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 "ieee80211_led.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 enum ParseRes { ParseOK = 0, ParseUnknown = 1, ParseFailed = -1 };
 112
 113 static enum ParseRes ieee802_11_parse_elems(u8 *start, size_t len,
 114                                             struct ieee802_11_elems *elems)
 115 {
 116         size_t left = len;
 117         u8 *pos = start;
 118         int unknown = 0;
 119
 120         memset(elems, 0, sizeof(*elems));
 121
 122         while (left >= 2) {
 123                 u8 id, elen;
 124
 125                 id = *pos++;
 126                 elen = *pos++;
 127                 left -= 2;
 128
 129                 if (elen > left) {
 130 #if 0
 131                         if (net_ratelimit())
 132                                 printk(KERN_DEBUG "IEEE 802.11 element parse "
 133                                        "failed (id=%d elen=%d left=%d)\n",
 134                                        id, elen, left);
 135 #endif
 136                         return ParseFailed;
 137                 }
 138
 139                 switch (id) {
 140                 case WLAN_EID_SSID:
 141                         elems->ssid = pos;
 142                         elems->ssid_len = elen;
 143                         break;
 144                 case WLAN_EID_SUPP_RATES:
 145                         elems->supp_rates = pos;
 146                         elems->supp_rates_len = elen;
 147                         break;
 148                 case WLAN_EID_FH_PARAMS:
 149                         elems->fh_params = pos;
 150                         elems->fh_params_len = elen;
 151                         break;
 152                 case WLAN_EID_DS_PARAMS:
 153                         elems->ds_params = pos;
 154                         elems->ds_params_len = elen;
 155                         break;
 156                 case WLAN_EID_CF_PARAMS:
 157                         elems->cf_params = pos;
 158                         elems->cf_params_len = elen;
 159                         break;
 160                 case WLAN_EID_TIM:
 161                         elems->tim = pos;
 162                         elems->tim_len = elen;
 163                         break;
 164                 case WLAN_EID_IBSS_PARAMS:
 165                         elems->ibss_params = pos;
 166                         elems->ibss_params_len = elen;
 167                         break;
 168                 case WLAN_EID_CHALLENGE:
 169                         elems->challenge = pos;
 170                         elems->challenge_len = elen;
 171                         break;
 172                 case WLAN_EID_WPA:
 173                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 174                             pos[2] == 0xf2) {
 175                                 /* Microsoft OUI (00:50:F2) */
 176                                 if (pos[3] == 1) {
 177                                         /* OUI Type 1 - WPA IE */
 178                                         elems->wpa = pos;
 179                                         elems->wpa_len = elen;
 180                                 } else if (elen >= 5 && pos[3] == 2) {
 181                                         if (pos[4] == 0) {
 182                                                 elems->wmm_info = pos;
 183                                                 elems->wmm_info_len = elen;
 184                                         } else if (pos[4] == 1) {
 185                                                 elems->wmm_param = pos;
 186                                                 elems->wmm_param_len = elen;
 187                                         }
 188                                 }
 189                         }
 190                         break;
 191                 case WLAN_EID_RSN:
 192                         elems->rsn = pos;
 193                         elems->rsn_len = elen;
 194                         break;
 195                 case WLAN_EID_ERP_INFO:
 196                         elems->erp_info = pos;
 197                         elems->erp_info_len = elen;
 198                         break;
 199                 case WLAN_EID_EXT_SUPP_RATES:
 200                         elems->ext_supp_rates = pos;
 201                         elems->ext_supp_rates_len = elen;
 202                         break;
 203                 default:
 204 #if 0
 205                         printk(KERN_DEBUG "IEEE 802.11 element parse ignored "
 206                                       "unknown element (id=%d elen=%d)\n",
 207                                       id, elen);
 208 #endif
 209                         unknown++;
 210                         break;
 211                 }
 212
 213                 left -= elen;
 214                 pos += elen;
 215         }
 216
 217         /* Do not trigger error if left == 1 as Apple Airport base stations
 218          * send AssocResps that are one spurious byte too long. */
 219
 220         return unknown ? ParseUnknown : ParseOK;
 221 }
 222
 223
 224
 225
 226 static int ecw2cw(int ecw)
 227 {
 228         int cw = 1;
 229         while (ecw > 0) {
 230                 cw <<= 1;
 231                 ecw--;
 232         }
 233         return cw - 1;
 234 }
 235
 236 static void ieee80211_sta_wmm_params(struct net_device *dev,
 237                                      struct ieee80211_if_sta *ifsta,
 238                                      u8 *wmm_param, size_t wmm_param_len)
 239 {
 240         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 241         struct ieee80211_tx_queue_params params;
 242         size_t left;
 243         int count;
 244         u8 *pos;
 245
 246         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 247                 return;
 248         count = wmm_param[6] & 0x0f;
 249         if (count == ifsta->wmm_last_param_set)
 250                 return;
 251         ifsta->wmm_last_param_set = count;
 252
 253         pos = wmm_param + 8;
 254         left = wmm_param_len - 8;
 255
 256         memset(&params, 0, sizeof(params));
 257
 258         if (!local->ops->conf_tx)
 259                 return;
 260
 261         local->wmm_acm = 0;
 262         for (; left >= 4; left -= 4, pos += 4) {
 263                 int aci = (pos[0] >> 5) & 0x03;
 264                 int acm = (pos[0] >> 4) & 0x01;
 265                 int queue;
 266
 267                 switch (aci) {
 268                 case 1:
 269                         queue = IEEE80211_TX_QUEUE_DATA3;
 270                         if (acm) {
 271                                 local->wmm_acm |= BIT(0) | BIT(3);
 272                         }
 273                         break;
 274                 case 2:
 275                         queue = IEEE80211_TX_QUEUE_DATA1;
 276                         if (acm) {
 277                                 local->wmm_acm |= BIT(4) | BIT(5);
 278                         }
 279                         break;
 280                 case 3:
 281                         queue = IEEE80211_TX_QUEUE_DATA0;
 282                         if (acm) {
 283                                 local->wmm_acm |= BIT(6) | BIT(7);
 284                         }
 285                         break;
 286                 case 0:
 287                 default:
 288                         queue = IEEE80211_TX_QUEUE_DATA2;
 289                         if (acm) {
 290                                 local->wmm_acm |= BIT(1) | BIT(2);
 291                         }
 292                         break;
 293                 }
 294
 295                 params.aifs = pos[0] & 0x0f;
 296                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 297                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 298                 /* TXOP is in units of 32 usec; burst_time in 0.1 ms */
 299                 params.burst_time = (pos[2] | (pos[3] << 8)) * 32 / 100;
 300                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 301                        "cWmin=%d cWmax=%d burst=%d\n",
 302                        dev->name, queue, aci, acm, params.aifs, params.cw_min,
 303                        params.cw_max, params.burst_time);
 304                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 305                  * AC for now) */
 306                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 307                         printk(KERN_DEBUG "%s: failed to set TX queue "
 308                                "parameters for queue %d\n", dev->name, queue);
 309                 }
 310         }
 311 }
 312
 313
 314 static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
 315 {
 316         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 317         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 318         int use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
 319         int preamble_mode = (erp_value & WLAN_ERP_BARKER_PREAMBLE) != 0;
 320         u8 changes = 0;
 321         DECLARE_MAC_BUF(mac);
 322
 323         if (use_protection != !!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION)) {
 324                 if (net_ratelimit()) {
 325                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
 326                                "%s)\n",
 327                                dev->name,
 328                                use_protection ? "enabled" : "disabled",
 329                                print_mac(mac, ifsta->bssid));
 330                 }
 331                 if (use_protection)
 332                         sdata->flags |= IEEE80211_SDATA_USE_PROTECTION;
 333                 else
 334                         sdata->flags &= ~IEEE80211_SDATA_USE_PROTECTION;
 335                 changes |= IEEE80211_ERP_CHANGE_PROTECTION;
 336         }
 337
 338         if (preamble_mode != !(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE)) {
 339                 if (net_ratelimit()) {
 340                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 341                                " (BSSID=%s)\n",
 342                                dev->name,
 343                                (preamble_mode == WLAN_ERP_PREAMBLE_SHORT) ?
