err.no Git - linux-2.6/blob - 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         int preamble_mode = (erp_value & WLAN_ERP_BARKER_PREAMBLE) != 0;
 322         u8 changes = 0;
 323
 324         if (use_protection != sdata->use_protection) {
 325                 if (net_ratelimit()) {
 326                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
 327                                MAC_FMT ")\n",
 328                                dev->name,
 329                                use_protection ? "enabled" : "disabled",
 330                                MAC_ARG(ifsta->bssid));
 331                 }
 332                 sdata->use_protection = use_protection;
 333                 changes |= IEEE80211_ERP_CHANGE_PROTECTION;
 334         }
 335
 336         if (!preamble_mode != sdata->short_preamble) {
 337                 if (net_ratelimit()) {
 338                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 339                                " (BSSID=" MAC_FMT ")\n",
 340                                dev->name,
 341                                (preamble_mode == WLAN_ERP_PREAMBLE_SHORT) ?
 342                                         "short" : "long",
 343                                MAC_ARG(ifsta->bssid));
 344                 }
 345                 sdata->short_preamble = !preamble_mode;
 346                 changes |= IEEE80211_ERP_CHANGE_PREAMBLE;
 347         }
 348
 349         if (changes)
 350                 ieee80211_erp_info_change_notify(dev, changes);
 351 }
 352
 353
 354 static void ieee80211_sta_send_associnfo(struct net_device *dev,
 355                                          struct ieee80211_if_sta *ifsta)
 356 {
 357         char *buf;
 358         size_t len;
 359         int i;
 360         union iwreq_data wrqu;
 361
 362         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 363                 return;
 364
 365         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 366                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 367         if (!buf)
 368                 return;
 369
 370         len = sprintf(buf, "ASSOCINFO(");
 371         if (ifsta->assocreq_ies) {
 372                 len += sprintf(buf + len, "ReqIEs=");
 373                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 374                         len += sprintf(buf + len, "%02x",
 375                                        ifsta->assocreq_ies[i]);
 376                 }
 377         }
 378         if (ifsta->assocresp_ies) {
 379                 if (ifsta->assocreq_ies)
 380                         len += sprintf(buf + len, " ");
 381                 len += sprintf(buf + len, "RespIEs=");
 382                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 383                         len += sprintf(buf + len, "%02x",
 384                                        ifsta->assocresp_ies[i]);
 385                 }
 386         }
 387         len += sprintf(buf + len, ")");
 388
 389         if (len > IW_CUSTOM_MAX) {
 390                 len = sprintf(buf, "ASSOCRESPIE=");
 391                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 392                         len += sprintf(buf + len, "%02x",
 393                                        ifsta->assocresp_ies[i]);
 394                 }
 395         }
 396
 397         memset(&wrqu, 0, sizeof(wrqu));
 398         wrqu.data.length = len;
 399         wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 400
 401         kfree(buf);
 402 }
 403
 404
 405 static void ieee80211_set_associated(struct net_device *dev,
 406                                      struct ieee80211_if_sta *ifsta, int assoc)
 407 {
 408         union iwreq_data wrqu;
 409
 410         if (ifsta->associated == assoc)
 411                 return;
 412
 413         ifsta->associated = assoc;
 414
 415         if (assoc) {
 416                 struct ieee80211_sub_if_data *sdata;
 417                 struct ieee80211_sta_bss *bss;
 418                 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 419                 if (sdata->type != IEEE80211_IF_TYPE_STA)
 420                         return;
 421
 422                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
 423                 if (bss) {
 424                         if (bss->has_erp_value)
 425                                 ieee80211_handle_erp_ie(dev, bss->erp_value);
 426                         ieee80211_rx_bss_put(dev, bss);
 427                 }
 428
 429                 netif_carrier_on(dev);
 430                 ifsta->prev_bssid_set = 1;
 431                 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 432                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 433                 ieee80211_sta_send_associnfo(dev, ifsta);
 434         } else {
 435                 netif_carrier_off(dev);
 436                 ieee80211_reset_erp_info(dev);
 437                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 438         }
 439         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 440         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 441         ifsta->last_probe = jiffies;
 442 }
 443
 444 static void ieee80211_set_disassoc(struct net_device *dev,
 445                                    struct ieee80211_if_sta *ifsta, int deauth)
 446 {
 447         if (deauth)
 448                 ifsta->auth_tries = 0;
 449         ifsta->assoc_tries = 0;
 450         ieee80211_set_associated(dev, ifsta, 0);
 451 }
 452
 453 static void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
 454                              int encrypt)
 455 {
 456         struct ieee80211_sub_if_data *sdata;
 457         struct ieee80211_tx_packet_data *pkt_data;
 458
 459         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 460         skb->dev = sdata->local->mdev;
 461         skb_set_mac_header(skb, 0);
 462         skb_set_network_header(skb, 0);
 463         skb_set_transport_header(skb, 0);
 464
 465         pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 466         memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
 467         pkt_data->ifindex = sdata->dev->ifindex;
 468         if (sdata->type == IEEE80211_IF_TYPE_MGMT)
 469                 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
 470         if (!encrypt)
 471                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
 472
 473         dev_queue_xmit(skb);
 474 }
 475
 476
 477 static void ieee80211_send_auth(struct net_device *dev,
 478                                 struct ieee80211_if_sta *ifsta,
 479                                 int transaction, u8 *extra, size_t extra_len,
 480                                 int encrypt)
 481 {
 482         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 483         struct sk_buff *skb;
 484         struct ieee80211_mgmt *mgmt;
 485
 486         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 487                             sizeof(*mgmt) + 6 + extra_len);
 488         if (!skb) {
 489                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 490                        "frame\n", dev->name);
 491                 return;
 492         }
 493         skb_reserve(skb, local->hw.extra_tx_headroom);
 494
 495         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 496         memset(mgmt, 0, 24 + 6);
 497         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 498                                            IEEE80211_STYPE_AUTH);
 499         if (encrypt)
 500                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 501         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 502         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 503         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 504         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 505         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 506         ifsta->auth_transaction = transaction + 1;
 507         mgmt->u.auth.status_code = cpu_to_le16(0);
 508         if (extra)
 509                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 510
 511         ieee80211_sta_tx(dev, skb, encrypt);
 512 }
 513
 514
 515 static void ieee80211_authenticate(struct net_device *dev,
 516                                    struct ieee80211_if_sta *ifsta)
 517 {
 518         ifsta->auth_tries++;
 519         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 520                 printk(KERN_DEBUG "%s: authentication with AP " MAC_FMT
 521                        " timed out\n",
 522                        dev->name, MAC_ARG(ifsta->bssid));
 523                 ifsta->state = IEEE80211_DISABLED;
 524                 return;
 525         }
 526
 527         ifsta->state = IEEE80211_AUTHENTICATE;
 528         printk(KERN_DEBUG "%s: authenticate with AP " MAC_FMT "\n",
 529                dev->name, MAC_ARG(ifsta->bssid));
 530
 531         ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);
 532
 533         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 534 }
 535
 536
 537 static void ieee80211_send_assoc(struct net_device *dev,
 538                                  struct ieee80211_if_sta *ifsta)
 539 {
 540         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 541         struct ieee80211_hw_mode *mode;
 542         struct sk_buff *skb;
 543         struct ieee80211_mgmt *mgmt;
 544         u8 *pos, *ies;
 545         int i, len;
 546         u16 capab;
 547         struct ieee80211_sta_bss *bss;
 548         int wmm = 0;
 549
 550         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 551                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 552                             ifsta->ssid_len);
 553         if (!skb) {
 554                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 555                        "frame\n", dev->name);
 556                 return;
 557         }
 558         skb_reserve(skb, local->hw.extra_tx_headroom);
 559
 560         mode = local->oper_hw_mode;
 561         capab = ifsta->capab;
 562         if (mode->mode == MODE_IEEE80211G) {
 563                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME |
 564                         WLAN_CAPABILITY_SHORT_PREAMBLE;
 565         }
 566         bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
 567         if (bss) {
 568                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 569                         capab |= WLAN_CAPABILITY_PRIVACY;
 570                 if (bss->wmm_ie) {
 571                         wmm = 1;
 572                 }
 573                 ieee80211_rx_bss_put(dev, bss);
 574         }
 575
 576         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 577         memset(mgmt, 0, 24);
 578         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 579         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 580         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 581
 582         if (ifsta->prev_bssid_set) {
 583                 skb_put(skb, 10);
 584                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 585                                                    IEEE80211_STYPE_REASSOC_REQ);
 586                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 587                 mgmt->u.reassoc_req.listen_interval = cpu_to_le16(1);
 588                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 589                        ETH_ALEN);
 590         } else {
 591                 skb_put(skb, 4);
 592                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 593                                                    IEEE80211_STYPE_ASSOC_REQ);
 594                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 595                 mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
 596         }
 597
 598         /* SSID */
 599         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 600         *pos++ = WLAN_EID_SSID;
 601         *pos++ = ifsta->ssid_len;
 602         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 603
 604         len = mode->num_rates;
 605         if (len > 8)
 606                 len = 8;
 607         pos = skb_put(skb, len + 2);
 608         *pos++ = WLAN_EID_SUPP_RATES;
 609         *pos++ = len;
 610         for (i = 0; i < len; i++) {
 611                 int rate = mode->rates[i].rate;
 612                 if (mode->mode == MODE_ATHEROS_TURBO)
 613                         rate /= 2;
 614                 *pos++ = (u8) (rate / 5);
 615         }
 616
 617         if (mode->num_rates > len) {
 618                 pos = skb_put(skb, mode->num_rates - len + 2);
 619                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 620                 *pos++ = mode->num_rates - len;
 621                 for (i = len; i < mode->num_rates; i++) {
 622                         int rate = mode->rates[i].rate;
 623                         if (mode->mode == MODE_ATHEROS_TURBO)
 624                                 rate /= 2;
 625                         *pos++ = (u8) (rate / 5);
 626                 }
 627         }
 628
 629         if (ifsta->extra_ie) {
 630                 pos = skb_put(skb, ifsta->extra_ie_len);
 631                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 632         }
 633
 634         if (wmm && ifsta->wmm_enabled) {
 635                 pos = skb_put(skb, 9);
 636                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 637                 *pos++ = 7; /* len */
 638                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 639                 *pos++ = 0x50;
 640                 *pos++ = 0xf2;
 641                 *pos++ = 2; /* WME */
 642                 *pos++ = 0; /* WME info */
 643                 *pos++ = 1; /* WME ver */
 644                 *pos++ = 0;
 645         }
 646
 647         kfree(ifsta->assocreq_ies);
 648         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 649         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 650         if (ifsta->assocreq_ies)
 651                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 652
 653         ieee80211_sta_tx(dev, skb, 0);
 654 }
 655
 656
 657 static void ieee80211_send_deauth(struct net_device *dev,
 658                                   struct ieee80211_if_sta *ifsta, u16 reason)
 659 {
 660         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 661         struct sk_buff *skb;
 662         struct ieee80211_mgmt *mgmt;
