_info *sta, *tmp;
1913
1914         spin_lock_bh(&local->sta_lock);
1915         list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
1916                 if (time_after(jiffies, sta->last_rx +
1917                                IEEE80211_IBSS_INACTIVITY_LIMIT)) {
1918                         printk(KERN_DEBUG "%s: expiring inactive STA " MAC_FMT
1919                                "\n", dev->name, MAC_ARG(sta->addr));
1920                         sta_info_free(sta, 1);
1921                 }
1922         spin_unlock_bh(&local->sta_lock);
1923 }
1924
1925
1926 static void ieee80211_sta_merge_ibss(struct net_device *dev,
1927                                      struct ieee80211_if_sta *ifsta)
1928 {
1929         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1930
1931         ieee80211_sta_expire(dev);
1932         if (ieee80211_sta_active_ibss(dev))
1933                 return;
1934
1935         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1936                "IBSS networks with same SSID (merge)\n", dev->name);
1937         ieee80211_sta_req_scan(dev, ifsta->ssid, ifsta->ssid_len);
1938 }
1939
1940
1941 void ieee80211_sta_timer(unsigned long data)
1942 {
1943         struct ieee80211_sub_if_data *sdata =
1944                 (struct ieee80211_sub_if_data *) data;
1945         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1946         struct ieee80211_local *local = wdev_priv(&sdata->wdev);
1947
1948         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1949         queue_work(local->hw.workqueue, &ifsta->work);
1950 }
1951
1952
1953 void ieee80211_sta_work(struct work_struct *work)
1954 {
1955         struct ieee80211_sub_if_data *sdata =
1956                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
1957         struct net_device *dev = sdata->dev;
1958         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1959         struct ieee80211_if_sta *ifsta;
1960         struct sk_buff *skb;
1961
1962         if (!netif_running(dev))
1963                 return;
1964
1965         if (local->sta_scanning)
1966                 return;
1967
1968         if (sdata->type != IEEE80211_IF_TYPE_STA &&
1969             sdata->type != IEEE80211_IF_TYPE_IBSS) {
1970                 printk(KERN_DEBUG "%s: ieee80211_sta_work: non-STA interface "
1971                        "(type=%d)\n", dev->name, sdata->type);
1972                 return;
1973         }
1974         ifsta = &sdata->u.sta;
1975
1976         while ((skb = skb_dequeue(&ifsta->skb_queue)))
1977                 ieee80211_sta_rx_queued_mgmt(dev, skb);
1978
1979         if (ifsta->state != IEEE80211_AUTHENTICATE &&
1980             ifsta->state != IEEE80211_ASSOCIATE &&
1981             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
1982                 ieee80211_sta_start_scan(dev, NULL, 0);
1983                 return;
1984         }
1985
1986         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
1987                 if (ieee80211_sta_config_auth(dev, ifsta))
1988                         return;
1989                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1990         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
1991                 return;
1992
1993         switch (ifsta->state) {
1994         case IEEE80211_DISABLED:
1995                 break;
1996         case IEEE80211_AUTHENTICATE:
1997                 ieee80211_authenticate(dev, ifsta);
1998                 break;
1999         case IEEE80211_ASSOCIATE:
2000                 ieee80211_associate(dev, ifsta);
2001                 break;
2002         case IEEE80211_ASSOCIATED:
2003                 ieee80211_associated(dev, ifsta);
2004                 break;
2005         case IEEE80211_IBSS_SEARCH:
2006                 ieee80211_sta_find_ibss(dev, ifsta);
2007                 break;
2008         case IEEE80211_IBSS_JOINED:
2009                 ieee80211_sta_merge_ibss(dev, ifsta);
2010                 break;
2011         default:
2012                 printk(KERN_DEBUG "ieee80211_sta_work: Unknown state %d\n",
2013                        ifsta->state);
2014                 break;
2015         }
2016
2017         if (ieee80211_privacy_mismatch(dev, ifsta)) {
2018                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2019                        "mixed-cell disabled - disassociate\n", dev->name);
2020
2021                 ieee80211_send_disassoc(dev, ifsta, WLAN_REASON_UNSPECIFIED);
2022                 ieee80211_set_disassoc(dev, ifsta, 0);
2023         }
2024 }
2025
2026
2027 static void ieee80211_sta_reset_auth(struct net_device *dev,
2028                                      struct ieee80211_if_sta *ifsta)
2029 {
2030         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2031
2032         if (local->ops->reset_tsf) {
2033                 /* Reset own TSF to allow time synchronization work. */
2034                 local->ops->reset_tsf(local_to_hw(local));
2035         }
2036
2037         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2038
2039
2040         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2041                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2042         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2043                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2044         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2045                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2046         else
2047                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2048         printk(KERN_DEBUG "%s: Initial auth_alg=%d\n", dev->name,
2049                ifsta->auth_alg);
2050         ifsta->auth_transaction = -1;
2051         ifsta->associated = ifsta->auth_tries = ifsta->assoc_tries = 0;
2052         netif_carrier_off(dev);
2053 }
2054
2055
2056 void ieee80211_sta_req_auth(struct net_device *dev,
2057                             struct ieee80211_if_sta *ifsta)
2058 {
2059         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2060         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2061
2062         if (sdata->type != IEEE80211_IF_TYPE_STA)
2063                 return;
2064
2065         if ((ifsta->bssid_set || ifsta->auto_bssid_sel) &&
2066             (ifsta->ssid_set || ifsta->auto_ssid_sel)) {