 344                                         "short" : "long",
 345                                print_mac(mac, ifsta->bssid));
 346                 }
 347                 if (preamble_mode)
 348                         sdata->flags &= ~IEEE80211_SDATA_SHORT_PREAMBLE;
 349                 else
 350                         sdata->flags |= IEEE80211_SDATA_SHORT_PREAMBLE;
 351                 changes |= IEEE80211_ERP_CHANGE_PREAMBLE;
 352         }
 353
 354         if (changes)
 355                 ieee80211_erp_info_change_notify(dev, changes);
 356 }
 357
 358
 359 static void ieee80211_sta_send_associnfo(struct net_device *dev,
 360                                          struct ieee80211_if_sta *ifsta)
 361 {
 362         char *buf;
 363         size_t len;
 364         int i;
 365         union iwreq_data wrqu;
 366
 367         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 368                 return;
 369
 370         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 371                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 372         if (!buf)
 373                 return;
 374
 375         len = sprintf(buf, "ASSOCINFO(");
 376         if (ifsta->assocreq_ies) {
 377                 len += sprintf(buf + len, "ReqIEs=");
 378                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 379                         len += sprintf(buf + len, "%02x",
 380                                        ifsta->assocreq_ies[i]);
 381                 }
 382         }
 383         if (ifsta->assocresp_ies) {
 384                 if (ifsta->assocreq_ies)
 385                         len += sprintf(buf + len, " ");
 386                 len += sprintf(buf + len, "RespIEs=");
 387                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 388                         len += sprintf(buf + len, "%02x",
 389                                        ifsta->assocresp_ies[i]);
 390                 }
 391         }
 392         len += sprintf(buf + len, ")");
 393
 394         if (len > IW_CUSTOM_MAX) {
 395                 len = sprintf(buf, "ASSOCRESPIE=");
 396                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 397                         len += sprintf(buf + len, "%02x",
 398                                        ifsta->assocresp_ies[i]);
 399                 }
 400         }
 401
 402         memset(&wrqu, 0, sizeof(wrqu));
 403         wrqu.data.length = len;
 404         wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 405
 406         kfree(buf);
 407 }
 408
 409
 410 static void ieee80211_set_associated(struct net_device *dev,
 411                                      struct ieee80211_if_sta *ifsta,
 412                                      bool assoc)
 413 {
 414         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 415         union iwreq_data wrqu;
 416
 417         if (!!(ifsta->flags & IEEE80211_STA_ASSOCIATED) == assoc)
 418                 return;
 419
 420         if (assoc) {
 421                 struct ieee80211_sub_if_data *sdata;
 422                 struct ieee80211_sta_bss *bss;
 423
 424                 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 425
 426                 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 427                 if (sdata->type != IEEE80211_IF_TYPE_STA)
 428                         return;
 429
 430                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
 431                 if (bss) {
 432                         if (bss->has_erp_value)
 433                                 ieee80211_handle_erp_ie(dev, bss->erp_value);
 434                         ieee80211_rx_bss_put(dev, bss);
 435                 }
 436
 437                 netif_carrier_on(dev);
 438                 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 439                 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 440                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 441                 ieee80211_sta_send_associnfo(dev, ifsta);
 442         } else {
 443                 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 444
 445                 netif_carrier_off(dev);
 446                 ieee80211_reset_erp_info(dev);
 447                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 448         }
 449         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 450         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 451         ifsta->last_probe = jiffies;
 452         ieee80211_led_assoc(local, assoc);
 453 }
 454
 455 static void ieee80211_set_disassoc(struct net_device *dev,
 456                                    struct ieee80211_if_sta *ifsta, int deauth)
 457 {
 458         if (deauth)
 459                 ifsta->auth_tries = 0;
 460         ifsta->assoc_tries = 0;
 461         ieee80211_set_associated(dev, ifsta, 0);
 462 }
 463
 464 static void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
 465                              int encrypt)
 466 {
 467         struct ieee80211_sub_if_data *sdata;
 468         struct ieee80211_tx_packet_data *pkt_data;
 469
 470         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 471         skb->dev = sdata->local->mdev;
 472         skb_set_mac_header(skb, 0);
 473         skb_set_network_header(skb, 0);
 474         skb_set_transport_header(skb, 0);
 475
 476         pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 477         memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
 478         pkt_data->ifindex = sdata->dev->ifindex;
 479         if (!encrypt)
 480                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
 481
 482         dev_queue_xmit(skb);
 483 }
 484
 485
 486 static void ieee80211_send_auth(struct net_device *dev,
 487                                 struct ieee80211_if_sta *ifsta,
 488                                 int transaction, u8 *extra, size_t extra_len,
 489                                 int encrypt)
 490 {
 491         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 492         struct sk_buff *skb;
 493         struct ieee80211_mgmt *mgmt;
 494
 495         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 496                             sizeof(*mgmt) + 6 + extra_len);
 497         if (!skb) {
 498                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 499                        "frame\n", dev->name);
 500                 return;
 501         }
 502         skb_reserve(skb, local->hw.extra_tx_headroom);
 503
 504         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 505         memset(mgmt, 0, 24 + 6);
 506         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 507                                            IEEE80211_STYPE_AUTH);
 508         if (encrypt)
 509                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 510         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 511         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 512         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 513         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 514         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 515         ifsta->auth_transaction = transaction + 1;
 516         mgmt->u.auth.status_code = cpu_to_le16(0);
 517         if (extra)
 518                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 519
 520         ieee80211_sta_tx(dev, skb, encrypt);
 521 }
 522
 523
 524 static void ieee80211_authenticate(struct net_device *dev,
 525                                    struct ieee80211_if_sta *ifsta)
 526 {
 527         DECLARE_MAC_BUF(mac);
 528
 529         ifsta->auth_tries++;
 530         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 531                 printk(KERN_DEBUG "%s: authentication with AP %s"
 532                        " timed out\n",
 533                        dev->name, print_mac(mac, ifsta->bssid));
 534                 ifsta->state = IEEE80211_DISABLED;
 535                 return;
 536         }
 537
 538         ifsta->state = IEEE80211_AUTHENTICATE;
 539         printk(KERN_DEBUG "%s: authenticate with AP %s\n",
 540                dev->name, print_mac(mac, ifsta->bssid));
 541
 542         ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);
 543
 544         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 545 }
 546
 547
 548 static void ieee80211_send_assoc(struct net_device *dev,
 549                                  struct ieee80211_if_sta *ifsta)
 550 {
 551         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 552         struct ieee80211_hw_mode *mode;
 553         struct sk_buff *skb;
 554         struct ieee80211_mgmt *mgmt;
 555         u8 *pos, *ies;
 556         int i, len;
 557         u16 capab;
 558         struct ieee80211_sta_bss *bss;
 559         int wmm = 0;
 560
 561         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 562                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 563                             ifsta->ssid_len);
 564         if (!skb) {
 565                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 566                        "frame\n", dev->name);
 567                 return;
 568         }
 569         skb_reserve(skb, local->hw.extra_tx_headroom);
 570
 571         mode = local->oper_hw_mode;
 572         capab = ifsta->capab;
 573         if (mode->mode == MODE_IEEE80211G) {
 574                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME |
 575                         WLAN_CAPABILITY_SHORT_PREAMBLE;
 576         }
 577         bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
 578         if (bss) {
 579                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 580                         capab |= WLAN_CAPABILITY_PRIVACY;
 581                 if (bss->wmm_ie) {
 582                         wmm = 1;
 583                 }
 584                 ieee80211_rx_bss_put(dev, bss);
 585         }
 586
 587         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 588         memset(mgmt, 0, 24);
 589         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 590         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 591         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 592
 593         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 594                 skb_put(skb, 10);
 595                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 596                                                    IEEE80211_STYPE_REASSOC_REQ);
 597                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 598                 mgmt->u.reassoc_req.listen_interval = cpu_to_le16(1);
 599                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 600                        ETH_ALEN);
 601         } else {
 602                 skb_put(skb, 4);
 603                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 604                                                    IEEE80211_STYPE_ASSOC_REQ);
 605                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 606                 mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
 607         }
 608
 609         /* SSID */
 610         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 611         *pos++ = WLAN_EID_SSID;
 612         *pos++ = ifsta->ssid_len;
 613         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 614
 615         len = mode->num_rates;
 616         if (len > 8)
 617                 len = 8;
 618         pos = skb_put(skb, len + 2);
 619         *pos++ = WLAN_EID_SUPP_RATES;
 620         *pos++ = len;
 621         for (i = 0; i < len; i++) {
 622                 int rate = mode->rates[i].rate;
 623                 *pos++ = (u8) (rate / 5);
 624         }
 625
 626         if (mode->num_rates > len) {
 627                 pos = skb_put(skb, mode->num_rates - len + 2);
 628                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 629                 *pos++ = mode->num_rates - len;
 630                 for (i = len; i < mode->num_rates; i++) {
 631                         int rate = mode->rates[i].rate;
 632                         *pos++ = (u8) (rate / 5);
 633                 }
 634         }
 635
 636         if (ifsta->extra_ie) {
 637                 pos = skb_put(skb, ifsta->extra_ie_len);
 638                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 639         }
 640
 641         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 642                 pos = skb_put(skb, 9);
 643                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 644                 *pos++ = 7; /* len */
 645                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 646                 *pos++ = 0x50;
 647                 *pos++ = 0xf2;
 648                 *pos++ = 2; /* WME */
 649                 *pos++ = 0; /* WME info */
 650                 *pos++ = 1; /* WME ver */
 651                 *pos++ = 0;
 652         }
 653
 654         kfree(ifsta->assocreq_ies);
 655         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 656         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 657         if (ifsta->assocreq_ies)
 658                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 659
 660         ieee80211_sta_tx(dev, skb, 0);
 661 }
 662
 663
 664 static void ieee80211_send_deauth(struct net_device *dev,
 665                                   struct ieee80211_if_sta *ifsta, u16 reason)
 666 {
 667         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 668         struct sk_buff *skb;
 669         struct ieee80211_mgmt *mgmt;
 670
 671         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 672         if (!skb) {
 673                 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
 674                        "frame\n", dev->name);
 675                 return;
 676         }
 677         skb_reserve(skb, local->hw.extra_tx_headroom);
 678
 679         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 680         memset(mgmt, 0, 24);