 663
 664         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 665         if (!skb) {
 666                 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
 667                        "frame\n", dev->name);
 668                 return;
 669         }
 670         skb_reserve(skb, local->hw.extra_tx_headroom);
 671
 672         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 673         memset(mgmt, 0, 24);
 674         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 675         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 676         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 677         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 678                                            IEEE80211_STYPE_DEAUTH);
 679         skb_put(skb, 2);
 680         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 681
 682         ieee80211_sta_tx(dev, skb, 0);
 683 }
 684
 685
 686 static void ieee80211_send_disassoc(struct net_device *dev,
 687                                     struct ieee80211_if_sta *ifsta, u16 reason)
 688 {
 689         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 690         struct sk_buff *skb;
 691         struct ieee80211_mgmt *mgmt;
 692
 693         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 694         if (!skb) {
 695                 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
 696                        "frame\n", dev->name);
 697                 return;
 698         }
 699         skb_reserve(skb, local->hw.extra_tx_headroom);
 700
 701         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 702         memset(mgmt, 0, 24);
 703         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 704         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 705         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 706         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 707                                            IEEE80211_STYPE_DISASSOC);
 708         skb_put(skb, 2);
 709         mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
 710
 711         ieee80211_sta_tx(dev, skb, 0);
 712 }
 713
 714
 715 static int ieee80211_privacy_mismatch(struct net_device *dev,
 716                                       struct ieee80211_if_sta *ifsta)
 717 {
 718         struct ieee80211_sta_bss *bss;
 719         int res = 0;
 720
 721         if (!ifsta || ifsta->mixed_cell || ifsta->key_management_enabled)
 722                 return 0;
 723
 724         bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
 725         if (!bss)
 726                 return 0;
 727
 728         if (ieee80211_sta_wep_configured(dev) !=
 729             !!(bss->capability & WLAN_CAPABILITY_PRIVACY))
 730                 res = 1;
 731
 732         ieee80211_rx_bss_put(dev, bss);
 733
 734         return res;
 735 }
 736
 737
 738 static void ieee80211_associate(struct net_device *dev,
 739                                 struct ieee80211_if_sta *ifsta)
 740 {
 741         ifsta->assoc_tries++;
 742         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 743                 printk(KERN_DEBUG "%s: association with AP " MAC_FMT
 744                        " timed out\n",
 745                        dev->name, MAC_ARG(ifsta->bssid));
 746                 ifsta->state = IEEE80211_DISABLED;
 747                 return;
 748         }
 749
 750         ifsta->state = IEEE80211_ASSOCIATE;
 751         printk(KERN_DEBUG "%s: associate with AP " MAC_FMT "\n",
 752                dev->name, MAC_ARG(ifsta->bssid));
 753         if (ieee80211_privacy_mismatch(dev, ifsta)) {
 754                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 755                        "mixed-cell disabled - abort association\n", dev->name);
 756                 ifsta->state = IEEE80211_DISABLED;
 757                 return;
 758         }
 759
 760         ieee80211_send_assoc(dev, ifsta);
 761
 762         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 763 }
 764
 765
 766 static void ieee80211_associated(struct net_device *dev,
 767                                  struct ieee80211_if_sta *ifsta)
 768 {
 769         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 770         struct sta_info *sta;
 771         int disassoc;
 772
 773         /* TODO: start monitoring current AP signal quality and number of
 774          * missed beacons. Scan other channels every now and then and search
 775          * for better APs. */
 776         /* TODO: remove expired BSSes */
 777
 778         ifsta->state = IEEE80211_ASSOCIATED;
 779
 780         sta = sta_info_get(local, ifsta->bssid);
 781         if (!sta) {
 782                 printk(KERN_DEBUG "%s: No STA entry for own AP " MAC_FMT "\n",
 783                        dev->name, MAC_ARG(ifsta->bssid));
 784                 disassoc = 1;
 785         } else {
 786                 disassoc = 0;
 787                 if (time_after(jiffies,
 788                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 789                         if (ifsta->probereq_poll) {
 790                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 791                                        "current AP " MAC_FMT " - assume out of "
 792                                        "range\n",
 793                                        dev->name, MAC_ARG(ifsta->bssid));
 794                                 disassoc = 1;
 795                                 sta_info_free(sta);
 796                                 ifsta->probereq_poll = 0;
 797                         } else {
 798                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 799                                                          local->scan_ssid,
 800                                                          local->scan_ssid_len);
 801                                 ifsta->probereq_poll = 1;
 802                         }
 803                 } else {
 804                         ifsta->probereq_poll = 0;
 805                         if (time_after(jiffies, ifsta->last_probe +
 806                                        IEEE80211_PROBE_INTERVAL)) {
 807                                 ifsta->last_probe = jiffies;
 808                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 809                                                          ifsta->ssid,
 810                                                          ifsta->ssid_len);
 811                         }
 812                 }
 813                 sta_info_put(sta);
 814         }
 815         if (disassoc) {
 816                 union iwreq_data wrqu;
 817                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 818                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 819                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 820                 mod_timer(&ifsta->timer, jiffies +
 821                                       IEEE80211_MONITORING_INTERVAL + 30 * HZ);
 822         } else {
 823                 mod_timer(&ifsta->timer, jiffies +
 824                                       IEEE80211_MONITORING_INTERVAL);
 825         }
 826 }
 827
 828
 829 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
 830                                      u8 *ssid, size_t ssid_len)
 831 {
 832         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 833         struct ieee80211_hw_mode *mode;
 834         struct sk_buff *skb;
 835         struct ieee80211_mgmt *mgmt;
 836         u8 *pos, *supp_rates, *esupp_rates = NULL;
 837         int i;
 838
 839         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
 840         if (!skb) {
 841                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 842                        "request\n", dev->name);
 843                 return;
 844         }
 845         skb_reserve(skb, local->hw.extra_tx_headroom);
 846
 847         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 848         memset(mgmt, 0, 24);
 849         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 850                                            IEEE80211_STYPE_PROBE_REQ);
 851         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 852         if (dst) {
 853                 memcpy(mgmt->da, dst, ETH_ALEN);
 854                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 855         } else {
 856                 memset(mgmt->da, 0xff, ETH_ALEN);
 857                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 858         }
 859         pos = skb_put(skb, 2 + ssid_len);
 860         *pos++ = WLAN_EID_SSID;
 861         *pos++ = ssid_len;
 862         memcpy(pos, ssid, ssid_len);
 863
 864         supp_rates = skb_put(skb, 2);
 865         supp_rates[0] = WLAN_EID_SUPP_RATES;
 866         supp_rates[1] = 0;
 867         mode = local->oper_hw_mode;
 868         for (i = 0; i < mode->num_rates; i++) {
 869                 struct ieee80211_rate *rate = &mode->rates[i];
 870                 if (!(rate->flags & IEEE80211_RATE_SUPPORTED))
 871                         continue;
 872                 if (esupp_rates) {
 873                         pos = skb_put(skb, 1);
 874                         esupp_rates[1]++;
 875                 } else if (supp_rates[1] == 8) {
 876                         esupp_rates = skb_put(skb, 3);
 877                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 878                         esupp_rates[1] = 1;
 879                         pos = &esupp_rates[2];
 880                 } else {
 881                         pos = skb_put(skb, 1);
 882                         supp_rates[1]++;
 883                 }
 884                 if (mode->mode == MODE_ATHEROS_TURBO)
 885                         *pos = rate->rate / 10;
 886                 else
 887                         *pos = rate->rate / 5;
 888         }
 889
 890         ieee80211_sta_tx(dev, skb, 0);
 891 }
 892
 893
 894 static int ieee80211_sta_wep_configured(struct net_device *dev)
 895 {
 896         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 897         if (!sdata || !sdata->default_key ||
 898             sdata->default_key->alg != ALG_WEP)
 899                 return 0;
 900         return 1;
 901 }
 902
 903
 904 static void ieee80211_auth_completed(struct net_device *dev,
 905                                      struct ieee80211_if_sta *ifsta)
 906 {
 907         printk(KERN_DEBUG "%s: authenticated\n", dev->name);
 908         ifsta->authenticated = 1;
 909         ieee80211_associate(dev, ifsta);
 910 }
 911
 912
 913 static void ieee80211_auth_challenge(struct net_device *dev,
 914                                      struct ieee80211_if_sta *ifsta,
 915                                      struct ieee80211_mgmt *mgmt,
 916                                      size_t len)
 917 {
 918         u8 *pos;
 919         struct ieee802_11_elems elems;
 920
 921         printk(KERN_DEBUG "%s: replying to auth challenge\n", dev->name);
 922         pos = mgmt->u.auth.variable;
 923         if (ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems)
 924             == ParseFailed) {
 925                 printk(KERN_DEBUG "%s: failed to parse Auth(challenge)\n",
 926                        dev->name);
 927                 return;
 928         }
 929         if (!elems.challenge) {
 930                 printk(KERN_DEBUG "%s: no challenge IE in shared key auth "
 931                        "frame\n", dev->name);
 932                 return;
 933         }
 934         ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
 935                             elems.challenge_len + 2, 1);
 936 }
 937
 938
 939 static void ieee80211_rx_mgmt_auth(struct net_device *dev,
 940                                    struct ieee80211_if_sta *ifsta,
 941                                    struct ieee80211_mgmt *mgmt,
 942                                    size_t len)
 943 {
 944         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 945         u16 auth_alg, auth_transaction, status_code;
 946
 947         if (ifsta->state != IEEE80211_AUTHENTICATE &&
 948             sdata->type != IEEE80211_IF_TYPE_IBSS) {
 949                 printk(KERN_DEBUG "%s: authentication frame received from "
 950                        MAC_FMT ", but not in authenticate state - ignored\n",
 951                        dev->name, MAC_ARG(mgmt->sa));
 952                 return;
 953         }
 954
 955         if (len < 24 + 6) {
 956                 printk(KERN_DEBUG "%s: too short (%zd) authentication frame "
 957                        "received from " MAC_FMT " - ignored\n",
 958                        dev->name, len, MAC_ARG(mgmt->sa));
 959                 return;
 960         }
 961
 962         if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
 963             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
 964                 printk(KERN_DEBUG "%s: authentication frame received from "
 965                        "unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
 966                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
 967                        MAC_ARG(mgmt->bssid));
 968                 return;
 969         }
 970
 971         if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
 972             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) {
 973                 printk(KERN_DEBUG "%s: authentication frame received from "
 974                        "unknown BSSID (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
 975                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
 976                        MAC_ARG(mgmt->bssid));
 977                 return;
 978         }
 979
 980         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 981         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 982         status_code = le16_to_cpu(mgmt->u.auth.status_code);
 983
 984         printk(KERN_DEBUG "%s: RX authentication from " MAC_FMT " (alg=%d "
 985                "transaction=%d status=%d)\n",
 986                dev->name, MAC_ARG(mgmt->sa), auth_alg,
 987                auth_transaction, status_code);
 988
 989         if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
 990                 /* IEEE 802.11 standard does not require authentication in IBSS
 991                  * networks and most implementations do not seem to use it.
 992                  * However, try to reply to authentication attempts if someone
 993                  * has actually implemented this.