2067                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2068                 queue_work(local->hw.workqueue, &ifsta->work);
2069         }
2070 }
2071
2072 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2073                                     const char *ssid, int ssid_len)
2074 {
2075         int tmp, hidden_ssid;
2076
2077         if (!memcmp(ifsta->ssid, ssid, ssid_len))
2078                 return 1;
2079
2080         if (ifsta->auto_bssid_sel)
2081                 return 0;
2082
2083         hidden_ssid = 1;
2084         tmp = ssid_len;
2085         while (tmp--) {
2086                 if (ssid[tmp] != '\0') {
2087                         hidden_ssid = 0;
2088                         break;
2089                 }
2090         }
2091
2092         if (hidden_ssid && ifsta->ssid_len == ssid_len)
2093                 return 1;
2094
2095         if (ssid_len == 1 && ssid[0] == ' ')
2096                 return 1;
2097
2098         return 0;
2099 }
2100
2101 static int ieee80211_sta_config_auth(struct net_device *dev,
2102                                      struct ieee80211_if_sta *ifsta)
2103 {
2104         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2105         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2106         struct ieee80211_sta_bss *bss, *selected = NULL;
2107         int top_rssi = 0, freq;
2108
2109         if (!ifsta->auto_channel_sel && !ifsta->auto_bssid_sel &&
2110             !ifsta->auto_ssid_sel) {
2111                 ifsta->state = IEEE80211_AUTHENTICATE;
2112                 ieee80211_sta_reset_auth(dev, ifsta);
2113                 return 0;
2114         }
2115
2116         spin_lock_bh(&local->sta_bss_lock);
2117         freq = local->oper_channel->freq;
2118         list_for_each_entry(bss, &local->sta_bss_list, list) {
2119                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2120                         continue;
2121
2122                 if (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2123                     !!sdata->default_key)
2124                         continue;
2125
2126                 if (!ifsta->auto_channel_sel && bss->freq != freq)
2127                         continue;
2128
2129                 if (!ifsta->auto_bssid_sel &&
2130                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2131                         continue;
2132
2133                 if (!ifsta->auto_ssid_sel &&
2134                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2135                         continue;
2136
2137                 if (!selected || top_rssi < bss->rssi) {
2138                         selected = bss;
2139                         top_rssi = bss->rssi;
2140                 }
2141         }
2142         if (selected)
2143                 atomic_inc(&selected->users);
2144         spin_unlock_bh(&local->sta_bss_lock);
2145
2146         if (selected) {
2147                 ieee80211_set_channel(local, -1, selected->freq);
2148                 if (!ifsta->ssid_set)
2149                         ieee80211_sta_set_ssid(dev, selected->ssid,
2150                                                selected->ssid_len);
2151                 ieee80211_sta_set_bssid(dev, selected->bssid);
2152                 ieee80211_rx_bss_put(dev, selected);
2153                 ifsta->state = IEEE80211_AUTHENTICATE;
2154                 ieee80211_sta_reset_auth(dev, ifsta);
2155                 return 0;
2156         } else {
2157                 if (ifsta->state != IEEE80211_AUTHENTICATE) {
2158                         ieee80211_sta_start_scan(dev, NULL, 0);
2159                         ifsta->state = IEEE80211_AUTHENTICATE;
2160                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2161                 } else
2162                         ifsta->state = IEEE80211_DISABLED;
2163         }
2164         return -1;
2165 }
2166
2167 static int ieee80211_sta_join_ibss(struct net_device *dev,
2168                                    struct ieee80211_if_sta *ifsta,
2169                                    struct ieee80211_sta_bss *bss)
2170 {
2171         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2172         int res, rates, i, j;
2173         struct sk_buff *skb;
2174         struct ieee80211_mgmt *mgmt;
2175         struct ieee80211_tx_control control;
2176         struct ieee80211_rate *rate;
2177         struct ieee80211_hw_mode *mode;
2178         struct rate_control_extra extra;
2179         u8 *pos;
2180         struct ieee80211_sub_if_data *sdata;
2181
2182         /* Remove possible STA entries from other IBSS networks. */
2183         sta_info_flush(local, NULL);
2184
2185         if (local->ops->reset_tsf) {
2186                 /* Reset own TSF to allow time synchronization work. */
2187                 local->ops->reset_tsf(local_to_hw(local));
2188         }
2189         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2190         res = ieee80211_if_config(dev);
2191         if (res)
2192                 return res;
2193
2194         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2195
2196         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2197         sdata->drop_unencrypted = bss->capability &
2198                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2199
2200         res = ieee80211_set_channel(local, -1, bss->freq);
2201
2202         if (!(local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)) {
2203                 printk(KERN_DEBUG "%s: IBSS not allowed on channel %d "
2204                        "(%d MHz)\n", dev->name, local->hw.conf.channel,
2205                        local->hw.conf.freq);
2206                 return -1;
2207         }
2208
2209         /* Set beacon template based on scan results */
2210         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2211         do {
2212                 if (!skb)
2213                         break;
2214
2215                 skb_reserve(skb, local->hw.extra_tx_headroom);
2216
2217                 mgmt = (struct ieee80211_mgmt *)
2218                         skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2219                 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2220                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2221                                                    IEEE80211_STYPE_BEACON);