 681         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 682         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 683         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 684         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 685                                            IEEE80211_STYPE_DEAUTH);
 686         skb_put(skb, 2);
 687         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 688
 689         ieee80211_sta_tx(dev, skb, 0);
 690 }
 691
 692
 693 static void ieee80211_send_disassoc(struct net_device *dev,
 694                                     struct ieee80211_if_sta *ifsta, u16 reason)
 695 {
 696         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 697         struct sk_buff *skb;
 698         struct ieee80211_mgmt *mgmt;
 699
 700         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 701         if (!skb) {
 702                 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
 703                        "frame\n", dev->name);
 704                 return;
 705         }
 706         skb_reserve(skb, local->hw.extra_tx_headroom);
 707
 708         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 709         memset(mgmt, 0, 24);
 710         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 711         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 712         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 713         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 714                                            IEEE80211_STYPE_DISASSOC);
 715         skb_put(skb, 2);
 716         mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
 717
 718         ieee80211_sta_tx(dev, skb, 0);
 719 }
 720
 721
 722 static int ieee80211_privacy_mismatch(struct net_device *dev,
 723                                       struct ieee80211_if_sta *ifsta)
 724 {
 725         struct ieee80211_sta_bss *bss;
 726         int res = 0;
 727
 728         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL) ||
 729             ifsta->key_management_enabled)
 730                 return 0;
 731
 732         bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
 733         if (!bss)
 734                 return 0;
 735
 736         if (ieee80211_sta_wep_configured(dev) !=
 737             !!(bss->capability & WLAN_CAPABILITY_PRIVACY))
 738                 res = 1;
 739
 740         ieee80211_rx_bss_put(dev, bss);
 741
 742         return res;
 743 }
 744
 745
 746 static void ieee80211_associate(struct net_device *dev,
 747                                 struct ieee80211_if_sta *ifsta)
 748 {
 749         DECLARE_MAC_BUF(mac);
 750
 751         ifsta->assoc_tries++;
 752         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 753                 printk(KERN_DEBUG "%s: association with AP %s"
 754                        " timed out\n",
 755                        dev->name, print_mac(mac, ifsta->bssid));
 756                 ifsta->state = IEEE80211_DISABLED;
 757                 return;
 758         }
 759
 760         ifsta->state = IEEE80211_ASSOCIATE;
 761         printk(KERN_DEBUG "%s: associate with AP %s\n",
 762                dev->name, print_mac(mac, ifsta->bssid));
 763         if (ieee80211_privacy_mismatch(dev, ifsta)) {
 764                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 765                        "mixed-cell disabled - abort association\n", dev->name);
 766                 ifsta->state = IEEE80211_DISABLED;
 767                 return;
 768         }
 769
 770         ieee80211_send_assoc(dev, ifsta);
 771
 772         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 773 }
 774
 775
 776 static void ieee80211_associated(struct net_device *dev,
 777                                  struct ieee80211_if_sta *ifsta)
 778 {
 779         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 780         struct sta_info *sta;
 781         int disassoc;
 782         DECLARE_MAC_BUF(mac);
 783
 784         /* TODO: start monitoring current AP signal quality and number of
 785          * missed beacons. Scan other channels every now and then and search
 786          * for better APs. */
 787         /* TODO: remove expired BSSes */
 788
 789         ifsta->state = IEEE80211_ASSOCIATED;
 790
 791         sta = sta_info_get(local, ifsta->bssid);
 792         if (!sta) {
 793                 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
 794                        dev->name, print_mac(mac, ifsta->bssid));
 795                 disassoc = 1;
 796         } else {
 797                 disassoc = 0;
 798                 if (time_after(jiffies,
 799                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 800                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
 801                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 802                                        "current AP %s - assume out of "
 803                                        "range\n",
 804                                        dev->name, print_mac(mac, ifsta->bssid));
 805                                 disassoc = 1;
 806                                 sta_info_free(sta);
 807                         } else
 808                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 809                                                          local->scan_ssid,
 810                                                          local->scan_ssid_len);
 811                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 812                 } else {
 813                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 814                         if (time_after(jiffies, ifsta->last_probe +
 815                                        IEEE80211_PROBE_INTERVAL)) {
 816                                 ifsta->last_probe = jiffies;
 817                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 818                                                          ifsta->ssid,
 819                                                          ifsta->ssid_len);
 820                         }
 821                 }
 822                 sta_info_put(sta);
 823         }
 824         if (disassoc) {
 825                 union iwreq_data wrqu;
 826                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 827                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 828                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 829                 mod_timer(&ifsta->timer, jiffies +
 830                                       IEEE80211_MONITORING_INTERVAL + 30 * HZ);
 831         } else {
 832                 mod_timer(&ifsta->timer, jiffies +
 833                                       IEEE80211_MONITORING_INTERVAL);
 834         }
 835 }
 836
 837
 838 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
 839                                      u8 *ssid, size_t ssid_len)
 840 {
 841         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 842         struct ieee80211_hw_mode *mode;
 843         struct sk_buff *skb;
 844         struct ieee80211_mgmt *mgmt;
 845         u8 *pos, *supp_rates, *esupp_rates = NULL;
 846         int i;
 847
 848         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
 849         if (!skb) {
 850                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 851                        "request\n", dev->name);
 852                 return;
 853         }
 854         skb_reserve(skb, local->hw.extra_tx_headroom);
 855
 856         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 857         memset(mgmt, 0, 24);
 858         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 859                                            IEEE80211_STYPE_PROBE_REQ);
 860         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 861         if (dst) {
 862                 memcpy(mgmt->da, dst, ETH_ALEN);
 863                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 864         } else {
 865                 memset(mgmt->da, 0xff, ETH_ALEN);
 866                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 867         }
 868         pos = skb_put(skb, 2 + ssid_len);
 869         *pos++ = WLAN_EID_SSID;
 870         *pos++ = ssid_len;
 871         memcpy(pos, ssid, ssid_len);
 872
 873         supp_rates = skb_put(skb, 2);
 874         supp_rates[0] = WLAN_EID_SUPP_RATES;
 875         supp_rates[1] = 0;
 876         mode = local->oper_hw_mode;
 877         for (i = 0; i < mode->num_rates; i++) {
 878                 struct ieee80211_rate *rate = &mode->rates[i];
 879                 if (!(rate->flags & IEEE80211_RATE_SUPPORTED))
 880                         continue;
 881                 if (esupp_rates) {
 882                         pos = skb_put(skb, 1);
 883                         esupp_rates[1]++;
 884                 } else if (supp_rates[1] == 8) {
 885                         esupp_rates = skb_put(skb, 3);
 886                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 887                         esupp_rates[1] = 1;
 888                         pos = &esupp_rates[2];
 889                 } else {
 890                         pos = skb_put(skb, 1);
 891                         supp_rates[1]++;
 892                 }
 893                 *pos = rate->rate / 5;
 894         }
 895
 896         ieee80211_sta_tx(dev, skb, 0);
 897 }
 898
 899
 900 static int ieee80211_sta_wep_configured(struct net_device *dev)
 901 {
 902         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 903         if (!sdata || !sdata->default_key ||
 904             sdata->default_key->conf.alg != ALG_WEP)
 905                 return 0;
 906         return 1;
 907 }
 908
 909
 910 static void ieee80211_auth_completed(struct net_device *dev,
 911                                      struct ieee80211_if_sta *ifsta)
 912 {
 913         printk(KERN_DEBUG "%s: authenticated\n", dev->name);
 914         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
 915         ieee80211_associate(dev, ifsta);
 916 }
 917
 918
 919 static void ieee80211_auth_challenge(struct net_device *dev,
 920                                      struct ieee80211_if_sta *ifsta,
 921                                      struct ieee80211_mgmt *mgmt,
 922                                      size_t len)
 923 {
 924         u8 *pos;
 925         struct ieee802_11_elems elems;
 926
 927         printk(KERN_DEBUG "%s: replying to auth challenge\n", dev->name);
 928         pos = mgmt->u.auth.variable;
 929         if (ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems)
 930             == ParseFailed) {
 931                 printk(KERN_DEBUG "%s: failed to parse Auth(challenge)\n",
 932                        dev->name);
 933                 return;
 934         }
 935         if (!elems.challenge) {
 936                 printk(KERN_DEBUG "%s: no challenge IE in shared key auth "
 937                        "frame\n", dev->name);
 938                 return;
 939         }
 940         ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
 941                             elems.challenge_len + 2, 1);
 942 }
 943
 944
 945 static void ieee80211_rx_mgmt_auth(struct net_device *dev,
 946                                    struct ieee80211_if_sta *ifsta,
 947                                    struct ieee80211_mgmt *mgmt,
 948                                    size_t len)
 949 {
 950         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 951         u16 auth_alg, auth_transaction, status_code;
 952         DECLARE_MAC_BUF(mac);
 953
 954         if (ifsta->state != IEEE80211_AUTHENTICATE &&
 955             sdata->type != IEEE80211_IF_TYPE_IBSS) {
 956                 printk(KERN_DEBUG "%s: authentication frame received from "
 957                        "%s, but not in authenticate state - ignored\n",
 958                        dev->name, print_mac(mac, mgmt->sa));
 959                 return;
 960         }
 961
 962         if (len < 24 + 6) {
 963                 printk(KERN_DEBUG "%s: too short (%zd) authentication frame "
 964                        "received from %s - ignored\n",
 965                        dev->name, len, print_mac(mac, mgmt->sa));
 966                 return;
 967         }
 968
 969         if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
 970             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
 971                 printk(KERN_DEBUG "%s: authentication frame received from "
 972                        "unknown AP (SA=%s BSSID=%s) - "
 973                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
 974                        print_mac(mac, mgmt->bssid));
 975                 return;
 976         }
 977
 978         if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
 979             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) {
 980                 printk(KERN_DEBUG "%s: authentication frame received from "
 981                        "unknown BSSID (SA=%s BSSID=%s) - "
 982                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
 983                        print_mac(mac, mgmt->bssid));
 984                 return;
 985         }
 986
 987         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 988         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 989         status_code = le16_to_cpu(mgmt->u.auth.status_code);
 990
 991         printk(KERN_DEBUG "%s: RX authentication from %s (alg=%d "
 992                "transaction=%d status=%d)\n",
 993                dev->name, print_mac(mac, mgmt->sa), auth_alg,
 994                auth_transaction, status_code);
 995
 996         if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
 997                 /* IEEE 802.11 standard does not require authentication in IBSS
 998                  * networks and most implementations do not seem to use it.
 999                  * However, try to reply to authentication attempts if someone
1000                  * has actually implemented this.