 994                  * TODO: Could implement shared key authentication. */
 995                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) {
 996                         printk(KERN_DEBUG "%s: unexpected IBSS authentication "
 997                                "frame (alg=%d transaction=%d)\n",
 998                                dev->name, auth_alg, auth_transaction);
 999                         return;
1000                 }
1001                 ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
1002         }
1003
1004         if (auth_alg != ifsta->auth_alg ||
1005             auth_transaction != ifsta->auth_transaction) {
1006                 printk(KERN_DEBUG "%s: unexpected authentication frame "
1007                        "(alg=%d transaction=%d)\n",
1008                        dev->name, auth_alg, auth_transaction);
1009                 return;
1010         }
1011
1012         if (status_code != WLAN_STATUS_SUCCESS) {
1013                 printk(KERN_DEBUG "%s: AP denied authentication (auth_alg=%d "
1014                        "code=%d)\n", dev->name, ifsta->auth_alg, status_code);
1015                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1016                         u8 algs[3];
1017                         const int num_algs = ARRAY_SIZE(algs);
1018                         int i, pos;
1019                         algs[0] = algs[1] = algs[2] = 0xff;
1020                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1021                                 algs[0] = WLAN_AUTH_OPEN;
1022                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1023                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1024                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1025                                 algs[2] = WLAN_AUTH_LEAP;
1026                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1027                                 pos = 0;
1028                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1029                                 pos = 1;
1030                         else
1031                                 pos = 2;
1032                         for (i = 0; i < num_algs; i++) {
1033                                 pos++;
1034                                 if (pos >= num_algs)
1035                                         pos = 0;
1036                                 if (algs[pos] == ifsta->auth_alg ||
1037                                     algs[pos] == 0xff)
1038                                         continue;
1039                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1040                                     !ieee80211_sta_wep_configured(dev))
1041                                         continue;
1042                                 ifsta->auth_alg = algs[pos];
1043                                 printk(KERN_DEBUG "%s: set auth_alg=%d for "
1044                                        "next try\n",
1045                                        dev->name, ifsta->auth_alg);
1046                                 break;
1047                         }
1048                 }
1049                 return;
1050         }
1051
1052         switch (ifsta->auth_alg) {
1053         case WLAN_AUTH_OPEN:
1054         case WLAN_AUTH_LEAP:
1055                 ieee80211_auth_completed(dev, ifsta);
1056                 break;
1057         case WLAN_AUTH_SHARED_KEY:
1058                 if (ifsta->auth_transaction == 4)
1059                         ieee80211_auth_completed(dev, ifsta);
1060                 else
1061                         ieee80211_auth_challenge(dev, ifsta, mgmt, len);
1062                 break;
1063         }
1064 }
1065
1066
1067 static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
1068                                      struct ieee80211_if_sta *ifsta,
1069                                      struct ieee80211_mgmt *mgmt,
1070                                      size_t len)
1071 {
1072         u16 reason_code;
1073
1074         if (len < 24 + 2) {
1075                 printk(KERN_DEBUG "%s: too short (%zd) deauthentication frame "
1076                        "received from " MAC_FMT " - ignored\n",
1077                        dev->name, len, MAC_ARG(mgmt->sa));
1078                 return;
1079         }
1080
1081         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1082                 printk(KERN_DEBUG "%s: deauthentication frame received from "
1083                        "unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
1084                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
1085                        MAC_ARG(mgmt->bssid));
1086                 return;
1087         }
1088
1089         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1090
1091         printk(KERN_DEBUG "%s: RX deauthentication from " MAC_FMT
1092                " (reason=%d)\n",
1093                dev->name, MAC_ARG(mgmt->sa), reason_code);
1094
1095         if (ifsta->authenticated) {
1096                 printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
1097         }
1098
1099         if (ifsta->state == IEEE80211_AUTHENTICATE ||
1100             ifsta->state == IEEE80211_ASSOCIATE ||
1101             ifsta->state == IEEE80211_ASSOCIATED) {
1102                 ifsta->state = IEEE80211_AUTHENTICATE;
1103                 mod_timer(&ifsta->timer, jiffies +
1104                                       IEEE80211_RETRY_AUTH_INTERVAL);
1105         }
1106
1107         ieee80211_set_disassoc(dev, ifsta, 1);
1108         ifsta->authenticated = 0;
1109 }
1110
1111
1112 static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
1113                                        struct ieee80211_if_sta *ifsta,
1114                                        struct ieee80211_mgmt *mgmt,
1115                                        size_t len)
1116 {
1117         u16 reason_code;
1118
1119         if (len < 24 + 2) {
1120                 printk(KERN_DEBUG "%s: too short (%zd) disassociation frame "
1121                        "received from " MAC_FMT " - ignored\n",
1122                        dev->name, len, MAC_ARG(mgmt->sa));
1123                 return;
1124         }
1125
1126         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1127                 printk(KERN_DEBUG "%s: disassociation frame received from "
1128                        "unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
1129                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
1130                        MAC_ARG(mgmt->bssid));
1131                 return;
1132         }
1133
1134         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1135
1136         printk(KERN_DEBUG "%s: RX disassociation from " MAC_FMT
1137                " (reason=%d)\n",
1138                dev->name, MAC_ARG(mgmt->sa), reason_code);
1139
1140         if (ifsta->associated)
1141                 printk(KERN_DEBUG "%s: disassociated\n", dev->name);
1142
1143         if (ifsta->state == IEEE80211_ASSOCIATED) {
1144                 ifsta->state = IEEE80211_ASSOCIATE;
1145                 mod_timer(&ifsta->timer, jiffies +
1146                                       IEEE80211_RETRY_AUTH_INTERVAL);
1147         }
1148
1149         ieee80211_set_disassoc(dev, ifsta, 0);
1150 }
1151
1152
1153 static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
1154                                          struct ieee80211_if_sta *ifsta,
1155                                          struct ieee80211_mgmt *mgmt,
1156                                          size_t len,
1157                                          int reassoc)
1158 {
1159         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1160         struct ieee80211_hw_mode *mode;
1161         struct sta_info *sta;
1162         u32 rates;
1163         u16 capab_info, status_code, aid;
1164         struct ieee802_11_elems elems;
1165         u8 *pos;
1166         int i, j;
1167
1168         /* AssocResp and ReassocResp have identical structure, so process both
1169          * of them in this function. */
1170
1171         if (ifsta->state != IEEE80211_ASSOCIATE) {
1172                 printk(KERN_DEBUG "%s: association frame received from "
1173                        MAC_FMT ", but not in associate state - ignored\n",
1174                        dev->name, MAC_ARG(mgmt->sa));
1175                 return;
1176         }
1177
1178         if (len < 24 + 6) {
1179                 printk(KERN_DEBUG "%s: too short (%zd) association frame "
1180                        "received from " MAC_FMT " - ignored\n",
1181                        dev->name, len, MAC_ARG(mgmt->sa));
1182                 return;
1183         }
1184
1185         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1186                 printk(KERN_DEBUG "%s: association frame received from "
1187                        "unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
1188                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
1189                        MAC_ARG(mgmt->bssid));
1190                 return;
1191         }
1192
1193         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1194         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1195         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1196         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1197                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1198                        "set\n", dev->name, aid);
1199         aid &= ~(BIT(15) | BIT(14));
1200
1201         printk(KERN_DEBUG "%s: RX %sssocResp from " MAC_FMT " (capab=0x%x "
1202                "status=%d aid=%d)\n",
1203                dev->name, reassoc ? "Rea" : "A", MAC_ARG(mgmt->sa),
1204                capab_info, status_code, aid);
1205
1206         if (status_code != WLAN_STATUS_SUCCESS) {
1207                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1208                        dev->name, status_code);
1209                 /* if this was a reassociation, ensure we try a "full"
1210                  * association next time. This works around some broken APs
1211                  * which do not correctly reject reassociation requests. */
1212                 ifsta->prev_bssid_set = 0;
1213                 return;
1214         }
1215
1216         pos = mgmt->u.assoc_resp.variable;
1217         if (ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems)
1218             == ParseFailed) {
1219                 printk(KERN_DEBUG "%s: failed to parse AssocResp\n",
1220                        dev->name);
1221                 return;
1222         }
1223
1224         if (!elems.supp_rates) {
1225                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1226                        dev->name);
1227                 return;
1228         }
1229
1230         /* it probably doesn't, but if the frame includes an ERP value then
1231          * update our stored copy */
1232         if (elems.erp_info && elems.erp_info_len >= 1) {
1233                 struct ieee80211_sta_bss *bss
1234                         = ieee80211_rx_bss_get(dev, ifsta->bssid);
1235                 if (bss) {
1236                         bss->erp_value = elems.erp_info[0];
1237                         bss->has_erp_value = 1;
1238                         ieee80211_rx_bss_put(dev, bss);
1239                 }
1240         }
1241
1242         printk(KERN_DEBUG "%s: associated\n", dev->name);
1243         ifsta->aid = aid;
1244         ifsta->ap_capab = capab_info;
1245
1246         kfree(ifsta->assocresp_ies);
1247         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1248         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1249         if (ifsta->assocresp_ies)
1250                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1251
1252         ieee80211_set_associated(dev, ifsta, 1);
1253
1254         /* Add STA entry for the AP */
1255         sta = sta_info_get(local, ifsta->bssid);
1256         if (!sta) {
1257                 struct ieee80211_sta_bss *bss;
1258                 sta = sta_info_add(local, dev, ifsta->bssid, GFP_KERNEL);
1259                 if (!sta) {
1260                         printk(KERN_DEBUG "%s: failed to add STA entry for the"
1261                                " AP\n", dev->name);
1262                         return;
1263                 }
1264                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
1265                 if (bss) {
1266                         sta->last_rssi = bss->rssi;
1267                         sta->last_signal = bss->signal;
1268                         sta->last_noise = bss->noise;
1269                         ieee80211_rx_bss_put(dev, bss);
1270                 }
1271         }
1272
1273         sta->dev = dev;
1274         sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC;
1275         sta->assoc_ap = 1;
1276
1277         rates = 0;
1278         mode = local->oper_hw_mode;
1279         for (i = 0; i < elems.supp_rates_len; i++) {
1280                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1281                 if (mode->mode == MODE_ATHEROS_TURBO)
1282                         rate *= 2;
1283                 for (j = 0; j < mode->num_rates; j++)
1284                         if (mode->rates[j].rate == rate)
1285                                 rates |= BIT(j);
1286         }
1287         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1288                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1289                 if (mode->mode == MODE_ATHEROS_TURBO)
1290                         rate *= 2;
1291                 for (j = 0; j < mode->num_rates; j++)
1292                         if (mode->rates[j].rate == rate)
1293                                 rates |= BIT(j);
1294         }
1295         sta->supp_rates = rates;
1296
1297         rate_control_rate_init(sta, local);
1298
1299         if (elems.wmm_param && ifsta->wmm_enabled) {
1300                 sta->flags |= WLAN_STA_WME;
1301                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1302                                          elems.wmm_param_len);
1303         }
1304
1305
1306         sta_info_put(sta);
1307
1308         ieee80211_associated(dev, ifsta);
1309 }
1310
1311
1312 /* Caller must hold local->sta_bss_lock */
1313 static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
1314                                         struct ieee80211_sta_bss *bss)
1315 {
1316         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1317         bss->hnext = local->sta_bss_hash[STA_HASH(bss->bssid)];
1318         local->sta_bss_hash[STA_HASH(bss->bssid)] = bss;
1319 }
1320
1321
1322 /* Caller must hold local->sta_bss_lock */
1323 static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
1324                                         struct ieee80211_sta_bss *bss)
1325 {
1326         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1327         struct ieee80211_sta_bss *b, *prev = NULL;
1328         b = local->sta_bss_hash[STA_HASH(bss->bssid)];
1329         while (b) {
1330                 if (b == bss) {
1331                         if (!prev)
1332                                 local->sta_bss_hash[STA_HASH(bss->bssid)] =
1333                                         bss->hnext;
1334                         else
1335                                 prev->hnext = bss->hnext;
1336                         break;
1337                 }
1338                 prev = b;
1339                 b = b->hnext;
1340         }
1341 }
1342
1343
1344 static struct ieee80211_sta_bss *
1345 ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid)
1346 {
1347         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1348         struct ieee80211_sta_bss *bss;
1349
1350         bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
1351         if (!bss)
1352                 return NULL;
1353         atomic_inc(&bss->users);
1354         atomic_inc(&bss->users);
1355         memcpy(bss->bssid, bssid, ETH_ALEN);
1356
1357         spin_lock_bh(&local->sta_bss_lock);
1358         /* TODO: order by RSSI? */
1359         list_add_tail(&bss->list, &local->sta_bss_list);
1360         __ieee80211_rx_bss_hash_add(dev, bss);
1361         spin_unlock_bh(&local->sta_bss_lock);
1362         return bss;
1363 }
1364
1365
1366 static struct ieee80211_sta_bss *
1367 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid)
1368 {
1369         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1370         struct ieee80211_sta_bss *bss;
1371
1372         spin_lock_bh(&local->sta_bss_lock);
1373         bss = local->sta_bss_hash[STA_HASH(bssid)];
1374         while (bss) {
1375                 if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0) {
1376                         atomic_inc(&bss->users);
1377                         break;
1378                 }
1379                 bss = bss->hnext;
1380         }
1381         spin_unlock_bh(&local->sta_bss_lock);
1382         return bss;
1383 }
1384
1385
1386 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
1387 {
1388         kfree(bss->wpa_ie);
1389         kfree(bss->rsn_ie);
1390         kfree(bss->wmm_ie);
1391         kfree(bss);
1392 }
1393
1394
1395 static void ieee80211_rx_bss_put(struct net_device *dev,
1396                                  struct ieee80211_sta_bss *bss)
1397 {
1398         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1399         if (!atomic_dec_and_test(&bss->users))
1400                 return;
1401
1402         spin_lock_bh(&local->sta_bss_lock);
1403         __ieee80211_rx_bss_hash_del(dev, bss);
1404         list_del(&bss->list);
1405         spin_unlock_bh(&local->sta_bss_lock);
1406         ieee80211_rx_bss_free(bss);
1407 }
1408
1409
1410 void ieee80211_rx_bss_list_init(struct net_device *dev)
1411 {
1412         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1413         spin_lock_init(&local->sta_bss_lock);
1414         INIT_LIST_HEAD(&local->sta_bss_list);
1415 }
1416
1417
1418 void ieee80211_rx_bss_list_deinit(struct net_device *dev)
1419 {
1420         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1421         struct ieee80211_sta_bss *bss, *tmp;
1422
1423         list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
1424                 ieee80211_rx_bss_put(dev, bss);
1425 }
1426
1427
1428 static void ieee80211_rx_bss_info(struct net_device *dev,
1429                                   struct ieee80211_mgmt *mgmt,
1430                                   size_t len,
1431                                   struct ieee80211_rx_status *rx_status,
1432                                   int beacon)
1433 {
1434         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1435         struct ieee802_11_elems elems;
1436         size_t baselen;
1437         int channel, invalid = 0, clen;
1438         struct ieee80211_sta_bss *bss;
1439         struct sta_info *sta;
1440         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1441         u64 timestamp;
1442
1443         if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
1444                 return; /* ignore ProbeResp to foreign address */
1445
1446 #if 0
1447         printk(KERN_DEBUG "%s: RX %s from " MAC_FMT " to " MAC_FMT "\n",
1448                dev->name, beacon ? "Beacon" : "Probe Response",
1449                MAC_ARG(mgmt->sa), MAC_ARG(mgmt->da));
1450 #endif
1451
1452         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1453         if (baselen > len)
1454                 return;
1455
1456         timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1457
1458         if (sdata->type == IEEE80211_IF_TYPE_IBSS && beacon &&
1459             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1460 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1461                 static unsigned long last_tsf_debug = 0;
1462                 u64 tsf;
1463                 if (local->ops->get_tsf)
1464                         tsf = local->ops->get_tsf(local_to_hw(local));
1465                 else
1466                         tsf = -1LLU;
1467                 if (time_after(jiffies, last_tsf_debug + 5 * HZ)) {
1468                         printk(KERN_DEBUG "RX beacon SA=" MAC_FMT " BSSID="
1469                                MAC_FMT " TSF=0x%llx BCN=0x%llx diff=%lld "
1470                                "@%lu\n",
1471                                MAC_ARG(mgmt->sa), MAC_ARG(mgmt->bssid),
1472                                (unsigned long long)tsf,
1473                                (unsigned long long)timestamp,
1474                                (unsigned long long)(tsf - timestamp),
1475                                jiffies);
1476                         last_tsf_debug = jiffies;
1477                 }
1478 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1479         }
1480
1481         if (ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen,
1482                                    &elems) == ParseFailed)
1483                 invalid = 1;
1484
1485         if (sdata->type == IEEE80211_IF_TYPE_IBSS && elems.supp_rates &&
1486             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
1487             (sta = sta_info_get(local, mgmt->sa))) {
1488                 struct ieee80211_hw_mode *mode;
1489                 struct ieee80211_rate *rates;
1490                 size_t num_rates;
1491                 u32 supp_rates, prev_rates;
1492                 int i, j;
1493
1494                 mode = local->sta_scanning ?