2222                 memset(mgmt->da, 0xff, ETH_ALEN);
2223                 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
2224                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2225                 mgmt->u.beacon.beacon_int =
2226                         cpu_to_le16(local->hw.conf.beacon_int);
2227                 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2228
2229                 pos = skb_put(skb, 2 + ifsta->ssid_len);
2230                 *pos++ = WLAN_EID_SSID;
2231                 *pos++ = ifsta->ssid_len;
2232                 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2233
2234                 rates = bss->supp_rates_len;
2235                 if (rates > 8)
2236                         rates = 8;
2237                 pos = skb_put(skb, 2 + rates);
2238                 *pos++ = WLAN_EID_SUPP_RATES;
2239                 *pos++ = rates;
2240                 memcpy(pos, bss->supp_rates, rates);
2241
2242                 pos = skb_put(skb, 2 + 1);
2243                 *pos++ = WLAN_EID_DS_PARAMS;
2244                 *pos++ = 1;
2245                 *pos++ = bss->channel;
2246
2247                 pos = skb_put(skb, 2 + 2);
2248                 *pos++ = WLAN_EID_IBSS_PARAMS;
2249                 *pos++ = 2;
2250                 /* FIX: set ATIM window based on scan results */
2251                 *pos++ = 0;
2252                 *pos++ = 0;
2253
2254                 if (bss->supp_rates_len > 8) {
2255                         rates = bss->supp_rates_len - 8;
2256                         pos = skb_put(skb, 2 + rates);
2257                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
2258                         *pos++ = rates;
2259                         memcpy(pos, &bss->supp_rates[8], rates);
2260                 }
2261
2262                 memset(&control, 0, sizeof(control));
2263                 memset(&extra, 0, sizeof(extra));
2264                 extra.mode = local->oper_hw_mode;
2265                 rate = rate_control_get_rate(local, dev, skb, &extra);
2266                 if (!rate) {
2267                         printk(KERN_DEBUG "%s: Failed to determine TX rate "
2268                                "for IBSS beacon\n", dev->name);
2269                         break;
2270                 }
2271                 control.tx_rate = (local->short_preamble &&
2272                                    (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
2273                         rate->val2 : rate->val;
2274                 control.antenna_sel_tx = local->hw.conf.antenna_sel_tx;
2275                 control.power_level = local->hw.conf.power_level;
2276                 control.flags |= IEEE80211_TXCTL_NO_ACK;
2277                 control.retry_limit = 1;
2278
2279                 ifsta->probe_resp = skb_copy(skb, GFP_ATOMIC);
2280                 if (ifsta->probe_resp) {
2281                         mgmt = (struct ieee80211_mgmt *)
2282                                 ifsta->probe_resp->data;
2283                         mgmt->frame_control =
2284                                 IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2285                                              IEEE80211_STYPE_PROBE_RESP);
2286                 } else {
2287                         printk(KERN_DEBUG "%s: Could not allocate ProbeResp "
2288                                "template for IBSS\n", dev->name);
2289                 }
2290
2291                 if (local->ops->beacon_update &&
2292                     local->ops->beacon_update(local_to_hw(local),
2293                                              skb, &control) == 0) {
2294                         printk(KERN_DEBUG "%s: Configured IBSS beacon "
2295                                "template based on scan results\n", dev->name);
2296                         skb = NULL;
2297                 }
2298
2299                 rates = 0;
2300                 mode = local->oper_hw_mode;
2301                 for (i = 0; i < bss->supp_rates_len; i++) {
2302                         int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2303                         if (mode->mode == MODE_ATHEROS_TURBO)
2304                                 bitrate *= 2;
2305                         for (j = 0; j < mode->num_rates; j++)
2306                                 if (mode->rates[j].rate == bitrate)
2307                                         rates |= BIT(j);
2308                 }
2309                 ifsta->supp_rates_bits = rates;
2310         } while (0);
2311
2312         if (skb) {
2313                 printk(KERN_DEBUG "%s: Failed to configure IBSS beacon "
2314                        "template\n", dev->name);
2315                 dev_kfree_skb(skb);
2316         }
2317
2318         ifsta->state = IEEE80211_IBSS_JOINED;
2319         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2320
2321         ieee80211_rx_bss_put(dev, bss);
2322
2323         return res;
2324 }
2325
2326
2327 static int ieee80211_sta_create_ibss(struct net_device *dev,
2328                                      struct ieee80211_if_sta *ifsta)
2329 {
2330         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2331         struct ieee80211_sta_bss *bss;
2332         struct ieee80211_sub_if_data *sdata;
2333         struct ieee80211_hw_mode *mode;
2334         u8 bssid[ETH_ALEN], *pos;
2335         int i;
2336
2337 #if 0
2338         /* Easier testing, use fixed BSSID. */
2339         memset(bssid, 0xfe, ETH_ALEN);
2340 #else
2341         /* Generate random, not broadcast, locally administered BSSID. Mix in
2342          * own MAC address to make sure that devices that do not have proper
2343          * random number generator get different BSSID. */
2344         get_random_bytes(bssid, ETH_ALEN);
2345         for (i = 0; i < ETH_ALEN; i++)
2346                 bssid[i] ^= dev->dev_addr[i];
2347         bssid[0] &= ~0x01;
2348         bssid[0] |= 0x02;
2349 #endif
2350
2351         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID " MAC_FMT "\n",
2352                dev->name, MAC_ARG(bssid));
2353
2354         bss = ieee80211_rx_bss_add(dev, bssid);
2355         if (!bss)
2356                 return -ENOMEM;
2357
2358         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2359         mode = local->oper_hw_mode;
2360