1001                  * TODO: Could implement shared key authentication. */
1002                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) {
1003                         printk(KERN_DEBUG "%s: unexpected IBSS authentication "
1004                                "frame (alg=%d transaction=%d)\n",
1005                                dev->name, auth_alg, auth_transaction);
1006                         return;
1007                 }
1008                 ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
1009         }
1010
1011         if (auth_alg != ifsta->auth_alg ||
1012             auth_transaction != ifsta->auth_transaction) {
1013                 printk(KERN_DEBUG "%s: unexpected authentication frame "
1014                        "(alg=%d transaction=%d)\n",
1015                        dev->name, auth_alg, auth_transaction);
1016                 return;
1017         }
1018
1019         if (status_code != WLAN_STATUS_SUCCESS) {
1020                 printk(KERN_DEBUG "%s: AP denied authentication (auth_alg=%d "
1021                        "code=%d)\n", dev->name, ifsta->auth_alg, status_code);
1022                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1023                         u8 algs[3];
1024                         const int num_algs = ARRAY_SIZE(algs);
1025                         int i, pos;
1026                         algs[0] = algs[1] = algs[2] = 0xff;
1027                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1028                                 algs[0] = WLAN_AUTH_OPEN;
1029                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1030                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1031                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1032                                 algs[2] = WLAN_AUTH_LEAP;
1033                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1034                                 pos = 0;
1035                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1036                                 pos = 1;
1037                         else
1038                                 pos = 2;
1039                         for (i = 0; i < num_algs; i++) {
1040                                 pos++;
1041                                 if (pos >= num_algs)
1042                                         pos = 0;
1043                                 if (algs[pos] == ifsta->auth_alg ||
1044                                     algs[pos] == 0xff)
1045                                         continue;
1046                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1047                                     !ieee80211_sta_wep_configured(dev))
1048                                         continue;
1049                                 ifsta->auth_alg = algs[pos];
1050                                 printk(KERN_DEBUG "%s: set auth_alg=%d for "
1051                                        "next try\n",
1052                                        dev->name, ifsta->auth_alg);
1053                                 break;
1054                         }
1055                 }
1056                 return;
1057         }
1058
1059         switch (ifsta->auth_alg) {
1060         case WLAN_AUTH_OPEN:
1061         case WLAN_AUTH_LEAP:
1062                 ieee80211_auth_completed(dev, ifsta);
1063                 break;
1064         case WLAN_AUTH_SHARED_KEY:
1065                 if (ifsta->auth_transaction == 4)
1066                         ieee80211_auth_completed(dev, ifsta);
1067                 else
1068                         ieee80211_auth_challenge(dev, ifsta, mgmt, len);
1069                 break;
1070         }
1071 }
1072
1073
1074 static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
1075                                      struct ieee80211_if_sta *ifsta,
1076                                      struct ieee80211_mgmt *mgmt,
1077                                      size_t len)
1078 {
1079         u16 reason_code;
1080         DECLARE_MAC_BUF(mac);
1081
1082         if (len < 24 + 2) {
1083                 printk(KERN_DEBUG "%s: too short (%zd) deauthentication frame "
1084                        "received from %s - ignored\n",
1085                        dev->name, len, print_mac(mac, mgmt->sa));
1086                 return;
1087         }
1088
1089         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1090                 printk(KERN_DEBUG "%s: deauthentication frame received from "
1091                        "unknown AP (SA=%s BSSID=%s) - "
1092                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1093                        print_mac(mac, mgmt->bssid));
1094                 return;
1095         }
1096
1097         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1098
1099         printk(KERN_DEBUG "%s: RX deauthentication from %s"
1100                " (reason=%d)\n",
1101                dev->name, print_mac(mac, mgmt->sa), reason_code);
1102
1103         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED) {
1104                 printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
1105         }
1106
1107         if (ifsta->state == IEEE80211_AUTHENTICATE ||
1108             ifsta->state == IEEE80211_ASSOCIATE ||
1109             ifsta->state == IEEE80211_ASSOCIATED) {
1110                 ifsta->state = IEEE80211_AUTHENTICATE;
1111                 mod_timer(&ifsta->timer, jiffies +
1112                                       IEEE80211_RETRY_AUTH_INTERVAL);
1113         }
1114
1115         ieee80211_set_disassoc(dev, ifsta, 1);
1116         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1117 }
1118
1119
1120 static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
1121                                        struct ieee80211_if_sta *ifsta,
1122                                        struct ieee80211_mgmt *mgmt,
1123                                        size_t len)
1124 {
1125         u16 reason_code;
1126         DECLARE_MAC_BUF(mac);
1127
1128         if (len < 24 + 2) {
1129                 printk(KERN_DEBUG "%s: too short (%zd) disassociation frame "
1130                        "received from %s - ignored\n",
1131                        dev->name, len, print_mac(mac, mgmt->sa));
1132                 return;
1133         }
1134
1135         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1136                 printk(KERN_DEBUG "%s: disassociation frame received from "
1137                        "unknown AP (SA=%s BSSID=%s) - "
1138                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1139                        print_mac(mac, mgmt->bssid));
1140                 return;
1141         }
1142
1143         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1144
1145         printk(KERN_DEBUG "%s: RX disassociation from %s"
1146                " (reason=%d)\n",
1147                dev->name, print_mac(mac, mgmt->sa), reason_code);
1148
1149         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1150                 printk(KERN_DEBUG "%s: disassociated\n", dev->name);
1151
1152         if (ifsta->state == IEEE80211_ASSOCIATED) {
1153                 ifsta->state = IEEE80211_ASSOCIATE;
1154                 mod_timer(&ifsta->timer, jiffies +
1155                                       IEEE80211_RETRY_AUTH_INTERVAL);
1156         }
1157
1158         ieee80211_set_disassoc(dev, ifsta, 0);
1159 }
1160
1161
1162 static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
1163                                          struct ieee80211_if_sta *ifsta,
1164                                          struct ieee80211_mgmt *mgmt,
1165                                          size_t len,
1166                                          int reassoc)
1167 {
1168         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1169         struct ieee80211_hw_mode *mode;
1170         struct sta_info *sta;
1171         u32 rates;
1172         u16 capab_info, status_code, aid;
1173         struct ieee802_11_elems elems;
1174         u8 *pos;
1175         int i, j;
1176         DECLARE_MAC_BUF(mac);
1177
1178         /* AssocResp and ReassocResp have identical structure, so process both
1179          * of them in this function. */
1180
1181         if (ifsta->state != IEEE80211_ASSOCIATE) {
1182                 printk(KERN_DEBUG "%s: association frame received from "
1183                        "%s, but not in associate state - ignored\n",
1184                        dev->name, print_mac(mac, mgmt->sa));
1185                 return;
1186         }
1187
1188         if (len < 24 + 6) {
1189                 printk(KERN_DEBUG "%s: too short (%zd) association frame "
1190                        "received from %s - ignored\n",
1191                        dev->name, len, print_mac(mac, mgmt->sa));
1192                 return;
1193         }
1194
1195         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1196                 printk(KERN_DEBUG "%s: association frame received from "
1197                        "unknown AP (SA=%s BSSID=%s) - "
1198                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1199                        print_mac(mac, mgmt->bssid));
1200                 return;
1201         }
1202
1203         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1204         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1205         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1206
1207         printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
1208                "status=%d aid=%d)\n",
1209                dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
1210                capab_info, status_code, aid & ~(BIT(15) | BIT(14)));
1211
1212         if (status_code != WLAN_STATUS_SUCCESS) {
1213                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1214                        dev->name, status_code);
1215                 /* if this was a reassociation, ensure we try a "full"
1216                  * association next time. This works around some broken APs
1217                  * which do not correctly reject reassociation requests. */
1218                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1219                 return;
1220         }
1221
1222         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1223                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1224                        "set\n", dev->name, aid);
1225         aid &= ~(BIT(15) | BIT(14));
1226
1227         pos = mgmt->u.assoc_resp.variable;
1228         if (ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems)
1229             == ParseFailed) {
1230                 printk(KERN_DEBUG "%s: failed to parse AssocResp\n",
1231                        dev->name);
1232                 return;
1233         }
1234
1235         if (!elems.supp_rates) {
1236                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1237                        dev->name);
1238                 return;
1239         }
1240
1241         /* it probably doesn't, but if the frame includes an ERP value then
1242          * update our stored copy */
1243         if (elems.erp_info && elems.erp_info_len >= 1) {
1244                 struct ieee80211_sta_bss *bss
1245                         = ieee80211_rx_bss_get(dev, ifsta->bssid);
1246                 if (bss) {
1247                         bss->erp_value = elems.erp_info[0];