1495                        local->scan_hw_mode : local->oper_hw_mode;
1496                 rates = mode->rates;
1497                 num_rates = mode->num_rates;
1498
1499                 supp_rates = 0;
1500                 for (i = 0; i < elems.supp_rates_len +
1501                              elems.ext_supp_rates_len; i++) {
1502                         u8 rate = 0;
1503                         int own_rate;
1504                         if (i < elems.supp_rates_len)
1505                                 rate = elems.supp_rates[i];
1506                         else if (elems.ext_supp_rates)
1507                                 rate = elems.ext_supp_rates
1508                                         [i - elems.supp_rates_len];
1509                         own_rate = 5 * (rate & 0x7f);
1510                         if (mode->mode == MODE_ATHEROS_TURBO)
1511                                 own_rate *= 2;
1512                         for (j = 0; j < num_rates; j++)
1513                                 if (rates[j].rate == own_rate)
1514                                         supp_rates |= BIT(j);
1515                 }
1516
1517                 prev_rates = sta->supp_rates;
1518                 sta->supp_rates &= supp_rates;
1519                 if (sta->supp_rates == 0) {
1520                         /* No matching rates - this should not really happen.
1521                          * Make sure that at least one rate is marked
1522                          * supported to avoid issues with TX rate ctrl. */
1523                         sta->supp_rates = sdata->u.sta.supp_rates_bits;
1524                 }
1525                 if (sta->supp_rates != prev_rates) {
1526                         printk(KERN_DEBUG "%s: updated supp_rates set for "
1527                                MAC_FMT " based on beacon info (0x%x & 0x%x -> "
1528                                "0x%x)\n",
1529                                dev->name, MAC_ARG(sta->addr), prev_rates,
1530                                supp_rates, sta->supp_rates);
1531                 }
1532                 sta_info_put(sta);
1533         }
1534
1535         if (!elems.ssid)
1536                 return;
1537
1538         if (elems.ds_params && elems.ds_params_len == 1)
1539                 channel = elems.ds_params[0];
1540         else
1541                 channel = rx_status->channel;
1542
1543         bss = ieee80211_rx_bss_get(dev, mgmt->bssid);
1544         if (!bss) {
1545                 bss = ieee80211_rx_bss_add(dev, mgmt->bssid);
1546                 if (!bss)
1547                         return;
1548         } else {
1549 #if 0
1550                 /* TODO: order by RSSI? */
1551                 spin_lock_bh(&local->sta_bss_lock);
1552                 list_move_tail(&bss->list, &local->sta_bss_list);
1553                 spin_unlock_bh(&local->sta_bss_lock);
1554 #endif
1555         }
1556
1557         if (bss->probe_resp && beacon) {
1558                 /* Do not allow beacon to override data from Probe Response. */
1559                 ieee80211_rx_bss_put(dev, bss);
1560                 return;
1561         }
1562
1563         /* save the ERP value so that it is available at association time */
1564         if (elems.erp_info && elems.erp_info_len >= 1) {
1565                 bss->erp_value = elems.erp_info[0];
1566                 bss->has_erp_value = 1;
1567         }
1568
1569         bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
1570         bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
1571         if (elems.ssid && elems.ssid_len <= IEEE80211_MAX_SSID_LEN) {
1572                 memcpy(bss->ssid, elems.ssid, elems.ssid_len);
1573                 bss->ssid_len = elems.ssid_len;
1574         }
1575
1576         bss->supp_rates_len = 0;
1577         if (elems.supp_rates) {
1578                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1579                 if (clen > elems.supp_rates_len)
1580                         clen = elems.supp_rates_len;
1581                 memcpy(&bss->supp_rates[bss->supp_rates_len], elems.supp_rates,
1582                        clen);
1583                 bss->supp_rates_len += clen;
1584         }
1585         if (elems.ext_supp_rates) {
1586                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1587                 if (clen > elems.ext_supp_rates_len)
1588                         clen = elems.ext_supp_rates_len;
1589                 memcpy(&bss->supp_rates[bss->supp_rates_len],
1590                        elems.ext_supp_rates, clen);
1591                 bss->supp_rates_len += clen;
1592         }
1593
1594         if (elems.wpa &&
1595             (!bss->wpa_ie || bss->wpa_ie_len != elems.wpa_len ||
1596              memcmp(bss->wpa_ie, elems.wpa, elems.wpa_len))) {
1597                 kfree(bss->wpa_ie);
1598                 bss->wpa_ie = kmalloc(elems.wpa_len + 2, GFP_ATOMIC);
1599                 if (bss->wpa_ie) {
1600                         memcpy(bss->wpa_ie, elems.wpa - 2, elems.wpa_len + 2);
1601                         bss->wpa_ie_len = elems.wpa_len + 2;
1602                 } else
1603                         bss->wpa_ie_len = 0;
1604         } else if (!elems.wpa && bss->wpa_ie) {
1605                 kfree(bss->wpa_ie);
1606                 bss->wpa_ie = NULL;
1607                 bss->wpa_ie_len = 0;
1608         }
1609
1610         if (elems.rsn &&
1611             (!bss->rsn_ie || bss->rsn_ie_len != elems.rsn_len ||
1612              memcmp(bss->rsn_ie, elems.rsn, elems.rsn_len))) {
1613                 kfree(bss->rsn_ie);
1614                 bss->rsn_ie = kmalloc(elems.rsn_len + 2, GFP_ATOMIC);
1615                 if (bss->rsn_ie) {
1616                         memcpy(bss->rsn_ie, elems.rsn - 2, elems.rsn_len + 2);
1617                         bss->rsn_ie_len = elems.rsn_len + 2;
1618                 } else
1619                         bss->rsn_ie_len = 0;
1620         } else if (!elems.rsn && bss->rsn_ie) {
1621                 kfree(bss->rsn_ie);
1622                 bss->rsn_ie = NULL;
1623                 bss->rsn_ie_len = 0;
1624         }
1625
1626         if (elems.wmm_param &&
1627             (!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_param_len ||
1628              memcmp(bss->wmm_ie, elems.wmm_param, elems.wmm_param_len))) {
1629                 kfree(bss->wmm_ie);
1630                 bss->wmm_ie = kmalloc(elems.wmm_param_len + 2, GFP_ATOMIC);
1631                 if (bss->wmm_ie) {
1632                         memcpy(bss->wmm_ie, elems.wmm_param - 2,
1633                                elems.wmm_param_len + 2);
1634                         bss->wmm_ie_len = elems.wmm_param_len + 2;
1635                 } else
1636                         bss->wmm_ie_len = 0;
1637         } else if (!elems.wmm_param && bss->wmm_ie) {
1638                 kfree(bss->wmm_ie);
1639                 bss->wmm_ie = NULL;
1640                 bss->wmm_ie_len = 0;
1641         }
1642
1643
1644         bss->hw_mode = rx_status->phymode;
1645         bss->channel = channel;
1646         bss->freq = rx_status->freq;
1647         if (channel != rx_status->channel &&
1648             (bss->hw_mode == MODE_IEEE80211G ||
1649              bss->hw_mode == MODE_IEEE80211B) &&
1650             channel >= 1 && channel <= 14) {
1651                 static const int freq_list[] = {
1652                         2412, 2417, 2422, 2427, 2432, 2437, 2442,
1653                         2447, 2452, 2457, 2462, 2467, 2472, 2484
1654                 };
1655                 /* IEEE 802.11g/b mode can receive packets from neighboring
1656                  * channels, so map the channel into frequency. */
1657                 bss->freq = freq_list[channel - 1];
1658         }
1659         bss->timestamp = timestamp;
1660         bss->last_update = jiffies;
1661         bss->rssi = rx_status->ssi;
1662         bss->signal = rx_status->signal;
1663         bss->noise = rx_status->noise;
1664         if (!beacon)
1665                 bss->probe_resp++;
1666         ieee80211_rx_bss_put(dev, bss);
1667 }
1668
1669
1670 static void ieee80211_rx_mgmt_probe_resp(struct net_device *dev,
1671                                          struct ieee80211_mgmt *mgmt,
1672                                          size_t len,
1673                                          struct ieee80211_rx_status *rx_status)
1674 {
1675         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 0);
1676 }
1677
1678
1679 static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
1680                                      struct ieee80211_mgmt *mgmt,
1681                                      size_t len,
1682                                      struct ieee80211_rx_status *rx_status)
1683 {
1684         struct ieee80211_sub_if_data *sdata;
1685         struct ieee80211_if_sta *ifsta;
1686         size_t baselen;
1687         struct ieee802_11_elems elems;
1688
1689         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 1);
1690
1691         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1692         if (sdata->type != IEEE80211_IF_TYPE_STA)
1693                 return;
1694         ifsta = &sdata->u.sta;
1695
1696         if (!ifsta->associated ||
1697             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1698                 return;
1699
1700         /* Process beacon from the current BSS */
1701         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1702         if (baselen > len)
1703                 return;
1704
1705         if (ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen,
1706                                    &elems) == ParseFailed)
1707                 return;
1708
1709         if (elems.erp_info && elems.erp_info_len >= 1)
1710                 ieee80211_handle_erp_ie(dev, elems.erp_info[0]);
1711
1712         if (elems.wmm_param && ifsta->wmm_enabled) {
1713                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1714                                          elems.wmm_param_len);
1715         }
1716 }
1717
1718
1719 static void ieee80211_rx_mgmt_probe_req(struct net_device *dev,
1720                                         struct ieee80211_if_sta *ifsta,
1721                                         struct ieee80211_mgmt *mgmt,
1722                                         size_t len,
1723                                         struct ieee80211_rx_status *rx_status)
1724 {
1725         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1726         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1727         int tx_last_beacon;
1728         struct sk_buff *skb;
1729         struct ieee80211_mgmt *resp;
1730         u8 *pos, *end;
1731
1732         if (sdata->type != IEEE80211_IF_TYPE_IBSS ||
1733             ifsta->state != IEEE80211_IBSS_JOINED ||
1734             len < 24 + 2 || !ifsta->probe_resp)
1735                 return;
1736
1737         if (local->ops->tx_last_beacon)
1738                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1739         else
1740                 tx_last_beacon = 1;
1741
1742 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1743         printk(KERN_DEBUG "%s: RX ProbeReq SA=" MAC_FMT " DA=" MAC_FMT " BSSID="
1744                MAC_FMT " (tx_last_beacon=%d)\n",
1745                dev->name, MAC_ARG(mgmt->sa), MAC_ARG(mgmt->da),
1746                MAC_ARG(mgmt->bssid), tx_last_beacon);
1747 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1748
1749         if (!tx_last_beacon)
1750                 return;
1751
1752         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1753             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1754                 return;
1755
1756         end = ((u8 *) mgmt) + len;
1757         pos = mgmt->u.probe_req.variable;
1758         if (pos[0] != WLAN_EID_SSID ||
1759             pos + 2 + pos[1] > end) {
1760                 if (net_ratelimit()) {
1761                         printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1762                                "from " MAC_FMT "\n",
1763                                dev->name, MAC_ARG(mgmt->sa));
1764                 }
1765                 return;
1766         }
1767         if (pos[1] != 0 &&
1768             (pos[1] != ifsta->ssid_len ||
1769              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1770                 /* Ignore ProbeReq for foreign SSID */
1771                 return;
1772         }
1773
1774         /* Reply with ProbeResp */
1775         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1776         if (!skb)
1777                 return;
1778
1779         resp = (struct ieee80211_mgmt *) skb->data;
1780         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1781 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1782         printk(KERN_DEBUG "%s: Sending ProbeResp to " MAC_FMT "\n",
1783                dev->name, MAC_ARG(resp->da));
1784 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1785         ieee80211_sta_tx(dev, skb, 0);
1786 }
1787
1788
1789 void ieee80211_sta_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
1790                            struct ieee80211_rx_status *rx_status)
1791 {
1792         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1793         struct ieee80211_sub_if_data *sdata;
1794         struct ieee80211_if_sta *ifsta;
1795         struct ieee80211_mgmt *mgmt;
1796         u16 fc;
1797
1798         if (skb->len < 24)
1799                 goto fail;
1800
1801         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1802         ifsta = &sdata->u.sta;
1803
1804         mgmt = (struct ieee80211_mgmt *) skb->data;
1805         fc = le16_to_cpu(mgmt->frame_control);
1806
1807         switch (fc & IEEE80211_FCTL_STYPE) {
1808         case IEEE80211_STYPE_PROBE_REQ:
1809         case IEEE80211_STYPE_PROBE_RESP:
1810         case IEEE80211_STYPE_BEACON:
1811                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1812         case IEEE80211_STYPE_AUTH:
1813         case IEEE80211_STYPE_ASSOC_RESP:
1814         case IEEE80211_STYPE_REASSOC_RESP:
1815         case IEEE80211_STYPE_DEAUTH:
1816         case IEEE80211_STYPE_DISASSOC:
1817                 skb_queue_tail(&ifsta->skb_queue, skb);
1818                 queue_work(local->hw.workqueue, &ifsta->work);
1819                 return;
1820         default:
1821                 printk(KERN_DEBUG "%s: received unknown management frame - "
1822                        "stype=%d\n", dev->name,
1823                        (fc & IEEE80211_FCTL_STYPE) >> 4);
1824                 break;
1825         }
1826
1827  fail:
1828         kfree_skb(skb);
1829 }
1830
1831
1832 static void ieee80211_sta_rx_queued_mgmt(struct net_device *dev,
1833                                          struct sk_buff *skb)
1834 {
1835         struct ieee80211_rx_status *rx_status;
1836         struct ieee80211_sub_if_data *sdata;
1837         struct ieee80211_if_sta *ifsta;
1838         struct ieee80211_mgmt *mgmt;
1839         u16 fc;
1840
1841         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1842         ifsta = &sdata->u.sta;
1843
1844         rx_status = (struct ieee80211_rx_status *) skb->cb;
1845         mgmt = (struct ieee80211_mgmt *) skb->data;
1846         fc = le16_to_cpu(mgmt->frame_control);
1847
1848         switch (fc & IEEE80211_FCTL_STYPE) {
1849         case IEEE80211_STYPE_PROBE_REQ:
1850                 ieee80211_rx_mgmt_probe_req(dev, ifsta, mgmt, skb->len,
1851                                             rx_status);
1852                 break;
1853         case IEEE80211_STYPE_PROBE_RESP:
1854                 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
1855                 break;
1856         case IEEE80211_STYPE_BEACON:
1857                 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
1858                 break;
1859         case IEEE80211_STYPE_AUTH:
1860                 ieee80211_rx_mgmt_auth(dev, ifsta, mgmt, skb->len);
1861                 break;
1862         case IEEE80211_STYPE_ASSOC_RESP:
1863                 ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len, 0);
1864                 break;
1865         case IEEE80211_STYPE_REASSOC_RESP:
1866                 ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len, 1);
1867                 break;
1868         case IEEE80211_STYPE_DEAUTH:
1869                 ieee80211_rx_mgmt_deauth(dev, ifsta, mgmt, skb->len);
1870                 break;
1871         case IEEE80211_STYPE_DISASSOC:
1872                 ieee80211_rx_mgmt_disassoc(dev, ifsta, mgmt, skb->len);
1873                 break;
1874         }
1875
1876         kfree_skb(skb);
1877 }
1878
1879
1880 void ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
1881                            struct ieee80211_rx_status *rx_status)
1882 {
1883         struct ieee80211_mgmt *mgmt;
1884         u16 fc;
1885
1886         if (skb->len < 24) {
1887                 dev_kfree_skb(skb);
1888                 return;
1889         }
1890
1891         mgmt = (struct ieee80211_mgmt *) skb->data;
1892         fc = le16_to_cpu(mgmt->frame_control);
1893
1894         if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) {
1895                 if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP) {
1896                         ieee80211_rx_mgmt_probe_resp(dev, mgmt,
1897                                                      skb->len, rx_status);
1898                 } else if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
1899                         ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len,
1900                                                  rx_status);
1901                 }
1902         }
1903
1904         dev_kfree_skb(skb);
1905 }
1906
1907
1908 static int ieee80211_sta_active_ibss(struct net_device *dev)
1909 {
1910         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1911         int active = 0;
1912         struct sta_info *sta;
1913
1914         read_lock_bh(&local->sta_lock);
1915         list_for_each_entry(sta, &local->sta_list, list) {
1916                 if (sta->dev == dev &&
1917                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1918                                jiffies)) {
1919                         active++;
1920                         break;
1921                 }
1922         }
1923         read_unlock_bh(&local->sta_lock);
1924
1925         return active;
1926 }
1927
1928
1929 static void ieee80211_sta_expire(struct net_device *dev)
1930 {
1931         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1932         struct sta_info *sta, *tmp;
1933         LIST_HEAD(tmp_list);
1934
1935         write_lock_bh(&local->sta_lock);
1936         list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
1937                 if (time_after(jiffies, sta->last_rx +
1938                                IEEE80211_IBSS_INACTIVITY_LIMIT)) {
1939                         printk(KERN_DEBUG "%s: expiring inactive STA " MAC_FMT
1940                                "\n", dev->name, MAC_ARG(sta->addr));
1941                         __sta_info_get(sta);
1942                         sta_info_remove(sta);
1943                         list_add(&sta->list, &tmp_list);
1944                 }
1945         write_unlock_bh(&local->sta_lock);
1946
1947         list_for_each_entry_safe(sta, tmp, &tmp_list, list) {
1948                 sta_info_free(sta);
1949                 sta_info_put(sta);
1950         }
1951 }
1952
1953
1954 static void ieee80211_sta_merge_ibss(struct net_device *dev,
1955                                      struct ieee80211_if_sta *ifsta)
1956 {
1957         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1958
1959         ieee80211_sta_expire(dev);
1960         if (ieee80211_sta_active_ibss(dev))
1961                 return;
1962
1963         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1964                "IBSS networks with same SSID (merge)\n", dev->name);
1965         ieee80211_sta_req_scan(dev, ifsta->ssid, ifsta->ssid_len);
1966 }
1967
1968
1969 void ieee80211_sta_timer(unsigned long data)
1970 {
1971         struct ieee80211_sub_if_data *sdata =
1972                 (struct ieee80211_sub_if_data *) data;
1973         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1974         struct ieee80211_local *local = wdev_priv(&sdata->wdev);
1975
1976         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1977         queue_work(local->hw.workqueue, &ifsta->work);
1978 }
1979
1980
1981 void ieee80211_sta_work(struct work_struct *work)
1982 {
1983         struct ieee80211_sub_if_data *sdata =
1984                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
1985         struct net_device *dev = sdata->dev;
1986         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1987         struct ieee80211_if_sta *ifsta;
1988         struct sk_buff *skb;
1989
1990         if (!netif_running(dev))
1991                 return;
1992
1993         if (local->sta_scanning)
1994                 return;
1995
1996         if (sdata->type != IEEE80211_IF_TYPE_STA &&
1997             sdata->type != IEEE80211_IF_TYPE_IBSS) {
1998                 printk(KERN_DEBUG "%s: ieee80211_sta_work: non-STA interface "
1999                        "(type=%d)\n", dev->name, sdata->type);
2000                 return;
2001         }
2002         ifsta = &sdata->u.sta;
2003
2004         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2005                 ieee80211_sta_rx_queued_mgmt(dev, skb);
2006
2007         if (ifsta->state != IEEE80211_AUTHENTICATE &&
2008             ifsta->state != IEEE80211_ASSOCIATE &&
2009             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2010                 ieee80211_sta_start_scan(dev, NULL, 0);
2011                 return;
2012         }
2013
2014         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2015                 if (ieee80211_sta_config_auth(dev, ifsta))
2016                         return;
2017                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2018         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2019                 return;
2020
2021         switch (ifsta->state) {
2022         case IEEE80211_DISABLED:
2023                 break;
2024         case IEEE80211_AUTHENTICATE:
2025                 ieee80211_authenticate(dev, ifsta);
2026                 break;
2027         case IEEE80211_ASSOCIATE:
2028                 ieee80211_associate(dev, ifsta);
2029                 break;
2030         case IEEE80211_ASSOCIATED:
2031                 ieee80211_associated(dev, ifsta);
2032                 break;
2033         case IEEE80211_IBSS_SEARCH:
2034                 ieee80211_sta_find_ibss(dev, ifsta);
2035                 break;
2036         case IEEE80211_IBSS_JOINED:
2037                 ieee80211_sta_merge_ibss(dev, ifsta);
2038                 break;
2039         default:
2040                 printk(KERN_DEBUG "ieee80211_sta_work: Unknown state %d\n",
2041                        ifsta->state);
2042                 break;
2043         }
2044
2045         if (ieee80211_privacy_mismatch(dev, ifsta)) {
2046                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2047                        "mixed-cell disabled - disassociate\n", dev->name);
2048
2049                 ieee80211_send_disassoc(dev, ifsta, WLAN_REASON_UNSPECIFIED);
2050                 ieee80211_set_disassoc(dev, ifsta, 0);
2051         }
2052 }
2053
2054
2055 static void ieee80211_sta_reset_auth(struct net_device *dev,
2056                                      struct ieee80211_if_sta *ifsta)
2057 {
2058         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2059
2060         if (local->ops->reset_tsf) {
2061                 /* Reset own TSF to allow time synchronization work. */
2062                 local->ops->reset_tsf(local_to_hw(local));
2063         }
2064
2065         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2066
2067
2068         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2069                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2070         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2071                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2072         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2073                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2074         else
2075                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2076         printk(KERN_DEBUG "%s: Initial auth_alg=%d\n", dev->name,
2077                ifsta->auth_alg);
2078         ifsta->auth_transaction = -1;
2079         ifsta->associated = ifsta->auth_tries = ifsta->assoc_tries = 0;
2080         netif_carrier_off(dev);
2081 }
2082
2083
2084 void ieee80211_sta_req_auth(struct net_device *dev,
2085                             struct ieee80211_if_sta *ifsta)
2086 {
2087         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2088         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2089
2090         if (sdata->type != IEEE80211_IF_TYPE_STA)
2091                 return;
2092
2093         if ((ifsta->bssid_set || ifsta->auto_bssid_sel) &&
2094             (ifsta->ssid_set || ifsta->auto_ssid_sel)) {
2095                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2096                 queue_work(local->hw.workqueue, &ifsta->work);
2097         }
2098 }
2099
2100 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2101                                     const char *ssid, int ssid_len)
2102 {
2103         int tmp, hidden_ssid;
2104
2105         if (!memcmp(ifsta->ssid, ssid, ssid_len))
2106                 return 1;
2107
2108         if (ifsta->auto_bssid_sel)
2109                 return 0;
2110
2111         hidden_ssid = 1;
2112         tmp = ssid_len;
2113         while (tmp--) {
2114                 if (ssid[tmp] != '\0') {
2115                         hidden_ssid = 0;
2116                         break;
2117                 }
2118         }
2119
2120         if (hidden_ssid && ifsta->ssid_len == ssid_len)
2121                 return 1;
2122
2123         if (ssid_len == 1 && ssid[0] == ' ')
2124                 return 1;
2125
2126         return 0;
2127 }
2128
2129 static int ieee80211_sta_config_auth(struct net_device *dev,
2130                                      struct ieee80211_if_sta *ifsta)
2131 {
2132         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2133         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2134         struct ieee80211_sta_bss *bss, *selected = NULL;
2135         int top_rssi = 0, freq;
2136
2137         if (!ifsta->auto_channel_sel && !ifsta->auto_bssid_sel &&
2138             !ifsta->auto_ssid_sel) {
2139                 ifsta->state = IEEE80211_AUTHENTICATE;
2140                 ieee80211_sta_reset_auth(dev, ifsta);
2141                 return 0;
2142         }
2143
2144         spin_lock_bh(&local->sta_bss_lock);
2145         freq = local->oper_channel->freq;
2146         list_for_each_entry(bss, &local->sta_bss_list, list) {
2147                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2148                         continue;
2149
2150                 if (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2151                     !!sdata->default_key)
2152                         continue;
2153
2154                 if (!ifsta->auto_channel_sel && bss->freq != freq)
2155                         continue;
2156
2157                 if (!ifsta->auto_bssid_sel &&
2158                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2159                         continue;
2160
2161                 if (!ifsta->auto_ssid_sel &&
2162                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2163                         continue;
2164
2165                 if (!selected || top_rssi < bss->rssi) {
2166                         selected = bss;