2361         if (local->hw.conf.beacon_int == 0)
2362                 local->hw.conf.beacon_int = 100;
2363         bss->beacon_int = local->hw.conf.beacon_int;
2364         bss->hw_mode = local->hw.conf.phymode;
2365         bss->channel = local->hw.conf.channel;
2366         bss->freq = local->hw.conf.freq;
2367         bss->last_update = jiffies;
2368         bss->capability = WLAN_CAPABILITY_IBSS;
2369         if (sdata->default_key) {
2370                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2371         } else
2372                 sdata->drop_unencrypted = 0;
2373         bss->supp_rates_len = mode->num_rates;
2374         pos = bss->supp_rates;
2375         for (i = 0; i < mode->num_rates; i++) {
2376                 int rate = mode->rates[i].rate;
2377                 if (mode->mode == MODE_ATHEROS_TURBO)
2378                         rate /= 2;
2379                 *pos++ = (u8) (rate / 5);
2380         }
2381
2382         return ieee80211_sta_join_ibss(dev, ifsta, bss);
2383 }
2384
2385
2386 static int ieee80211_sta_find_ibss(struct net_device *dev,
2387                                    struct ieee80211_if_sta *ifsta)
2388 {
2389         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2390         struct ieee80211_sta_bss *bss;
2391         int found = 0;
2392         u8 bssid[ETH_ALEN];
2393         int active_ibss;
2394
2395         if (ifsta->ssid_len == 0)
2396                 return -EINVAL;
2397
2398         active_ibss = ieee80211_sta_active_ibss(dev);
2399 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2400         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2401                dev->name, active_ibss);
2402 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2403         spin_lock_bh(&local->sta_bss_lock);
2404         list_for_each_entry(bss, &local->sta_bss_list, list) {
2405                 if (ifsta->ssid_len != bss->ssid_len ||
2406                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2407                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2408                         continue;
2409 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2410                 printk(KERN_DEBUG "   bssid=" MAC_FMT " found\n",
2411                        MAC_ARG(bss->bssid));
2412 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2413                 memcpy(bssid, bss->bssid, ETH_ALEN);
2414                 found = 1;
2415                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2416                         break;
2417         }
2418         spin_unlock_bh(&local->sta_bss_lock);
2419
2420 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2421         printk(KERN_DEBUG "   sta_find_ibss: selected " MAC_FMT " current "
2422                MAC_FMT "\n", MAC_ARG(bssid), MAC_ARG(ifsta->bssid));
2423 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2424         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
2425             (bss = ieee80211_rx_bss_get(dev, bssid))) {
2426                 printk(KERN_DEBUG "%s: Selected IBSS BSSID " MAC_FMT
2427                        " based on configured SSID\n",
2428                        dev->name, MAC_ARG(bssid));
2429                 return ieee80211_sta_join_ibss(dev, ifsta, bss);
2430         }
2431 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2432         printk(KERN_DEBUG "   did not try to join ibss\n");
2433 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2434
2435         /* Selected IBSS not found in current scan results - try to scan */
2436         if (ifsta->state == IEEE80211_IBSS_JOINED &&
2437             !ieee80211_sta_active_ibss(dev)) {
2438                 mod_timer(&ifsta->timer, jiffies +
2439                                       IEEE80211_IBSS_MERGE_INTERVAL);
2440         } else if (time_after(jiffies, local->last_scan_completed +
2441                               IEEE80211_SCAN_INTERVAL)) {
2442                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2443                        "join\n", dev->name);
2444                 return ieee80211_sta_req_scan(dev, ifsta->ssid,
2445                                               ifsta->ssid_len);
2446         } else if (ifsta->state != IEEE80211_IBSS_JOINED) {
2447                 int interval = IEEE80211_SCAN_INTERVAL;
2448
2449                 if (time_after(jiffies, ifsta->ibss_join_req +
2450                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2451                         if (ifsta->create_ibss &&
2452                             local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)
2453                                 return ieee80211_sta_create_ibss(dev, ifsta);
2454                         if (ifsta->create_ibss) {
2455                                 printk(KERN_DEBUG "%s: IBSS not allowed on the"
2456                                        " configured channel %d (%d MHz)\n",
2457                                        dev->name, local->hw.conf.channel,
2458                                        local->hw.conf.freq);
2459                         }
2460
2461                         /* No IBSS found - decrease scan interval and continue
2462                          * scanning. */
2463                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2464                 }
2465
2466                 ifsta->state = IEEE80211_IBSS_SEARCH;
2467                 mod_timer(&ifsta->timer, jiffies + interval);
2468                 return 0;
2469         }
2470
2471         return 0;
2472 }
2473
2474
2475 int ieee80211_sta_set_ssid(struct net_device *dev, char *ssid, size_t len)
2476 {
2477         struct ieee80211_sub_if_data *sdata;
2478         struct ieee80211_if_sta *ifsta;
2479         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2480
2481         if (len > IEEE80211_MAX_SSID_LEN)
2482                 return -EINVAL;
2483
2484         /* TODO: This should always be done for IBSS, even if IEEE80211_QOS is
2485          * not defined. */
2486         if (local->ops->conf_tx) {
2487                 struct ieee80211_tx_queue_params qparam;
2488                 int i;
2489
2490                 memset(&qparam, 0, sizeof(qparam));
2491                 /* TODO: are these ok defaults for all hw_modes? */
2492                 qparam.aifs = 2;
2493                 qparam.cw_min =