1248                         bss->has_erp_value = 1;
1249                         ieee80211_rx_bss_put(dev, bss);
1250                 }
1251         }
1252
1253         printk(KERN_DEBUG "%s: associated\n", dev->name);
1254         ifsta->aid = aid;
1255         ifsta->ap_capab = capab_info;
1256
1257         kfree(ifsta->assocresp_ies);
1258         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1259         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1260         if (ifsta->assocresp_ies)
1261                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1262
1263         ieee80211_set_associated(dev, ifsta, 1);
1264
1265         /* Add STA entry for the AP */
1266         sta = sta_info_get(local, ifsta->bssid);
1267         if (!sta) {
1268                 struct ieee80211_sta_bss *bss;
1269                 sta = sta_info_add(local, dev, ifsta->bssid, GFP_KERNEL);
1270                 if (!sta) {
1271                         printk(KERN_DEBUG "%s: failed to add STA entry for the"
1272                                " AP\n", dev->name);
1273                         return;
1274                 }
1275                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
1276                 if (bss) {
1277                         sta->last_rssi = bss->rssi;
1278                         sta->last_signal = bss->signal;
1279                         sta->last_noise = bss->noise;
1280                         ieee80211_rx_bss_put(dev, bss);
1281                 }
1282         }
1283
1284         sta->dev = dev;
1285         sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP;
1286
1287         rates = 0;
1288         mode = local->oper_hw_mode;
1289         for (i = 0; i < elems.supp_rates_len; i++) {
1290                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1291                 for (j = 0; j < mode->num_rates; j++)
1292                         if (mode->rates[j].rate == rate)
1293                                 rates |= BIT(j);
1294         }
1295         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1296                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1297                 for (j = 0; j < mode->num_rates; j++)
1298                         if (mode->rates[j].rate == rate)
1299                                 rates |= BIT(j);
1300         }
1301         sta->supp_rates = rates;
1302
1303         rate_control_rate_init(sta, local);
1304
1305         if (elems.wmm_param && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1306                 sta->flags |= WLAN_STA_WME;
1307                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1308                                          elems.wmm_param_len);
1309         }
1310
1311
1312         sta_info_put(sta);
1313
1314         ieee80211_associated(dev, ifsta);
1315 }
1316
1317
1318 /* Caller must hold local->sta_bss_lock */
1319 static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
1320                                         struct ieee80211_sta_bss *bss)
1321 {
1322         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1323         bss->hnext = local->sta_bss_hash[STA_HASH(bss->bssid)];
1324         local->sta_bss_hash[STA_HASH(bss->bssid)] = bss;
1325 }
1326
1327
1328 /* Caller must hold local->sta_bss_lock */
1329 static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
1330                                         struct ieee80211_sta_bss *bss)
1331 {
1332         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1333         struct ieee80211_sta_bss *b, *prev = NULL;
1334         b = local->sta_bss_hash[STA_HASH(bss->bssid)];
1335         while (b) {
1336                 if (b == bss) {
1337                         if (!prev)
1338                                 local->sta_bss_hash[STA_HASH(bss->bssid)] =
1339                                         bss->hnext;
1340                         else
1341                                 prev->hnext = bss->hnext;
1342                         break;
1343                 }
1344                 prev = b;
1345                 b = b->hnext;
1346         }
1347 }
1348
1349
1350 static struct ieee80211_sta_bss *
1351 ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid)
1352 {
1353         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1354         struct ieee80211_sta_bss *bss;
1355
1356         bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
1357         if (!bss)
1358                 return NULL;
1359         atomic_inc(&bss->users);
1360         atomic_inc(&bss->users);
1361         memcpy(bss->bssid, bssid, ETH_ALEN);
1362
1363         spin_lock_bh(&local->sta_bss_lock);
1364         /* TODO: order by RSSI? */
1365         list_add_tail(&bss->list, &local->sta_bss_list);
1366         __ieee80211_rx_bss_hash_add(dev, bss);
1367         spin_unlock_bh(&local->sta_bss_lock);
1368         return bss;
1369 }
1370
1371
1372 static struct ieee80211_sta_bss *
1373 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid)
1374 {
1375         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1376         struct ieee80211_sta_bss *bss;
1377
1378         spin_lock_bh(&local->sta_bss_lock);
1379         bss = local->sta_bss_hash[STA_HASH(bssid)];
1380         while (bss) {
1381                 if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0) {
1382                         atomic_inc(&bss->users);
1383                         break;
1384                 }
1385                 bss = bss->hnext;
1386         }
1387         spin_unlock_bh(&local->sta_bss_lock);
1388         return bss;
1389 }
1390
1391
1392 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
1393 {
1394         kfree(bss->wpa_ie);
1395         kfree(bss->rsn_ie);
1396         kfree(bss->wmm_ie);
1397         kfree(bss);
1398 }
1399
1400
1401 static void ieee80211_rx_bss_put(struct net_device *dev,
1402                                  struct ieee80211_sta_bss *bss)
1403 {
1404         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1405         if (!atomic_dec_and_test(&bss->users))
1406                 return;
1407
1408         spin_lock_bh(&local->sta_bss_lock);
1409         __ieee80211_rx_bss_hash_del(dev, bss);
1410         list_del(&bss->list);
1411         spin_unlock_bh(&local->sta_bss_lock);
1412         ieee80211_rx_bss_free(bss);
1413 }
1414
1415
1416 void ieee80211_rx_bss_list_init(struct net_device *dev)
1417 {
1418         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1419         spin_lock_init(&local->sta_bss_lock);
1420         INIT_LIST_HEAD(&local->sta_bss_list);
1421 }
1422
1423
1424 void ieee80211_rx_bss_list_deinit(struct net_device *dev)
1425 {
1426         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1427         struct ieee80211_sta_bss *bss, *tmp;
1428
1429         list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
1430                 ieee80211_rx_bss_put(dev, bss);
1431 }
1432
1433
1434 static void ieee80211_rx_bss_info(struct net_device *dev,
1435                                   struct ieee80211_mgmt *mgmt,
1436                                   size_t len,
1437                                   struct ieee80211_rx_status *rx_status,
1438                                   int beacon)
1439 {
1440         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1441         struct ieee802_11_elems elems;
1442         size_t baselen;
1443         int channel, invalid = 0, clen;
1444         struct ieee80211_sta_bss *bss;
1445         struct sta_info *sta;
1446         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1447         u64 timestamp;
1448         DECLARE_MAC_BUF(mac);
1449         DECLARE_MAC_BUF(mac2);
1450
1451         if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
1452                 return; /* ignore ProbeResp to foreign address */
1453
1454 #if 0
1455         printk(KERN_DEBUG "%s: RX %s from %s to %s\n",
1456                dev->name, beacon ? "Beacon" : "Probe Response",
1457                print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da));
1458 #endif
1459
1460         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1461         if (baselen > len)
1462                 return;
1463
1464         timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1465
1466         if (sdata->type == IEEE80211_IF_TYPE_IBSS && beacon &&
1467             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1468 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1469                 static unsigned long last_tsf_debug = 0;
1470                 u64 tsf;
1471                 if (local->ops->get_tsf)
1472                         tsf = local->ops->get_tsf(local_to_hw(local));
1473                 else
1474                         tsf = -1LLU;
1475                 if (time_after(jiffies, last_tsf_debug + 5 * HZ)) {
1476                         printk(KERN_DEBUG "RX beacon SA=%s BSSID="
1477                                "%s TSF=0x%llx BCN=0x%llx diff=%lld "
1478                                "@%lu\n",
1479                                print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->bssid),
1480                                (unsigned long long)tsf,
1481                                (unsigned long long)timestamp,
1482                                (unsigned long long)(tsf - timestamp),
1483                                jiffies);
1484                         last_tsf_debug = jiffies;
1485                 }
1486 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1487         }
1488
1489         if (ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen,
1490                                    &elems) == ParseFailed)
1491                 invalid = 1;
1492
1493         if (sdata->type == IEEE80211_IF_TYPE_IBSS && elems.supp_rates &&
1494             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
1495             (sta = sta_info_get(local, mgmt->sa))) {
1496                 struct ieee80211_hw_mode *mode;
1497                 struct ieee80211_rate *rates;
1498                 size_t num_rates;
1499                 u32 supp_rates, prev_rates;
1500                 int i, j;
1501
1502                 mode = local->sta_scanning ?
1503                        local->scan_hw_mode : local->oper_hw_mode;
1504                 rates = mode->rates;
1505                 num_rates = mode->num_rates;
1506
1507                 supp_rates = 0;
1508                 for (i = 0; i < elems.supp_rates_len +
1509                              elems.ext_supp_rates_len; i++) {
1510                         u8 rate = 0;
1511                         int own_rate;
1512                         if (i < elems.supp_rates_len)
1513                                 rate = elems.supp_rates[i];
1514                         else if (elems.ext_supp_rates)
1515                                 rate = elems.ext_supp_rates
1516                                         [i - elems.supp_rates_len];
1517                         own_rate = 5 * (rate & 0x7f);
1518                         for (j = 0; j < num_rates; j++)
1519                                 if (rates[j].rate == own_rate)
1520                                         supp_rates |= BIT(j);
1521                 }
1522
1523                 prev_rates = sta->supp_rates;
1524                 sta->supp_rates &= supp_rates;
1525                 if (sta->supp_rates == 0) {
1526                         /* No matching rates - this should not really happen.