2167                         top_rssi = bss->rssi;
2168                 }
2169         }
2170         if (selected)
2171                 atomic_inc(&selected->users);
2172         spin_unlock_bh(&local->sta_bss_lock);
2173
2174         if (selected) {
2175                 ieee80211_set_channel(local, -1, selected->freq);
2176                 if (!ifsta->ssid_set)
2177                         ieee80211_sta_set_ssid(dev, selected->ssid,
2178                                                selected->ssid_len);
2179                 ieee80211_sta_set_bssid(dev, selected->bssid);
2180                 ieee80211_rx_bss_put(dev, selected);
2181                 ifsta->state = IEEE80211_AUTHENTICATE;
2182                 ieee80211_sta_reset_auth(dev, ifsta);
2183                 return 0;
2184         } else {
2185                 if (ifsta->state != IEEE80211_AUTHENTICATE) {
2186                         if (ifsta->auto_ssid_sel)
2187                                 ieee80211_sta_start_scan(dev, NULL, 0);
2188                         else
2189                                 ieee80211_sta_start_scan(dev, ifsta->ssid,
2190                                                          ifsta->ssid_len);
2191                         ifsta->state = IEEE80211_AUTHENTICATE;
2192                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2193                 } else
2194                         ifsta->state = IEEE80211_DISABLED;
2195         }
2196         return -1;
2197 }
2198
2199 static int ieee80211_sta_join_ibss(struct net_device *dev,
2200                                    struct ieee80211_if_sta *ifsta,
2201                                    struct ieee80211_sta_bss *bss)
2202 {
2203         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2204         int res, rates, i, j;
2205         struct sk_buff *skb;
2206         struct ieee80211_mgmt *mgmt;
2207         struct ieee80211_tx_control control;
2208         struct ieee80211_rate *rate;
2209         struct ieee80211_hw_mode *mode;
2210         struct rate_control_extra extra;
2211         u8 *pos;
2212         struct ieee80211_sub_if_data *sdata;
2213
2214         /* Remove possible STA entries from other IBSS networks. */
2215         sta_info_flush(local, NULL);
2216
2217         if (local->ops->reset_tsf) {
2218                 /* Reset own TSF to allow time synchronization work. */
2219                 local->ops->reset_tsf(local_to_hw(local));
2220         }
2221         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2222         res = ieee80211_if_config(dev);
2223         if (res)
2224                 return res;
2225
2226         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2227
2228         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2229         sdata->drop_unencrypted = bss->capability &
2230                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2231
2232         res = ieee80211_set_channel(local, -1, bss->freq);
2233
2234         if (!(local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)) {
2235                 printk(KERN_DEBUG "%s: IBSS not allowed on channel %d "
2236                        "(%d MHz)\n", dev->name, local->hw.conf.channel,
2237                        local->hw.conf.freq);
2238                 return -1;
2239         }
2240
2241         /* Set beacon template based on scan results */
2242         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2243         do {
2244                 if (!skb)
2245                         break;
2246
2247                 skb_reserve(skb, local->hw.extra_tx_headroom);
2248
2249                 mgmt = (struct ieee80211_mgmt *)
2250                         skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2251                 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2252                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2253                                                    IEEE80211_STYPE_BEACON);
2254                 memset(mgmt->da, 0xff, ETH_ALEN);
2255                 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
2256                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2257                 mgmt->u.beacon.beacon_int =
2258                         cpu_to_le16(local->hw.conf.beacon_int);
2259                 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2260
2261                 pos = skb_put(skb, 2 + ifsta->ssid_len);
2262                 *pos++ = WLAN_EID_SSID;
2263                 *pos++ = ifsta->ssid_len;
2264                 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2265
2266                 rates = bss->supp_rates_len;
2267                 if (rates > 8)
2268                         rates = 8;
2269                 pos = skb_put(skb, 2 + rates);
2270                 *pos++ = WLAN_EID_SUPP_RATES;
2271                 *pos++ = rates;
2272                 memcpy(pos, bss->supp_rates, rates);
2273
2274                 pos = skb_put(skb, 2 + 1);
2275                 *pos++ = WLAN_EID_DS_PARAMS;
2276                 *pos++ = 1;
2277                 *pos++ = bss->channel;
2278
2279                 pos = skb_put(skb, 2 + 2);
2280                 *pos++ = WLAN_EID_IBSS_PARAMS;
2281                 *pos++ = 2;
2282                 /* FIX: set ATIM window based on scan results */
2283                 *pos++ = 0;
2284                 *pos++ = 0;
2285
2286                 if (bss->supp_rates_len > 8) {
2287                         rates = bss->supp_rates_len - 8;
2288                         pos = skb_put(skb, 2 + rates);
2289                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
2290                         *pos++ = rates;
2291                         memcpy(pos, &bss->supp_rates[8], rates);
2292                 }
2293
2294                 memset(&control, 0, sizeof(control));
2295                 memset(&extra, 0, sizeof(extra));
2296                 extra.mode = local->oper_hw_mode;
2297                 rate = rate_control_get_rate(local, dev, skb, &extra);
2298                 if (!rate) {
2299                         printk(KERN_DEBUG "%s: Failed to determine TX rate "
2300                                "for IBSS beacon\n", dev->name);
2301                         break;
2302                 }
2303                 control.tx_rate = (sdata->short_preamble &&
2304                                    (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
2305                         rate->val2 : rate->val;
2306                 control.antenna_sel_tx = local->hw.conf.antenna_sel_tx;
2307                 control.power_level = local->hw.conf.power_level;
2308                 control.flags |= IEEE80211_TXCTL_NO_ACK;
2309                 control.retry_limit = 1;
2310
2311                 ifsta->probe_resp = skb_copy(skb, GFP_ATOMIC);
2312                 if (ifsta->probe_resp) {
2313                         mgmt = (struct ieee80211_mgmt *)
2314                                 ifsta->probe_resp->data;
2315                         mgmt->frame_control =
2316                                 IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2317                                              IEEE80211_STYPE_PROBE_RESP);
2318                 } else {
2319                         printk(KERN_DEBUG "%s: Could not allocate ProbeResp "
2320                                "template for IBSS\n", dev->name);
2321                 }
2322
2323                 if (local->ops->beacon_update &&
2324                     local->ops->beacon_update(local_to_hw(local),
2325                                              skb, &control) == 0) {
2326                         printk(KERN_DEBUG "%s: Configured IBSS beacon "
2327                                "template based on scan results\n", dev->name);
2328                         skb = NULL;
2329                 }
2330
2331                 rates = 0;
2332                 mode = local->oper_hw_mode;
2333                 for (i = 0; i < bss->supp_rates_len; i++) {
2334                         int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2335                         if (mode->mode == MODE_ATHEROS_TURBO)
2336                                 bitrate *= 2;
2337                         for (j = 0; j < mode->num_rates; j++)
2338                                 if (mode->rates[j].rate == bitrate)
2339                                         rates |= BIT(j);
2340                 }
2341                 ifsta->supp_rates_bits = rates;
2342         } while (0);
2343
2344         if (skb) {
2345                 printk(KERN_DEBUG "%s: Failed to configure IBSS beacon "
2346                        "template\n", dev->name);
2347                 dev_kfree_skb(skb);
2348         }
2349
2350         ifsta->state = IEEE80211_IBSS_JOINED;
2351         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2352
2353         ieee80211_rx_bss_put(dev, bss);
2354
2355         return res;
2356 }
2357
2358
2359 static int ieee80211_sta_create_ibss(struct net_device *dev,
2360                                      struct ieee80211_if_sta *ifsta)
2361 {
2362         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2363         struct ieee80211_sta_bss *bss;
2364         struct ieee80211_sub_if_data *sdata;
2365         struct ieee80211_hw_mode *mode;
2366         u8 bssid[ETH_ALEN], *pos;
2367         int i;
2368
2369 #if 0
2370         /* Easier testing, use fixed BSSID. */
2371         memset(bssid, 0xfe, ETH_ALEN);
2372 #else
2373         /* Generate random, not broadcast, locally administered BSSID. Mix in
2374          * own MAC address to make sure that devices that do not have proper
2375          * random number generator get different BSSID. */
2376         get_random_bytes(bssid, ETH_ALEN);
2377         for (i = 0; i < ETH_ALEN; i++)
2378                 bssid[i] ^= dev->dev_addr[i];
2379         bssid[0] &= ~0x01;
2380         bssid[0] |= 0x02;
2381 #endif
2382
2383         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID " MAC_FMT "\n",
2384                dev->name, MAC_ARG(bssid));
2385
2386         bss = ieee80211_rx_bss_add(dev, bssid);
2387         if (!bss)
2388                 return -ENOMEM;
2389
2390         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2391         mode = local->oper_hw_mode;
2392
2393         if (local->hw.conf.beacon_int == 0)
2394                 local->hw.conf.beacon_int = 100;
2395         bss->beacon_int = local->hw.conf.beacon_int;
2396         bss->hw_mode = local->hw.conf.phymode;
2397         bss->channel = local->hw.conf.channel;
2398         bss->freq = local->hw.conf.freq;
2399         bss->last_update = jiffies;
2400         bss->capability = WLAN_CAPABILITY_IBSS;
2401         if (sdata->default_key) {
2402                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2403         } else
2404                 sdata->drop_unencrypted = 0;
2405         bss->supp_rates_len = mode->num_rates;
2406         pos = bss->supp_rates;
2407         for (i = 0; i < mode->num_rates; i++) {
2408                 int rate = mode->rates[i].rate;
2409                 if (mode->mode == MODE_ATHEROS_TURBO)
2410                         rate /= 2;
2411                 *pos++ = (u8) (rate / 5);
2412         }
2413
2414         return ieee80211_sta_join_ibss(dev, ifsta, bss);
2415 }
2416
2417
2418 static int ieee80211_sta_find_ibss(struct net_device *dev,
2419                                    struct ieee80211_if_sta *ifsta)
2420 {
2421         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2422         struct ieee80211_sta_bss *bss;
2423         int found = 0;
2424         u8 bssid[ETH_ALEN];
2425         int active_ibss;
2426
2427         if (ifsta->ssid_len == 0)
2428                 return -EINVAL;
2429
2430         active_ibss = ieee80211_sta_active_ibss(dev);
2431 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2432         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2433                dev->name, active_ibss);
2434 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2435         spin_lock_bh(&local->sta_bss_lock);
2436         list_for_each_entry(bss, &local->sta_bss_list, list) {
2437                 if (ifsta->ssid_len != bss->ssid_len ||
2438                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2439                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2440                         continue;
2441 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2442                 printk(KERN_DEBUG "   bssid=" MAC_FMT " found\n",
2443                        MAC_ARG(bss->bssid));
2444 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2445                 memcpy(bssid, bss->bssid, ETH_ALEN);
2446                 found = 1;
2447                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2448                         break;
2449         }
2450         spin_unlock_bh(&local->sta_bss_lock);
2451
2452 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2453         printk(KERN_DEBUG "   sta_find_ibss: selected " MAC_FMT " current "
2454                MAC_FMT "\n", MAC_ARG(bssid), MAC_ARG(ifsta->bssid));
2455 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2456         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
2457             (bss = ieee80211_rx_bss_get(dev, bssid))) {
2458                 printk(KERN_DEBUG "%s: Selected IBSS BSSID " MAC_FMT
2459                        " based on configured SSID\n",
2460                        dev->name, MAC_ARG(bssid));
2461                 return ieee80211_sta_join_ibss(dev, ifsta, bss);
2462         }
2463 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2464         printk(KERN_DEBUG "   did not try to join ibss\n");
2465 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2466
2467         /* Selected IBSS not found in current scan results - try to scan */
2468         if (ifsta->state == IEEE80211_IBSS_JOINED &&
2469             !ieee80211_sta_active_ibss(dev)) {
2470                 mod_timer(&ifsta->timer, jiffies +