2494                         local->hw.conf.phymode == MODE_IEEE80211B ? 31 : 15;
2495                 qparam.cw_max = 1023;
2496                 qparam.burst_time = 0;
2497                 for (i = IEEE80211_TX_QUEUE_DATA0; i < NUM_TX_DATA_QUEUES; i++)
2498                 {
2499                         local->ops->conf_tx(local_to_hw(local),
2500                                            i + IEEE80211_TX_QUEUE_DATA0,
2501                                            &qparam);
2502                 }
2503                 /* IBSS uses different parameters for Beacon sending */
2504                 qparam.cw_min++;
2505                 qparam.cw_min *= 2;
2506                 qparam.cw_min--;
2507                 local->ops->conf_tx(local_to_hw(local),
2508                                    IEEE80211_TX_QUEUE_BEACON, &qparam);
2509         }
2510
2511         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2512         ifsta = &sdata->u.sta;
2513
2514         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0)
2515                 ifsta->prev_bssid_set = 0;
2516         memcpy(ifsta->ssid, ssid, len);
2517         memset(ifsta->ssid + len, 0, IEEE80211_MAX_SSID_LEN - len);
2518         ifsta->ssid_len = len;
2519
2520         ifsta->ssid_set = len ? 1 : 0;
2521         if (sdata->type == IEEE80211_IF_TYPE_IBSS && !ifsta->bssid_set) {
2522                 ifsta->ibss_join_req = jiffies;
2523                 ifsta->state = IEEE80211_IBSS_SEARCH;
2524                 return ieee80211_sta_find_ibss(dev, ifsta);
2525         }
2526         return 0;
2527 }
2528
2529
2530 int ieee80211_sta_get_ssid(struct net_device *dev, char *ssid, size_t *len)
2531 {
2532         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2533         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2534         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2535         *len = ifsta->ssid_len;
2536         return 0;
2537 }
2538
2539
2540 int ieee80211_sta_set_bssid(struct net_device *dev, u8 *bssid)
2541 {
2542         struct ieee80211_sub_if_data *sdata;
2543         struct ieee80211_if_sta *ifsta;
2544         int res;
2545
2546         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2547         ifsta = &sdata->u.sta;
2548
2549         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2550                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2551                 res = ieee80211_if_config(dev);
2552                 if (res) {
2553                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2554                                "the low-level driver\n", dev->name);
2555                         return res;
2556                 }
2557         }
2558
2559         if (!is_valid_ether_addr(bssid))
2560                 ifsta->bssid_set = 0;
2561         else
2562                 ifsta->bssid_set = 1;
2563         return 0;
2564 }
2565
2566
2567 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
2568                                     struct ieee80211_sub_if_data *sdata,
2569                                     int powersave)
2570 {
2571         struct sk_buff *skb;
2572         struct ieee80211_hdr *nullfunc;
2573         u16 fc;
2574
2575         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2576         if (!skb) {
2577                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2578                        "frame\n", sdata->dev->name);
2579                 return;
2580         }
2581         skb_reserve(skb, local->hw.extra_tx_headroom);
2582
2583         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2584         memset(nullfunc, 0, 24);
2585         fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2586              IEEE80211_FCTL_TODS;
2587         if (powersave)
2588                 fc |= IEEE80211_FCTL_PM;
2589         nullfunc->frame_control = cpu_to_le16(fc);
2590         memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
2591         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2592         memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
2593
2594         ieee80211_sta_tx(sdata->dev, skb, 0);
2595 }
2596
2597
2598 void ieee80211_scan_completed(struct ieee80211_hw *hw)
2599 {
2600         struct ieee80211_local *local = hw_to_local(hw);
2601         struct net_device *dev = local->scan_dev;
2602         struct ieee80211_sub_if_data *sdata;
2603         union iwreq_data wrqu;
2604
2605         local->last_scan_completed = jiffies;
2606         wmb();
2607         local->sta_scanning = 0;
2608
2609         if (ieee80211_hw_config(local))
2610                 printk(KERN_DEBUG "%s: failed to restore operational"
2611                        "channel after scan\n", dev->name);
2612
2613         if (!(local->hw.flags & IEEE80211_HW_NO_PROBE_FILTERING) &&
2614             ieee80211_if_config(dev))
2615                 printk(KERN_DEBUG "%s: failed to restore operational"
2616                        "BSSID after scan\n", dev->name);
2617
2618         memset(&wrqu, 0, sizeof(wrqu));
2619         wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
2620
2621         read_lock(&local->sub_if_lock);
2622         list_for_each_entry(sdata, &local->sub_if_list, list) {
2623
2624                 /* No need to wake the master device. */
2625                 if (sdata->dev == local->mdev)
2626                         continue;
2627
2628                 if (sdata->type == IEEE80211_IF_TYPE_STA) {
2629                         if (sdata->u.sta.associated)
2630                                 ieee80211_send_nullfunc(local, sdata, 0);
2631                         ieee80211_sta_timer((unsigned long)sdata);
2632                 }
2633
2634                 netif_wake_queue(sdata->dev);
2635         }
2636         read_unlock(&local->sub_if_lock);
2637
2638         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2639         if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
2640                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2641                 if (!ifsta->bssid_set ||
2642                     (!ifsta->state == IEEE80211_IBSS_JOINED &&
2643                     !ieee80211_sta_active_ibss(dev)))
2644                         ieee80211_sta_find_ibss(dev, ifsta);
2645         }
2646 }
2647 EXPORT_SYMBOL(ieee80211_scan_completed);
2648