1527                          * Make sure that at least one rate is marked
1528                          * supported to avoid issues with TX rate ctrl. */
1529                         sta->supp_rates = sdata->u.sta.supp_rates_bits;
1530                 }
1531                 if (sta->supp_rates != prev_rates) {
1532                         printk(KERN_DEBUG "%s: updated supp_rates set for "
1533                                "%s based on beacon info (0x%x & 0x%x -> "
1534                                "0x%x)\n",
1535                                dev->name, print_mac(mac, sta->addr), prev_rates,
1536                                supp_rates, sta->supp_rates);
1537                 }
1538                 sta_info_put(sta);
1539         }
1540
1541         if (!elems.ssid)
1542                 return;
1543
1544         if (elems.ds_params && elems.ds_params_len == 1)
1545                 channel = elems.ds_params[0];
1546         else
1547                 channel = rx_status->channel;
1548
1549         bss = ieee80211_rx_bss_get(dev, mgmt->bssid);
1550         if (!bss) {
1551                 bss = ieee80211_rx_bss_add(dev, mgmt->bssid);
1552                 if (!bss)
1553                         return;
1554         } else {
1555 #if 0
1556                 /* TODO: order by RSSI? */
1557                 spin_lock_bh(&local->sta_bss_lock);
1558                 list_move_tail(&bss->list, &local->sta_bss_list);
1559                 spin_unlock_bh(&local->sta_bss_lock);
1560 #endif
1561         }
1562
1563         if (bss->probe_resp && beacon) {
1564                 /* Do not allow beacon to override data from Probe Response. */
1565                 ieee80211_rx_bss_put(dev, bss);
1566                 return;
1567         }
1568
1569         /* save the ERP value so that it is available at association time */
1570         if (elems.erp_info && elems.erp_info_len >= 1) {
1571                 bss->erp_value = elems.erp_info[0];
1572                 bss->has_erp_value = 1;
1573         }
1574
1575         bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
1576         bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
1577         if (elems.ssid && elems.ssid_len <= IEEE80211_MAX_SSID_LEN) {
1578                 memcpy(bss->ssid, elems.ssid, elems.ssid_len);
1579                 bss->ssid_len = elems.ssid_len;
1580         }
1581
1582         bss->supp_rates_len = 0;
1583         if (elems.supp_rates) {
1584                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1585                 if (clen > elems.supp_rates_len)
1586                         clen = elems.supp_rates_len;
1587                 memcpy(&bss->supp_rates[bss->supp_rates_len], elems.supp_rates,
1588                        clen);
1589                 bss->supp_rates_len += clen;
1590         }
1591         if (elems.ext_supp_rates) {
1592                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1593                 if (clen > elems.ext_supp_rates_len)
1594                         clen = elems.ext_supp_rates_len;
1595                 memcpy(&bss->supp_rates[bss->supp_rates_len],
1596                        elems.ext_supp_rates, clen);
1597                 bss->supp_rates_len += clen;
1598         }
1599
1600         if (elems.wpa &&
1601             (!bss->wpa_ie || bss->wpa_ie_len != elems.wpa_len ||
1602              memcmp(bss->wpa_ie, elems.wpa, elems.wpa_len))) {
1603                 kfree(bss->wpa_ie);
1604                 bss->wpa_ie = kmalloc(elems.wpa_len + 2, GFP_ATOMIC);
1605                 if (bss->wpa_ie) {
1606                         memcpy(bss->wpa_ie, elems.wpa - 2, elems.wpa_len + 2);
1607                         bss->wpa_ie_len = elems.wpa_len + 2;
1608                 } else
1609                         bss->wpa_ie_len = 0;
1610         } else if (!elems.wpa && bss->wpa_ie) {
1611                 kfree(bss->wpa_ie);
1612                 bss->wpa_ie = NULL;
1613                 bss->wpa_ie_len = 0;
1614         }
1615
1616         if (elems.rsn &&
1617             (!bss->rsn_ie || bss->rsn_ie_len != elems.rsn_len ||
1618              memcmp(bss->rsn_ie, elems.rsn, elems.rsn_len))) {
1619                 kfree(bss->rsn_ie);
1620                 bss->rsn_ie = kmalloc(elems.rsn_len + 2, GFP_ATOMIC);
1621                 if (bss->rsn_ie) {
1622                         memcpy(bss->rsn_ie, elems.rsn - 2, elems.rsn_len + 2);
1623                         bss->rsn_ie_len = elems.rsn_len + 2;
1624                 } else
1625                         bss->rsn_ie_len = 0;
1626         } else if (!elems.rsn && bss->rsn_ie) {
1627                 kfree(bss->rsn_ie);
1628                 bss->rsn_ie = NULL;
1629                 bss->rsn_ie_len = 0;
1630         }
1631
1632         if (elems.wmm_param &&
1633             (!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_param_len ||
1634              memcmp(bss->wmm_ie, elems.wmm_param, elems.wmm_param_len))) {
1635                 kfree(bss->wmm_ie);
1636                 bss->wmm_ie = kmalloc(elems.wmm_param_len + 2, GFP_ATOMIC);
1637                 if (bss->wmm_ie) {
1638                         memcpy(bss->wmm_ie, elems.wmm_param - 2,
1639                                elems.wmm_param_len + 2);
1640                         bss->wmm_ie_len = elems.wmm_param_len + 2;
1641                 } else
1642                         bss->wmm_ie_len = 0;
1643         } else if (!elems.wmm_param && bss->wmm_ie) {
1644                 kfree(bss->wmm_ie);
1645                 bss->wmm_ie = NULL;
1646                 bss->wmm_ie_len = 0;
1647         }
1648
1649
1650         bss->hw_mode = rx_status->phymode;
1651         bss->channel = channel;
1652         bss->freq = rx_status->freq;
1653         if (channel != rx_status->channel &&
1654             (bss->hw_mode == MODE_IEEE80211G ||
1655              bss->hw_mode == MODE_IEEE80211B) &&
1656             channel >= 1 && channel <= 14) {
1657                 static const int freq_list[] = {
1658                         2412, 2417, 2422, 2427, 2432, 2437, 2442,
1659                         2447, 2452, 2457, 2462, 2467, 2472, 2484
1660                 };
1661                 /* IEEE 802.11g/b mode can receive packets from neighboring
1662                  * channels, so map the channel into frequency. */
1663                 bss->freq = freq_list[channel - 1];
1664         }
1665         bss->timestamp = timestamp;
1666         bss->last_update = jiffies;
1667         bss->rssi = rx_status->ssi;
1668         bss->signal = rx_status->signal;
1669         bss->noise = rx_status->noise;
1670         if (!beacon)
1671                 bss->probe_resp++;
1672         ieee80211_rx_bss_put(dev, bss);
1673 }
1674
1675
1676 static void ieee80211_rx_mgmt_probe_resp(struct net_device *dev,
1677                                          struct ieee80211_mgmt *mgmt,
1678                                          size_t len,
1679                                          struct ieee80211_rx_status *rx_status)
1680 {
1681         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 0);
1682 }
1683
1684
1685 static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
1686                                      struct ieee80211_mgmt *mgmt,
1687                                      size_t len,
1688                                      struct ieee80211_rx_status *rx_status)
1689 {
1690         struct ieee80211_sub_if_data *sdata;
1691         struct ieee80211_if_sta *ifsta;
1692         size_t baselen;
1693         struct ieee802_11_elems elems;
1694
1695         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 1);
1696
1697         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1698         if (sdata->type != IEEE80211_IF_TYPE_STA)
1699                 return;
1700         ifsta = &sdata->u.sta;
1701
1702         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1703             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1704                 return;
1705
1706         /* Process beacon from the current BSS */
1707         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1708         if (baselen > len)
1709                 return;
1710
1711         if (ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen,
1712                                    &elems) == ParseFailed)
1713                 return;
1714
1715         if (elems.erp_info && elems.erp_info_len >= 1)
1716                 ieee80211_handle_erp_ie(dev, elems.erp_info[0]);
1717
1718         if (elems.wmm_param && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1719                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1720                                          elems.wmm_param_len);
1721         }
1722 }
1723
1724
1725 static void ieee80211_rx_mgmt_probe_req(struct net_device *dev,
1726                                         struct ieee80211_if_sta *ifsta,
1727                                         struct ieee80211_mgmt *mgmt,
1728                                         size_t len,
1729                                         struct ieee80211_rx_status *rx_status)
1730 {
1731         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1732         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1733         int tx_last_beacon;
1734         struct sk_buff *skb;
1735         struct ieee80211_mgmt *resp;
1736         u8 *pos, *end;
1737         DECLARE_MAC_BUF(mac);
1738 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1739         DECLARE_MAC_BUF(mac2);
1740         DECLARE_MAC_BUF(mac3);
1741 #endif
1742
1743         if (sdata->type != IEEE80211_IF_TYPE_IBSS ||
1744             ifsta->state != IEEE80211_IBSS_JOINED ||
1745             len < 24 + 2 || !ifsta->probe_resp)
1746                 return;
1747
1748         if (local->ops->tx_last_beacon)
1749                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1750         else
1751                 tx_last_beacon = 1;
1752
1753 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1754         printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
1755                "%s (tx_last_beacon=%d)\n",
1756                dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
1757                print_mac(mac3, mgmt->bssid), tx_last_beacon);
1758 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1759
1760         if (!tx_last_beacon)
1761                 return;
1762
1763         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1764             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1765                 return;
1766
1767         end = ((u8 *) mgmt) + len;
1768         pos = mgmt->u.probe_req.variable;
1769         if (pos[0] != WLAN_EID_SSID ||
1770             pos + 2 + pos[1] > end) {
1771                 if (net_ratelimit()) {
1772                         printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1773                                "from %s\n",
1774                                dev->name, print_mac(mac, mgmt->sa));
1775                 }
1776                 return;
1777         }
1778         if (pos[1] != 0 &&
1779             (pos[1] != ifsta->ssid_len ||
1780              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1781                 /* Ignore ProbeReq for foreign SSID */
1782                 return;
1783         }
1784
1785         /* Reply with ProbeResp */
1786         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1787         if (!skb)
1788                 return;
1789
1790         resp = (struct ieee80211_mgmt *) skb->data;
1791         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1792 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1793         printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
1794                dev->name, print_mac(mac, resp->da));
1795 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1796         ieee80211_sta_tx(dev, skb, 0);
1797 }
1798
1799
1800 void ieee80211_sta_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
1801                            struct ieee80211_rx_status *rx_status)
1802 {
1803         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1804         struct ieee80211_sub_if_data *sdata;
1805         struct ieee80211_if_sta *ifsta;