2471                                       IEEE80211_IBSS_MERGE_INTERVAL);
2472         } else if (time_after(jiffies, local->last_scan_completed +
2473                               IEEE80211_SCAN_INTERVAL)) {
2474                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2475                        "join\n", dev->name);
2476                 return ieee80211_sta_req_scan(dev, ifsta->ssid,
2477                                               ifsta->ssid_len);
2478         } else if (ifsta->state != IEEE80211_IBSS_JOINED) {
2479                 int interval = IEEE80211_SCAN_INTERVAL;
2480
2481                 if (time_after(jiffies, ifsta->ibss_join_req +
2482                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2483                         if (ifsta->create_ibss &&
2484                             local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)
2485                                 return ieee80211_sta_create_ibss(dev, ifsta);
2486                         if (ifsta->create_ibss) {
2487                                 printk(KERN_DEBUG "%s: IBSS not allowed on the"
2488                                        " configured channel %d (%d MHz)\n",
2489                                        dev->name, local->hw.conf.channel,
2490                                        local->hw.conf.freq);
2491                         }
2492
2493                         /* No IBSS found - decrease scan interval and continue
2494                          * scanning. */
2495                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2496                 }
2497
2498                 ifsta->state = IEEE80211_IBSS_SEARCH;
2499                 mod_timer(&ifsta->timer, jiffies + interval);
2500                 return 0;
2501         }
2502
2503         return 0;
2504 }
2505
2506
2507 int ieee80211_sta_set_ssid(struct net_device *dev, char *ssid, size_t len)
2508 {
2509         struct ieee80211_sub_if_data *sdata;
2510         struct ieee80211_if_sta *ifsta;
2511         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2512
2513         if (len > IEEE80211_MAX_SSID_LEN)
2514                 return -EINVAL;
2515
2516         /* TODO: This should always be done for IBSS, even if IEEE80211_QOS is
2517          * not defined. */
2518         if (local->ops->conf_tx) {
2519                 struct ieee80211_tx_queue_params qparam;
2520                 int i;
2521
2522                 memset(&qparam, 0, sizeof(qparam));
2523                 /* TODO: are these ok defaults for all hw_modes? */
2524                 qparam.aifs = 2;
2525                 qparam.cw_min =
2526                         local->hw.conf.phymode == MODE_IEEE80211B ? 31 : 15;
2527                 qparam.cw_max = 1023;
2528                 qparam.burst_time = 0;
2529                 for (i = IEEE80211_TX_QUEUE_DATA0; i < NUM_TX_DATA_QUEUES; i++)
2530                 {
2531                         local->ops->conf_tx(local_to_hw(local),
2532                                            i + IEEE80211_TX_QUEUE_DATA0,
2533                                            &qparam);
2534                 }
2535                 /* IBSS uses different parameters for Beacon sending */
2536                 qparam.cw_min++;
2537                 qparam.cw_min *= 2;
2538                 qparam.cw_min--;
2539                 local->ops->conf_tx(local_to_hw(local),
2540                                    IEEE80211_TX_QUEUE_BEACON, &qparam);
2541         }
2542
2543         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2544         ifsta = &sdata->u.sta;
2545
2546         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0)
2547                 ifsta->prev_bssid_set = 0;
2548         memcpy(ifsta->ssid, ssid, len);
2549         memset(ifsta->ssid + len, 0, IEEE80211_MAX_SSID_LEN - len);
2550         ifsta->ssid_len = len;
2551
2552         ifsta->ssid_set = len ? 1 : 0;
2553         if (sdata->type == IEEE80211_IF_TYPE_IBSS && !ifsta->bssid_set) {
2554                 ifsta->ibss_join_req = jiffies;
2555                 ifsta->state = IEEE80211_IBSS_SEARCH;
2556                 return ieee80211_sta_find_ibss(dev, ifsta);
2557         }
2558         return 0;
2559 }
2560
2561
2562 int ieee80211_sta_get_ssid(struct net_device *dev, char *ssid, size_t *len)
2563 {
2564         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2565         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2566         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2567         *len = ifsta->ssid_len;
2568         return 0;
2569 }
2570
2571
2572 int ieee80211_sta_set_bssid(struct net_device *dev, u8 *bssid)
2573 {
2574         struct ieee80211_sub_if_data *sdata;
2575         struct ieee80211_if_sta *ifsta;
2576         int res;
2577
2578         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2579         ifsta = &sdata->u.sta;
2580
2581         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2582                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2583                 res = ieee80211_if_config(dev);
2584                 if (res) {
2585                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2586                                "the low-level driver\n", dev->name);
2587                         return res;
2588                 }
2589         }
2590
2591         if (!is_valid_ether_addr(bssid))
2592                 ifsta->bssid_set = 0;
2593         else
2594                 ifsta->bssid_set = 1;
2595         return 0;
2596 }
2597
2598
2599 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
2600                                     struct ieee80211_sub_if_data *sdata,
2601                                     int powersave)
2602 {
2603         struct sk_buff *skb;
2604         struct ieee80211_hdr *nullfunc;
2605         u16 fc;
2606
2607         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2608         if (!skb) {
2609                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2610                        "frame\n", sdata->dev->name);
2611                 return;
2612         }
2613         skb_reserve(skb, local->hw.extra_tx_headroom);
2614
2615         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2616         memset(nullfunc, 0, 24);
2617         fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2618              IEEE80211_FCTL_TODS;
2619         if (powersave)
2620                 fc |= IEEE80211_FCTL_PM;
2621         nullfunc->frame_control = cpu_to_le16(fc);
2622         memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
2623         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2624         memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
2625
2626         ieee80211_sta_tx(sdata->dev, skb, 0);
2627 }
2628
2629
2630 void ieee80211_scan_completed(struct ieee80211_hw *hw)
2631 {
2632         struct ieee80211_local *local = hw_to_local(hw);
2633         struct net_device *dev = local->scan_dev;
2634         struct ieee80211_sub_if_data *sdata;
2635         union iwreq_data wrqu;
2636
2637         local->last_scan_completed = jiffies;
2638         wmb();
2639         local->sta_scanning = 0;
2640
2641         if (ieee80211_hw_config(local))
2642                 printk(KERN_DEBUG "%s: failed to restore operational"
2643                        "channel after scan\n", dev->name);
2644
2645         if (!(local->hw.flags & IEEE80211_HW_NO_PROBE_FILTERING) &&
2646             ieee80211_if_config(dev))
2647                 printk(KERN_DEBUG "%s: failed to restore operational"
2648                        "BSSID after scan\n", dev->name);
2649
2650         memset(&wrqu, 0, sizeof(wrqu));
2651         wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
2652
2653         read_lock(&local->sub_if_lock);
2654         list_for_each_entry(sdata, &local->sub_if_list, list) {
2655
2656                 /* No need to wake the master device. */
2657                 if (sdata->dev == local->mdev)
2658                         continue;
2659
2660                 if (sdata->type == IEEE80211_IF_TYPE_STA) {
2661                         if (sdata->u.sta.associated)
2662                                 ieee80211_send_nullfunc(local, sdata, 0);
2663                         ieee80211_sta_timer((unsigned long)sdata);
2664                 }
2665
2666                 netif_wake_queue(sdata->dev);
2667         }
2668         read_unlock(&local->sub_if_lock);
2669
2670         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2671         if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
2672                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2673                 if (!ifsta->bssid_set ||
2674                     (!ifsta->state == IEEE80211_IBSS_JOINED &&
2675                     !ieee80211_sta_active_ibss(dev)))
2676                         ieee80211_sta_find_ibss(dev, ifsta);
2677         }
2678 }
2679 EXPORT_SYMBOL(ieee80211_scan_completed);
2680
2681 void ieee80211_sta_scan_work(struct work_struct *work)
2682 {
2683         struct ieee80211_local *local =
2684                 container_of(work, struct ieee80211_local, scan_work.work);
2685         struct net_device *dev = local->scan_dev;
2686         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2687         struct ieee80211_hw_mode *mode;
2688         struct ieee80211_channel *chan;
2689         int skip;
2690         unsigned long next_delay = 0;
2691
2692         if (!local->sta_scanning)
2693                 return;
2694
2695         switch (local->scan_state) {
2696         case SCAN_SET_CHANNEL:
2697                 mode = local->scan_hw_mode;
2698                 if (local->scan_hw_mode->list.next == &local->modes_list &&
2699                     local->scan_channel_idx >= mode->num_channels) {
2700                         ieee80211_scan_completed(local_to_hw(local));
2701                         return;
2702                 }
2703                 skip = !(local->enabled_modes & (1 << mode->mode));
2704                 chan = &mode->channels[local->scan_channel_idx];
2705                 if (!(chan->flag & IEEE80211_CHAN_W_SCAN) ||
2706                     (sdata->type == IEEE80211_IF_TYPE_IBSS &&
2707                      !(chan->flag & IEEE80211_CHAN_W_IBSS)) ||
2708                     (local->hw_modes & local->enabled_modes &
2709                      (1 << MODE_IEEE80211G) && mode->mode == MODE_IEEE80211B))
2710                         skip = 1;
2711
2712                 if (!skip) {
2713 #if 0
2714                         printk(KERN_DEBUG "%s: scan channel %d (%d MHz)\n",
2715                                dev->name, chan->chan, chan->freq);
2716 #endif
2717
2718                         local->scan_channel = chan;
2719                         if (ieee80211_hw_config(local)) {
2720                                 printk(KERN_DEBUG "%s: failed to set channel "
2721                                        "%d (%d MHz) for scan\n", dev->name,
2722                                        chan->chan, chan->freq);
2723                                 skip = 1;
2724                         }
2725                 }
2726
2727                 local->scan_channel_idx++;
2728                 if (local->scan_channel_idx >= local->scan_hw_mode->num_channels) {
2729                         if (local->scan_hw_mode->list.next != &local->modes_list) {
2730                                 local->scan_hw_mode = list_entry(local->scan_hw_mode->list.next,
2731                                                                  struct ieee80211_hw_mode,
2732                                                                  list);
2733                                 local->scan_channel_idx = 0;
2734                         }
2735                 }
2736
2737                 if (skip)
2738                         break;
2739
2740                 next_delay = IEEE80211_PROBE_DELAY +
2741                              usecs_to_jiffies(local->hw.channel_change_time);
2742                 local->scan_state = SCAN_SEND_PROBE;
2743                 break;
2744         case SCAN_SEND_PROBE:
2745                 if (local->scan_channel->flag & IEEE80211_CHAN_W_ACTIVE_SCAN) {
2746                         ieee80211_send_probe_req(dev, NULL, local->scan_ssid,
2747                                                  local->scan_ssid_len);
2748                         next_delay = IEEE80211_CHANNEL_TIME;
2749                 } else
2750                         next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
2751                 local->scan_state = SCAN_SET_CHANNEL;
2752                 break;
2753         }
2754
2755         if (local->sta_scanning)
2756                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2757                                    next_delay);
2758 }
2759
2760
2761 static int ieee80211_sta_start_scan(struct net_device *dev,
2762                                     u8 *ssid, size_t ssid_len)
2763 {
2764         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2765         struct ieee80211_sub_if_data *sdata;
2766
2767         if (ssid_len > IEEE80211_MAX_SSID_LEN)
2768                 return -EINVAL;
2769
2770         /* MLME-SCAN.request (page 118)  page 144 (11.1.3.1)
2771          * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
2772          * BSSID: MACAddress
2773          * SSID
2774          * ScanType: ACTIVE, PASSIVE
2775          * ProbeDelay: delay (in microseconds) to be used prior to transmitting
2776          *    a Probe frame during active scanning
2777          * ChannelList
2778          * MinChannelTime (>= ProbeDelay), in TU
2779          * MaxChannelTime: (>= MinChannelTime), in TU
2780          */
2781
2782          /* MLME-SCAN.confirm
2783           * BSSDescriptionSet
2784           * ResultCode: SUCCESS, INVALID_PARAMETERS
2785          */
2786
2787         if (local->sta_scanning) {
2788                 if (local->scan_dev == dev)
2789                         return 0;