2649 void ieee80211_sta_scan_work(struct work_struct *work)
2650 {
2651         struct ieee80211_local *local =
2652                 container_of(work, struct ieee80211_local, scan_work.work);
2653         struct net_device *dev = local->scan_dev;
2654         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2655         struct ieee80211_hw_mode *mode;
2656         struct ieee80211_channel *chan;
2657         int skip;
2658         unsigned long next_delay = 0;
2659
2660         if (!local->sta_scanning)
2661                 return;
2662
2663         switch (local->scan_state) {
2664         case SCAN_SET_CHANNEL:
2665                 mode = local->scan_hw_mode;
2666                 if (local->scan_hw_mode->list.next == &local->modes_list &&
2667                     local->scan_channel_idx >= mode->num_channels) {
2668                         ieee80211_scan_completed(local_to_hw(local));
2669                         return;
2670                 }
2671                 skip = !(local->enabled_modes & (1 << mode->mode));
2672                 chan = &mode->channels[local->scan_channel_idx];
2673                 if (!(chan->flag & IEEE80211_CHAN_W_SCAN) ||
2674                     (sdata->type == IEEE80211_IF_TYPE_IBSS &&
2675                      !(chan->flag & IEEE80211_CHAN_W_IBSS)) ||
2676                     (local->hw_modes & local->enabled_modes &
2677                      (1 << MODE_IEEE80211G) && mode->mode == MODE_IEEE80211B))
2678                         skip = 1;
2679
2680                 if (!skip) {
2681 #if 0
2682                         printk(KERN_DEBUG "%s: scan channel %d (%d MHz)\n",
2683                                dev->name, chan->chan, chan->freq);
2684 #endif
2685
2686                         local->scan_channel = chan;
2687                         if (ieee80211_hw_config(local)) {
2688                                 printk(KERN_DEBUG "%s: failed to set channel "
2689                                        "%d (%d MHz) for scan\n", dev->name,
2690                                        chan->chan, chan->freq);
2691                                 skip = 1;
2692                         }
2693                 }
2694
2695                 local->scan_channel_idx++;
2696                 if (local->scan_channel_idx >= local->scan_hw_mode->num_channels) {
2697                         if (local->scan_hw_mode->list.next != &local->modes_list) {
2698                                 local->scan_hw_mode = list_entry(local->scan_hw_mode->list.next,
2699                                                                  struct ieee80211_hw_mode,
2700                                                                  list);
2701                                 local->scan_channel_idx = 0;
2702                         }
2703                 }
2704
2705                 if (skip)
2706                         break;
2707
2708                 next_delay = IEEE80211_PROBE_DELAY +
2709                              usecs_to_jiffies(local->hw.channel_change_time);
2710                 local->scan_state = SCAN_SEND_PROBE;
2711                 break;
2712         case SCAN_SEND_PROBE:
2713                 if (local->scan_channel->flag & IEEE80211_CHAN_W_ACTIVE_SCAN) {
2714                         ieee80211_send_probe_req(dev, NULL, local->scan_ssid,
2715                                                  local->scan_ssid_len);
2716                         next_delay = IEEE80211_CHANNEL_TIME;
2717                 } else
2718                         next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
2719                 local->scan_state = SCAN_SET_CHANNEL;
2720                 break;
2721         }
2722
2723         if (local->sta_scanning)
2724                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2725                                    next_delay);
2726 }
2727
2728
2729 static int ieee80211_sta_start_scan(struct net_device *dev,
2730                                     u8 *ssid, size_t ssid_len)
2731 {
2732         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2733         struct ieee80211_sub_if_data *sdata;
2734
2735         if (ssid_len > IEEE80211_MAX_SSID_LEN)
2736                 return -EINVAL;
2737
2738         /* MLME-SCAN.request (page 118)  page 144 (11.1.3.1)
2739          * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
2740          * BSSID: MACAddress
2741          * SSID
2742          * ScanType: ACTIVE, PASSIVE
2743          * ProbeDelay: delay (in microseconds) to be used prior to transmitting
2744          *    a Probe frame during active scanning
2745          * ChannelList
2746          * MinChannelTime (>= ProbeDelay), in TU
2747          * MaxChannelTime: (>= MinChannelTime), in TU
2748          */
2749
2750          /* MLME-SCAN.confirm
2751           * BSSDescriptionSet
2752           * ResultCode: SUCCESS, INVALID_PARAMETERS
2753          */
2754
2755         if (local->sta_scanning) {
2756                 if (local->scan_dev == dev)
2757                         return 0;
2758                 return -EBUSY;
2759         }
2760
2761         if (local->ops->hw_scan) {
2762                 int rc = local->ops->hw_scan(local_to_hw(local),
2763                                             ssid, ssid_len);
2764                 if (!rc) {
2765                         local->sta_scanning = 1;
2766                         local->scan_dev = dev;
2767                 }
2768                 return rc;
2769         }
2770
2771         local->sta_scanning = 1;
2772
2773         read_lock(&local->sub_if_lock);
2774         list_for_each_entry(sdata, &local->sub_if_list, list) {
2775
2776                 /* Don't stop the master interface, otherwise we can't transmit
2777                  * probes! */
2778                 if (sdata->dev == local->mdev)
2779                         continue;
2780
2781                 netif_stop_queue(sdata->dev);
2782                 if (sdata->type == IEEE80211_IF_TYPE_STA &&
2783                     sdata->u.sta.associated)
2784                         ieee80211_send_nullfunc(local, sdata, 1);
2785         }
2786         read_unlock(&local->sub_if_lock);
2787
2788         if (ssid) {
2789                 local->scan_ssid_len = ssid_len;
2790                 memcpy(local->scan_ssid, ssid, ssid_len);
2791         } else
2792                 local->scan_ssid_len = 0;