1806         struct ieee80211_mgmt *mgmt;
1807         u16 fc;
1808
1809         if (skb->len < 24)
1810                 goto fail;
1811
1812         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1813         ifsta = &sdata->u.sta;
1814
1815         mgmt = (struct ieee80211_mgmt *) skb->data;
1816         fc = le16_to_cpu(mgmt->frame_control);
1817
1818         switch (fc & IEEE80211_FCTL_STYPE) {
1819         case IEEE80211_STYPE_PROBE_REQ:
1820         case IEEE80211_STYPE_PROBE_RESP:
1821         case IEEE80211_STYPE_BEACON:
1822                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1823         case IEEE80211_STYPE_AUTH:
1824         case IEEE80211_STYPE_ASSOC_RESP:
1825         case IEEE80211_STYPE_REASSOC_RESP:
1826         case IEEE80211_STYPE_DEAUTH:
1827         case IEEE80211_STYPE_DISASSOC:
1828                 skb_queue_tail(&ifsta->skb_queue, skb);
1829                 queue_work(local->hw.workqueue, &ifsta->work);
1830                 return;
1831         default:
1832                 printk(KERN_DEBUG "%s: received unknown management frame - "
1833                        "stype=%d\n", dev->name,
1834                        (fc & IEEE80211_FCTL_STYPE) >> 4);
1835                 break;
1836         }
1837
1838  fail:
1839         kfree_skb(skb);
1840 }
1841
1842
1843 static void ieee80211_sta_rx_queued_mgmt(struct net_device *dev,
1844                                          struct sk_buff *skb)
1845 {
1846         struct ieee80211_rx_status *rx_status;
1847         struct ieee80211_sub_if_data *sdata;
1848         struct ieee80211_if_sta *ifsta;
1849         struct ieee80211_mgmt *mgmt;
1850         u16 fc;
1851
1852         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1853         ifsta = &sdata->u.sta;
1854
1855         rx_status = (struct ieee80211_rx_status *) skb->cb;
1856         mgmt = (struct ieee80211_mgmt *) skb->data;
1857         fc = le16_to_cpu(mgmt->frame_control);
1858
1859         switch (fc & IEEE80211_FCTL_STYPE) {
1860         case IEEE80211_STYPE_PROBE_REQ:
1861                 ieee80211_rx_mgmt_probe_req(dev, ifsta, mgmt, skb->len,
1862                                             rx_status);
1863                 break;
1864         case IEEE80211_STYPE_PROBE_RESP:
1865                 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
1866                 break;
1867         case IEEE80211_STYPE_BEACON:
1868                 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
1869                 break;
1870         case IEEE80211_STYPE_AUTH:
1871                 ieee80211_rx_mgmt_auth(dev, ifsta, mgmt, skb->len);
1872                 break;
1873         case IEEE80211_STYPE_ASSOC_RESP:
1874                 ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len, 0);
1875                 break;
1876         case IEEE80211_STYPE_REASSOC_RESP:
1877                 ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len, 1);
1878                 break;
1879         case IEEE80211_STYPE_DEAUTH:
1880                 ieee80211_rx_mgmt_deauth(dev, ifsta, mgmt, skb->len);
1881                 break;
1882         case IEEE80211_STYPE_DISASSOC:
1883                 ieee80211_rx_mgmt_disassoc(dev, ifsta, mgmt, skb->len);
1884                 break;
1885         }
1886
1887         kfree_skb(skb);
1888 }
1889
1890
1891 void ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
1892                            struct ieee80211_rx_status *rx_status)
1893 {
1894         struct ieee80211_mgmt *mgmt;
1895         u16 fc;
1896
1897         if (skb->len < 24) {
1898                 dev_kfree_skb(skb);
1899                 return;
1900         }
1901
1902         mgmt = (struct ieee80211_mgmt *) skb->data;
1903         fc = le16_to_cpu(mgmt->frame_control);
1904
1905         if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) {
1906                 if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP) {
1907                         ieee80211_rx_mgmt_probe_resp(dev, mgmt,
1908                                                      skb->len, rx_status);
1909                 } else if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
1910                         ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len,
1911                                                  rx_status);
1912                 }
1913         }
1914
1915         dev_kfree_skb(skb);
1916 }
1917
1918
1919 static int ieee80211_sta_active_ibss(struct net_device *dev)
1920 {
1921         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1922         int active = 0;
1923         struct sta_info *sta;
1924
1925         read_lock_bh(&local->sta_lock);
1926         list_for_each_entry(sta, &local->sta_list, list) {
1927                 if (sta->dev == dev &&
1928                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1929                                jiffies)) {
1930                         active++;
1931                         break;
1932                 }
1933         }
1934         read_unlock_bh(&local->sta_lock);
1935
1936         return active;
1937 }
1938
1939
1940 static void ieee80211_sta_expire(struct net_device *dev)
1941 {
1942         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1943         struct sta_info *sta, *tmp;
1944         LIST_HEAD(tmp_list);
1945         DECLARE_MAC_BUF(mac);
1946
1947         write_lock_bh(&local->sta_lock);
1948         list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
1949                 if (time_after(jiffies, sta->last_rx +
1950                                IEEE80211_IBSS_INACTIVITY_LIMIT)) {
1951                         printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
1952                                dev->name, print_mac(mac, sta->addr));
1953                         __sta_info_get(sta);
1954                         sta_info_remove(sta);
1955                         list_add(&sta->list, &tmp_list);
1956                 }
1957         write_unlock_bh(&local->sta_lock);
1958
1959         list_for_each_entry_safe(sta, tmp, &tmp_list, list) {
1960                 sta_info_free(sta);
1961                 sta_info_put(sta);
1962         }
1963 }
1964
1965
1966 static void ieee80211_sta_merge_ibss(struct net_device *dev,
1967                                      struct ieee80211_if_sta *ifsta)
1968 {
1969         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1970
1971         ieee80211_sta_expire(dev);
1972         if (ieee80211_sta_active_ibss(dev))
1973                 return;
1974
1975         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1976                "IBSS networks with same SSID (merge)\n", dev->name);
1977         ieee80211_sta_req_scan(dev, ifsta->ssid, ifsta->ssid_len);
1978 }
1979
1980
1981 void ieee80211_sta_timer(unsigned long data)
1982 {
1983         struct ieee80211_sub_if_data *sdata =
1984                 (struct ieee80211_sub_if_data *) data;
1985         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1986         struct ieee80211_local *local = wdev_priv(&sdata->wdev);
1987
1988         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1989         queue_work(local->hw.workqueue, &ifsta->work);
1990 }
1991
1992
1993 void ieee80211_sta_work(struct work_struct *work)
1994 {
1995         struct ieee80211_sub_if_data *sdata =
1996                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
1997         struct net_device *dev = sdata->dev;
1998         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1999         struct ieee80211_if_sta *ifsta;
2000         struct sk_buff *skb;
2001
2002         if (!netif_running(dev))
2003                 return;
2004
2005         if (local->sta_scanning)
2006                 return;
2007
2008         if (sdata->type != IEEE80211_IF_TYPE_STA &&
2009             sdata->type != IEEE80211_IF_TYPE_IBSS) {
2010                 printk(KERN_DEBUG "%s: ieee80211_sta_work: non-STA interface "
2011                        "(type=%d)\n", dev->name, sdata->type);
2012                 return;
2013         }
2014         ifsta = &sdata->u.sta;
2015
2016         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2017                 ieee80211_sta_rx_queued_mgmt(dev, skb);
2018
2019         if (ifsta->state != IEEE80211_AUTHENTICATE &&
2020             ifsta->state != IEEE80211_ASSOCIATE &&
2021             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2022                 ieee80211_sta_start_scan(dev, NULL, 0);
2023                 return;
2024         }
2025
2026         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2027                 if (ieee80211_sta_config_auth(dev, ifsta))
2028                         return;
2029                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2030         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2031                 return;
2032
2033         switch (ifsta->state) {
2034         case IEEE80211_DISABLED:
2035                 break;
2036         case IEEE80211_AUTHENTICATE:
2037                 ieee80211_authenticate(dev, ifsta);
2038                 break;
2039         case IEEE80211_ASSOCIATE:
2040                 ieee80211_associate(dev, ifsta);
2041                 break;
2042         case IEEE80211_ASSOCIATED:
2043                 ieee80211_associated(dev, ifsta);
2044                 break;
2045         case IEEE80211_IBSS_SEARCH:
2046                 ieee80211_sta_find_ibss(dev, ifsta);
2047                 break;
2048         case IEEE80211_IBSS_JOINED:
2049                 ieee80211_sta_merge_ibss(dev, ifsta);
2050                 break;
2051         default:
2052                 printk(KERN_DEBUG "ieee80211_sta_work: Unknown state %d\n",
2053                        ifsta->state);
2054                 break;
2055         }
2056
2057         if (ieee80211_privacy_mismatch(dev, ifsta)) {
2058                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2059                        "mixed-cell disabled - disassociate\n", dev->name);
2060
2061                 ieee80211_send_disassoc(dev, ifsta, WLAN_REASON_UNSPECIFIED);
2062                 ieee80211_set_disassoc(dev, ifsta, 0);
2063         }
2064 }
2065
2066
2067 static void ieee80211_sta_reset_auth(struct net_device *dev,
2068                                      struct ieee80211_if_sta *ifsta)
2069 {
2070         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2071
2072         if (local->ops->reset_tsf) {
2073                 /* Reset own TSF to allow time synchronization work. */
2074                 local->ops->reset_tsf(local_to_hw(local));
2075         }
2076
2077         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2078
2079
2080         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2081                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2082         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2083                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2084         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2085                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2086         else
2087                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2088         printk(KERN_DEBUG "%s: Initial auth_alg=%d\n", dev->name,
2089                ifsta->auth_alg);
2090         ifsta->auth_transaction = -1;
2091         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2092         ifsta->auth_tries = ifsta->assoc_tries = 0;
2093         netif_carrier_off(dev);
2094 }
2095
2096
2097 void ieee80211_sta_req_auth(struct net_device *dev,
2098                             struct ieee80211_if_sta *ifsta)
2099 {
2100         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2101         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2102
2103         if (sdata->type != IEEE80211_IF_TYPE_STA)
2104                 return;
2105
2106         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2107                                 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2108             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2109                                 IEEE80211_STA_AUTO_SSID_SEL))) {