2790                 return -EBUSY;
2791         }
2792
2793         if (local->ops->hw_scan) {
2794                 int rc = local->ops->hw_scan(local_to_hw(local),
2795                                             ssid, ssid_len);
2796                 if (!rc) {
2797                         local->sta_scanning = 1;
2798                         local->scan_dev = dev;
2799                 }
2800                 return rc;
2801         }
2802
2803         local->sta_scanning = 1;
2804
2805         read_lock(&local->sub_if_lock);
2806         list_for_each_entry(sdata, &local->sub_if_list, list) {
2807
2808                 /* Don't stop the master interface, otherwise we can't transmit
2809                  * probes! */
2810                 if (sdata->dev == local->mdev)
2811                         continue;
2812
2813                 netif_stop_queue(sdata->dev);
2814                 if (sdata->type == IEEE80211_IF_TYPE_STA &&
2815                     sdata->u.sta.associated)
2816                         ieee80211_send_nullfunc(local, sdata, 1);
2817         }
2818         read_unlock(&local->sub_if_lock);
2819
2820         if (ssid) {
2821                 local->scan_ssid_len = ssid_len;
2822                 memcpy(local->scan_ssid, ssid, ssid_len);
2823         } else
2824                 local->scan_ssid_len = 0;
2825         local->scan_state = SCAN_SET_CHANNEL;
2826         local->scan_hw_mode = list_entry(local->modes_list.next,
2827                                          struct ieee80211_hw_mode,
2828                                          list);
2829         local->scan_channel_idx = 0;
2830         local->scan_dev = dev;
2831
2832         if (!(local->hw.flags & IEEE80211_HW_NO_PROBE_FILTERING) &&
2833             ieee80211_if_config(dev))
2834                 printk(KERN_DEBUG "%s: failed to set BSSID for scan\n",
2835                        dev->name);
2836
2837         /* TODO: start scan as soon as all nullfunc frames are ACKed */
2838         queue_delayed_work(local->hw.workqueue, &local->scan_work,
2839                            IEEE80211_CHANNEL_TIME);
2840
2841         return 0;
2842 }
2843
2844
2845 int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
2846 {
2847         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2848         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2849         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2850
2851         if (sdata->type != IEEE80211_IF_TYPE_STA)
2852                 return ieee80211_sta_start_scan(dev, ssid, ssid_len);
2853
2854         if (local->sta_scanning) {
2855                 if (local->scan_dev == dev)
2856                         return 0;
2857                 return -EBUSY;
2858         }
2859
2860         set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
2861         queue_work(local->hw.workqueue, &ifsta->work);
2862         return 0;
2863 }
2864
2865 static char *
2866 ieee80211_sta_scan_result(struct net_device *dev,
2867                           struct ieee80211_sta_bss *bss,
2868                           char *current_ev, char *end_buf)
2869 {
2870         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2871         struct iw_event iwe;
2872
2873         if (time_after(jiffies,
2874                        bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
2875                 return current_ev;
2876
2877         if (!(local->enabled_modes & (1 << bss->hw_mode)))
2878                 return current_ev;
2879
2880         if (local->scan_flags & IEEE80211_SCAN_WPA_ONLY &&
2881             !bss->wpa_ie && !bss->rsn_ie)
2882                 return current_ev;
2883
2884         if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID &&
2885             (local->scan_ssid_len != bss->ssid_len ||
2886              memcmp(local->scan_ssid, bss->ssid, bss->ssid_len) != 0))
2887                 return current_ev;
2888
2889         memset(&iwe, 0, sizeof(iwe));
2890         iwe.cmd = SIOCGIWAP;
2891         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2892         memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2893         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2894                                           IW_EV_ADDR_LEN);
2895
2896         memset(&iwe, 0, sizeof(iwe));
2897         iwe.cmd = SIOCGIWESSID;
2898         iwe.u.data.length = bss->ssid_len;
2899         iwe.u.data.flags = 1;
2900         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2901                                           bss->ssid);
2902
2903         if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)) {
2904                 memset(&iwe, 0, sizeof(iwe));
2905                 iwe.cmd = SIOCGIWMODE;
2906                 if (bss->capability & WLAN_CAPABILITY_ESS)
2907                         iwe.u.mode = IW_MODE_MASTER;
2908                 else
2909                         iwe.u.mode = IW_MODE_ADHOC;
2910                 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2911                                                   IW_EV_UINT_LEN);
2912         }
2913
2914         memset(&iwe, 0, sizeof(iwe));
2915         iwe.cmd = SIOCGIWFREQ;
2916         iwe.u.freq.m = bss->channel;
2917         iwe.u.freq.e = 0;
2918         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2919                                           IW_EV_FREQ_LEN);
2920         iwe.u.freq.m = bss->freq * 100000;
2921         iwe.u.freq.e = 1;
2922         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2923                                           IW_EV_FREQ_LEN);
2924
2925         memset(&iwe, 0, sizeof(iwe));
2926         iwe.cmd = IWEVQUAL;
2927         iwe.u.qual.qual = bss->signal;
2928         iwe.u.qual.level = bss->rssi;
2929         iwe.u.qual.noise = bss->noise;
2930         iwe.u.qual.updated = local->wstats_flags;
2931         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2932                                           IW_EV_QUAL_LEN);
2933
2934         memset(&iwe, 0, sizeof(iwe));
2935         iwe.cmd = SIOCGIWENCODE;
2936         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
2937                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2938         else
2939                 iwe.u.data.flags = IW_ENCODE_DISABLED;
2940         iwe.u.data.length = 0;
2941         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, "");
2942
2943         if (bss && bss->wpa_ie) {
2944                 memset(&iwe, 0, sizeof(iwe));
2945                 iwe.cmd = IWEVGENIE;
2946                 iwe.u.data.length = bss->wpa_ie_len;
2947                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2948                                                   bss->wpa_ie);
2949         }
2950
2951         if (bss && bss->rsn_ie) {
2952                 memset(&iwe, 0, sizeof(iwe));
2953                 iwe.cmd = IWEVGENIE;
2954                 iwe.u.data.length = bss->rsn_ie_len;
2955                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2956                                                   bss->rsn_ie);
2957         }
2958
2959         if (bss && bss->supp_rates_len > 0) {
2960                 /* display all supported rates in readable format */
2961                 char *p = current_ev + IW_EV_LCP_LEN;
2962                 int i;
2963
2964                 memset(&iwe, 0, sizeof(iwe));
2965                 iwe.cmd = SIOCGIWRATE;
2966                 /* Those two flags are ignored... */
2967                 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2968
2969                 for (i = 0; i < bss->supp_rates_len; i++) {
2970                         iwe.u.bitrate.value = ((bss->supp_rates[i] &
2971                                                         0x7f) * 500000);
2972                         p = iwe_stream_add_value(current_ev, p,
2973                                         end_buf, &iwe, IW_EV_PARAM_LEN);
2974                 }
2975                 current_ev = p;
2976         }
2977
2978         if (bss) {
2979                 char *buf;
2980                 buf = kmalloc(30, GFP_ATOMIC);
2981                 if (buf) {
2982                         memset(&iwe, 0, sizeof(iwe));
2983                         iwe.cmd = IWEVCUSTOM;
2984                         sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
2985                         iwe.u.data.length = strlen(buf);
2986                         current_ev = iwe_stream_add_point(current_ev, end_buf,
2987                                                           &iwe, buf);
2988                         kfree(buf);
2989                 }
2990         }
2991
2992         do {
2993                 char *buf;
2994
2995                 if (!(local->scan_flags & IEEE80211_SCAN_EXTRA_INFO))
2996                         break;
2997
2998                 buf = kmalloc(100, GFP_ATOMIC);
2999                 if (!buf)
3000                         break;
3001
3002                 memset(&iwe, 0, sizeof(iwe));
3003                 iwe.cmd = IWEVCUSTOM;
3004                 sprintf(buf, "bcn_int=%d", bss->beacon_int);
3005                 iwe.u.data.length = strlen(buf);
3006                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3007                                                   buf);
3008
3009                 memset(&iwe, 0, sizeof(iwe));
3010                 iwe.cmd = IWEVCUSTOM;
3011                 sprintf(buf, "capab=0x%04x", bss->capability);
3012                 iwe.u.data.length = strlen(buf);
3013                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3014                                                   buf);
3015
3016                 kfree(buf);
3017                 break;
3018         } while (0);
3019
3020         return current_ev;
3021 }
3022
3023
3024 int ieee80211_sta_scan_results(struct net_device *dev, char *buf, size_t len)
3025 {
3026         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3027         char *current_ev = buf;
3028         char *end_buf = buf + len;
3029         struct ieee80211_sta_bss *bss;
3030
3031         spin_lock_bh(&local->sta_bss_lock);
3032         list_for_each_entry(bss, &local->sta_bss_list, list) {
3033                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3034                         spin_unlock_bh(&local->sta_bss_lock);
3035                         return -E2BIG;
3036                 }
3037                 current_ev = ieee80211_sta_scan_result(dev, bss, current_ev,
3038                                                        end_buf);
3039         }
3040         spin_unlock_bh(&local->sta_bss_lock);
3041         return current_ev - buf;
3042 }
3043
3044
3045 int ieee80211_sta_set_extra_ie(struct net_device *dev, char *ie, size_t len)
3046 {
3047         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3048         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3049         kfree(ifsta->extra_ie);
3050         if (len == 0) {
3051                 ifsta->extra_ie = NULL;
3052                 ifsta->extra_ie_len = 0;
3053                 return 0;
3054         }
3055         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
3056         if (!ifsta->extra_ie) {
3057                 ifsta->extra_ie_len = 0;
3058                 return -ENOMEM;
3059         }
3060         memcpy(ifsta->extra_ie, ie, len);
3061         ifsta->extra_ie_len = len;
3062         return 0;
3063 }
3064
3065
3066 struct sta_info * ieee80211_ibss_add_sta(struct net_device *dev,
3067                                          struct sk_buff *skb, u8 *bssid,
3068                                          u8 *addr)
3069 {
3070         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3071         struct sta_info *sta;
3072         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3073
3074         /* TODO: Could consider removing the least recently used entry and
3075          * allow new one to be added. */
3076         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
3077                 if (net_ratelimit()) {
3078                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
3079                                "entry " MAC_FMT "\n", dev->name, MAC_ARG(addr));
3080                 }
3081                 return NULL;
3082         }
3083
3084         printk(KERN_DEBUG "%s: Adding new IBSS station " MAC_FMT " (dev=%s)\n",
3085                local->mdev->name, MAC_ARG(addr), dev->name);
3086
3087         sta = sta_info_add(local, dev, addr, GFP_ATOMIC);
3088         if (!sta)
3089                 return NULL;
3090
3091         sta->supp_rates = sdata->u.sta.supp_rates_bits;
3092
3093         rate_control_rate_init(sta, local);
3094
3095         return sta; /* caller will call sta_info_put() */
3096 }
3097
3098
3099 int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason)
3100 {
3101         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3102         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3103
3104         printk(KERN_DEBUG "%s: deauthenticate(reason=%d)\n",
3105                dev->name, reason);
3106
3107         if (sdata->type != IEEE80211_IF_TYPE_STA &&
3108             sdata->type != IEEE80211_IF_TYPE_IBSS)
3109                 return -EINVAL;
3110
3111         ieee80211_send_deauth(dev, ifsta, reason);
3112         ieee80211_set_disassoc(dev, ifsta, 1);
3113         return 0;
3114 }
3115
3116
3117 int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
3118 {
3119         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3120         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3121
3122         printk(KERN_DEBUG "%s: disassociate(reason=%d)\n",
3123                dev->name, reason);
3124
3125         if (sdata->type != IEEE80211_IF_TYPE_STA)
3126                 return -EINVAL;
3127
3128         if (!ifsta->associated)
3129                 return -1;
3130
3131         ieee80211_send_disassoc(dev, ifsta, reason);
3132         ieee80211_set_disassoc(dev, ifsta, 0);
3133         return 0;
3134 }