2793         local->scan_state = SCAN_SET_CHANNEL;
2794         local->scan_hw_mode = list_entry(local->modes_list.next,
2795                                          struct ieee80211_hw_mode,
2796                                          list);
2797         local->scan_channel_idx = 0;
2798         local->scan_dev = dev;
2799
2800         if (!(local->hw.flags & IEEE80211_HW_NO_PROBE_FILTERING) &&
2801             ieee80211_if_config(dev))
2802                 printk(KERN_DEBUG "%s: failed to set BSSID for scan\n",
2803                        dev->name);
2804
2805         /* TODO: start scan as soon as all nullfunc frames are ACKed */
2806         queue_delayed_work(local->hw.workqueue, &local->scan_work,
2807                            IEEE80211_CHANNEL_TIME);
2808
2809         return 0;
2810 }
2811
2812
2813 int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
2814 {
2815         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2816         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2817         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2818
2819         if (sdata->type != IEEE80211_IF_TYPE_STA)
2820                 return ieee80211_sta_start_scan(dev, ssid, ssid_len);
2821
2822         if (local->sta_scanning) {
2823                 if (local->scan_dev == dev)
2824                         return 0;
2825                 return -EBUSY;
2826         }
2827
2828         set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
2829         queue_work(local->hw.workqueue, &ifsta->work);
2830         return 0;
2831 }
2832
2833 static char *
2834 ieee80211_sta_scan_result(struct net_device *dev,
2835                           struct ieee80211_sta_bss *bss,
2836                           char *current_ev, char *end_buf)
2837 {
2838         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2839         struct iw_event iwe;
2840
2841         if (time_after(jiffies,
2842                        bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
2843                 return current_ev;
2844
2845         if (!(local->enabled_modes & (1 << bss->hw_mode)))
2846                 return current_ev;
2847
2848         if (local->scan_flags & IEEE80211_SCAN_WPA_ONLY &&
2849             !bss->wpa_ie && !bss->rsn_ie)
2850                 return current_ev;
2851
2852         if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID &&
2853             (local->scan_ssid_len != bss->ssid_len ||
2854              memcmp(local->scan_ssid, bss->ssid, bss->ssid_len) != 0))
2855                 return current_ev;
2856
2857         memset(&iwe, 0, sizeof(iwe));
2858         iwe.cmd = SIOCGIWAP;
2859         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2860         memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2861         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2862                                           IW_EV_ADDR_LEN);
2863
2864         memset(&iwe, 0, sizeof(iwe));
2865         iwe.cmd = SIOCGIWESSID;
2866         iwe.u.data.length = bss->ssid_len;
2867         iwe.u.data.flags = 1;
2868         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2869                                           bss->ssid);
2870
2871         if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)) {
2872                 memset(&iwe, 0, sizeof(iwe));
2873                 iwe.cmd = SIOCGIWMODE;
2874                 if (bss->capability & WLAN_CAPABILITY_ESS)
2875                         iwe.u.mode = IW_MODE_MASTER;
2876                 else
2877                         iwe.u.mode = IW_MODE_ADHOC;
2878                 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2879                                                   IW_EV_UINT_LEN);
2880         }
2881
2882         memset(&iwe, 0, sizeof(iwe));
2883         iwe.cmd = SIOCGIWFREQ;
2884         iwe.u.freq.m = bss->channel;
2885         iwe.u.freq.e = 0;
2886         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2887                                           IW_EV_FREQ_LEN);
2888         iwe.u.freq.m = bss->freq * 100000;
2889         iwe.u.freq.e = 1;
2890         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2891                                           IW_EV_FREQ_LEN);
2892
2893         memset(&iwe, 0, sizeof(iwe));
2894         iwe.cmd = IWEVQUAL;
2895         iwe.u.qual.qual = bss->signal;
2896         iwe.u.qual.level = bss->rssi;
2897         iwe.u.qual.noise = bss->noise;
2898         iwe.u.qual.updated = local->wstats_flags;
2899         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2900                                           IW_EV_QUAL_LEN);
2901
2902         memset(&iwe, 0, sizeof(iwe));
2903         iwe.cmd = SIOCGIWENCODE;
2904         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
2905                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2906         else
2907                 iwe.u.data.flags = IW_ENCODE_DISABLED;
2908         iwe.u.data.length = 0;
2909         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, "");
2910
2911         if (bss && bss->wpa_ie) {
2912                 memset(&iwe, 0, sizeof(iwe));
2913                 iwe.cmd = IWEVGENIE;
2914                 iwe.u.data.length = bss->wpa_ie_len;
2915                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2916                                                   bss->wpa_ie);
2917         }
2918
2919         if (bss && bss->rsn_ie) {
2920                 memset(&iwe, 0, sizeof(iwe));
2921                 iwe.cmd = IWEVGENIE;
2922                 iwe.u.data.length = bss->rsn_ie_len;
2923                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2924                                                   bss->rsn_ie);
2925         }
2926
2927         if (bss && bss->supp_rates_len > 0) {
2928                 /* display all supported rates in readable format */
2929                 char *p = current_ev + IW_EV_LCP_LEN;
2930                 int i;
2931
2932                 memset(&iwe, 0, sizeof(iwe));
2933                 iwe.cmd = SIOCGIWRATE;
2934                 /* Those two flags are ignored... */
2935                 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2936
2937                 for (i = 0; i < bss->supp_rates_len; i++) {
2938                         iwe.u.bitrate.value = ((bss->supp_rates[i] &
2939                                                         0x7f) * 500000);
2940                         p = iwe_stream_add_value(current_ev, p,
2941                                         end_buf, &iwe, IW_EV_PARAM_LEN);
2942                 }
2943                 current_ev = p;
2944         }
2945
2946         if (bss) {
2947                 char *buf;
2948                 buf = kmalloc(30, GFP_ATOMIC);
2949                 if (buf) {
2950                         memset(&iwe, 0, sizeof(iwe));
2951                         iwe.cmd = IWEVCUSTOM;
2952                         sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
2953                         iwe.u.data.length = strlen(buf);
2954                         current_ev = iwe_stream_add_point(current_ev, end_buf,
2955                                                           &iwe, buf);
2956                         kfree(buf);
2957                 }
2958         }
2959
2960         do {
2961                 char *buf;
2962
2963                 if (!(local->scan_flags & IEEE80211_SCAN_EXTRA_INFO))
2964                         break;
2965
2966                 buf = kmalloc(100, GFP_ATOMIC);
2967                 if (!buf)
2968                         break;
2969
2970                 memset(&iwe, 0, sizeof(iwe));
2971                 iwe.cmd = IWEVCUSTOM;
2972                 sprintf(buf, "bcn_int=%d", bss->beacon_int);
2973                 iwe.u.data.length = strlen(buf);
2974                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2975                                                   buf);
2976
2977                 memset(&iwe, 0, sizeof(iwe));
2978                 iwe.cmd = IWEVCUSTOM;
2979                 sprintf(buf, "capab=0x%04x", bss->capability);
2980                 iwe.u.data.length = strlen(buf);
2981                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2982                                                   buf);
2983
2984                 kfree(buf);
2985                 break;
2986         } while (0);
2987
2988         return current_ev;
2989 }
2990
2991
2992 int ieee80211_sta_scan_results(struct net_device *dev, char *buf, size_t len)
2993 {
2994         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2995         char *current_ev = buf;
2996         char *end_buf = buf + len;
2997         struct ieee80211_sta_bss *bss;
2998
2999         spin_lock_bh(&local->sta_bss_lock);
3000         list_for_each_entry(bss, &local->sta_bss_list, list) {
3001                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3002                         spin_unlock_bh(&local->sta_bss_lock);
3003                         return -E2BIG;
3004                 }
3005                 current_ev = ieee80211_sta_scan_result(dev, bss, current_ev,
3006                                                        end_buf);
3007         }
3008         spin_unlock_bh(&local->sta_bss_lock);
3009         return current_ev - buf;
3010 }
3011
3012
3013 int ieee80211_sta_set_extra_ie(struct net_device *dev, char *ie, size_t len)
3014 {
3015         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3016         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3017         kfree(ifsta->extra_ie);
3018         if (len == 0) {
3019                 ifsta->extra_ie = NULL;
3020                 ifsta->extra_ie_len = 0;
3021                 return 0;
3022         }
3023         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
3024         if (!ifsta->extra_ie) {
3025                 ifsta->extra_ie_len = 0;
3026                 return -ENOMEM;
3027         }
3028         memcpy(ifsta->extra_ie, ie, len);
3029         ifsta->extra_ie_len = len;
3030         return 0;
3031 }
3032
3033
3034 struct sta_info * ieee80211_ibss_add_sta(struct net_device *dev,
3035                                          struct sk_buff *skb, u8 *bssid,
3036                                          u8 *addr)
3037 {
3038         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3039         struct sta_info *sta;
3040         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3041
3042         /* TODO: Could consider removing the least recently used entry and
3043          * allow new one to be added. */
3044         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
3045                 if (net_ratelimit()) {
3046                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
3047                                "entry " MAC_FMT "\n", dev->name, MAC_ARG(addr));
3048                 }
3049                 return NULL;
3050         }
3051
3052         printk(KERN_DEBUG "%s: Adding new IBSS station " MAC_FMT " (dev=%s)\n",
3053                local->mdev->name, MAC_ARG(addr), dev->name);
3054
3055         sta = sta_info_add(local, dev, addr, GFP_ATOMIC);
3056         if (!sta)
3057                 return NULL;
3058
3059         sta->supp_rates = sdata->u.sta.supp_rates_bits;
3060
3061         rate_control_rate_init(sta, local);
3062
3063         return sta; /* caller will call sta_info_put() */
3064 }
3065
3066
3067 int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason)
3068 {
3069         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3070         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3071
3072         printk(KERN_DEBUG "%s: deauthenticate(reason=%d)\n",
3073                dev->name, reason);
3074
3075         if (sdata->type != IEEE80211_IF_TYPE_STA &&
3076             sdata->type != IEEE80211_IF_TYPE_IBSS)
3077                 return -EINVAL;
3078
3079         ieee80211_send_deauth(dev, ifsta, reason);
3080         ieee80211_set_disassoc(dev, ifsta, 1);
3081         return 0;
3082 }
3083
3084
3085 int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
3086 {
3087         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3088         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3089
3090         printk(KERN_DEBUG "%s: disassociate(reason=%d)\n",
3091                dev->name, reason);
3092
3093         if (sdata->type != IEEE80211_IF_TYPE_STA)
3094                 return -EINVAL;
3095
3096         if (!ifsta->associated)
3097                 return -1;
3098
3099         ieee80211_send_disassoc(dev, ifsta, reason);
3100         ieee80211_set_disassoc(dev, ifsta, 0);
3101         return 0;
3102 }