2110                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2111                 queue_work(local->hw.workqueue, &ifsta->work);
2112         }
2113 }
2114
2115 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2116                                     const char *ssid, int ssid_len)
2117 {
2118         int tmp, hidden_ssid;
2119
2120         if (!memcmp(ifsta->ssid, ssid, ssid_len))
2121                 return 1;
2122
2123         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2124                 return 0;
2125
2126         hidden_ssid = 1;
2127         tmp = ssid_len;
2128         while (tmp--) {
2129                 if (ssid[tmp] != '\0') {
2130                         hidden_ssid = 0;
2131                         break;
2132                 }
2133         }
2134
2135         if (hidden_ssid && ifsta->ssid_len == ssid_len)
2136                 return 1;
2137
2138         if (ssid_len == 1 && ssid[0] == ' ')
2139                 return 1;
2140
2141         return 0;
2142 }
2143
2144 static int ieee80211_sta_config_auth(struct net_device *dev,
2145                                      struct ieee80211_if_sta *ifsta)
2146 {
2147         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2148         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2149         struct ieee80211_sta_bss *bss, *selected = NULL;
2150         int top_rssi = 0, freq;
2151
2152         if (!(ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2153             IEEE80211_STA_AUTO_BSSID_SEL | IEEE80211_STA_AUTO_CHANNEL_SEL))) {
2154                 ifsta->state = IEEE80211_AUTHENTICATE;
2155                 ieee80211_sta_reset_auth(dev, ifsta);
2156                 return 0;
2157         }
2158
2159         spin_lock_bh(&local->sta_bss_lock);
2160         freq = local->oper_channel->freq;
2161         list_for_each_entry(bss, &local->sta_bss_list, list) {
2162                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2163                         continue;
2164
2165                 if (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2166                     !!sdata->default_key)
2167                         continue;
2168
2169                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2170                     bss->freq != freq)
2171                         continue;
2172
2173                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2174                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2175                         continue;
2176
2177                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2178                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2179                         continue;
2180
2181                 if (!selected || top_rssi < bss->rssi) {
2182                         selected = bss;
2183                         top_rssi = bss->rssi;
2184                 }
2185         }
2186         if (selected)
2187                 atomic_inc(&selected->users);
2188         spin_unlock_bh(&local->sta_bss_lock);
2189
2190         if (selected) {
2191                 ieee80211_set_channel(local, -1, selected->freq);
2192                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2193                         ieee80211_sta_set_ssid(dev, selected->ssid,
2194                                                selected->ssid_len);
2195                 ieee80211_sta_set_bssid(dev, selected->bssid);
2196                 ieee80211_rx_bss_put(dev, selected);
2197                 ifsta->state = IEEE80211_AUTHENTICATE;
2198                 ieee80211_sta_reset_auth(dev, ifsta);
2199                 return 0;
2200         } else {
2201                 if (ifsta->state != IEEE80211_AUTHENTICATE) {
2202                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2203                                 ieee80211_sta_start_scan(dev, NULL, 0);
2204                         else
2205                                 ieee80211_sta_start_scan(dev, ifsta->ssid,
2206                                                          ifsta->ssid_len);
2207                         ifsta->state = IEEE80211_AUTHENTICATE;
2208                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2209                 } else
2210                         ifsta->state = IEEE80211_DISABLED;
2211         }
2212         return -1;
2213 }
2214
2215 static int ieee80211_sta_join_ibss(struct net_device *dev,
2216                                    struct ieee80211_if_sta *ifsta,
2217                                    struct ieee80211_sta_bss *bss)
2218 {
2219         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2220         int res, rates, i, j;
2221         struct sk_buff *skb;
2222         struct ieee80211_mgmt *mgmt;
2223         struct ieee80211_tx_control control;
2224         struct ieee80211_rate *rate;
2225         struct ieee80211_hw_mode *mode;
2226         struct rate_control_extra extra;
2227         u8 *pos;
2228         struct ieee80211_sub_if_data *sdata;
2229
2230         /* Remove possible STA entries from other IBSS networks. */
2231         sta_info_flush(local, NULL);
2232
2233         if (local->ops->reset_tsf) {
2234                 /* Reset own TSF to allow time synchronization work. */
2235                 local->ops->reset_tsf(local_to_hw(local));
2236         }
2237         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2238         res = ieee80211_if_config(dev);
2239         if (res)
2240                 return res;
2241
2242         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2243
2244         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2245         sdata->drop_unencrypted = bss->capability &
2246                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2247
2248         res = ieee80211_set_channel(local, -1, bss->freq);
2249
2250         if (!(local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)) {
2251                 printk(KERN_DEBUG "%s: IBSS not allowed on channel %d "
2252                        "(%d MHz)\n", dev->name, local->hw.conf.channel,
2253                        local->hw.conf.freq);
2254                 return -1;
2255         }
2256
2257         /* Set beacon template based on scan results */
2258         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2259         do {
2260                 if (!skb)
2261                         break;
2262
2263                 skb_reserve(skb, local->hw.extra_tx_headroom);
2264
2265                 mgmt = (struct ieee80211_mgmt *)
2266                         skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2267                 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2268                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2269                                                    IEEE80211_STYPE_BEACON);
2270                 memset(mgmt->da, 0xff, ETH_ALEN);
2271                 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
2272                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2273                 mgmt->u.beacon.beacon_int =
2274                         cpu_to_le16(local->hw.conf.beacon_int);
2275                 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2276
2277                 pos = skb_put(skb, 2 + ifsta->ssid_len);
2278                 *pos++ = WLAN_EID_SSID;
2279                 *pos++ = ifsta->ssid_len;
2280                 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2281
2282                 rates = bss->supp_rates_len;
2283                 if (rates > 8)
2284                         rates = 8;
2285                 pos = skb_put(skb, 2 + rates);
2286                 *pos++ = WLAN_EID_SUPP_RATES;
2287                 *pos++ = rates;
2288                 memcpy(pos, bss->supp_rates, rates);
2289
2290                 pos = skb_put(skb, 2 + 1);
2291                 *pos++ = WLAN_EID_DS_PARAMS;
2292                 *pos++ = 1;
2293                 *pos++ = bss->channel;
2294
2295                 pos = skb_put(skb, 2 + 2);
2296                 *pos++ = WLAN_EID_IBSS_PARAMS;
2297                 *pos++ = 2;
2298                 /* FIX: set ATIM window based on scan results */
2299                 *pos++ = 0;
2300                 *pos++ = 0;
2301
2302                 if (bss->supp_rates_len > 8) {
2303                         rates = bss->supp_rates_len - 8;
2304                         pos = skb_put(skb, 2 + rates);
2305                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
2306                         *pos++ = rates;
2307                         memcpy(pos, &bss->supp_rates[8], rates);
2308                 }
2309
2310                 memset(&control, 0, sizeof(control));
2311                 memset(&extra, 0, sizeof(extra));
2312                 extra.mode = local->oper_hw_mode;
2313                 rate = rate_control_get_rate(local, dev, skb, &extra);
2314                 if (!rate) {
2315                         printk(KERN_DEBUG "%s: Failed to determine TX rate "
2316                                "for IBSS beacon\n", dev->name);
2317                         break;
2318                 }
2319                 control.tx_rate =
2320                         ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
2321                         (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
2322                         rate->val2 : rate->val;
2323                 control.antenna_sel_tx = local->hw.conf.antenna_sel_tx;
2324                 control.power_level = local->hw.conf.power_level;
2325                 control.flags |= IEEE80211_TXCTL_NO_ACK;
2326                 control.retry_limit = 1;
2327
2328                 ifsta->probe_resp = skb_copy(skb, GFP_ATOMIC);
2329                 if (ifsta->probe_resp) {
2330                         mgmt = (struct ieee80211_mgmt *)
2331                                 ifsta->probe_resp->data;
2332                         mgmt->frame_control =
2333                                 IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2334                                              IEEE80211_STYPE_PROBE_RESP);
2335                 } else {
2336                         printk(KERN_DEBUG "%s: Could not allocate ProbeResp "
2337                                "template for IBSS\n", dev->name);
2338                 }
2339
2340                 if (local->ops->beacon_update &&
2341                     local->ops->beacon_update(local_to_hw(local),
2342                                              skb, &control) == 0) {
2343                         printk(KERN_DEBUG "%s: Configured IBSS beacon "
2344                                "template based on scan results\n", dev->name);
2345                         skb = NULL;
2346                 }
2347
2348                 rates = 0;
2349                 mode = local->oper_hw_mode;
2350                 for (i = 0; i < bss->supp_rates_len; i++) {
2351                         int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2352                         for (j = 0; j < mode->num_rates; j++)
2353                                 if (mode->rates[j].rate == bitrate)
2354                                         rates |= BIT(j);
2355                 }
2356                 ifsta->supp_rates_bits = rates;
2357         } while (0);
2358
2359         if (skb) {
2360                 printk(KERN_DEBUG "%s: Failed to configure IBSS beacon "
2361                        "template\n", dev->name);
2362                 dev_kfree_skb(skb);
2363         }
2364
2365         ifsta->state = IEEE80211_IBSS_JOINED;
2366         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2367
2368         ieee80211_rx_bss_put(dev, bss);
2369
2370         return res;
2371 }
2372
2373
2374 static int ieee80211_sta_create_ibss(struct net_device *dev,
2375                                      struct ieee80211_if_sta *ifsta)
2376 {
2377         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2378         struct ieee80211_sta_bss *bss;
2379         struct ieee80211_sub_if_data *sdata;
2380         struct ieee80211_hw_mode *mode;
2381         u8 bssid[ETH_ALEN], *pos;
2382         int i;
2383         DECLARE_MAC_BUF(mac);
2384
2385 #if 0
2386         /* Easier testing, use fixed BSSID. */
2387         memset(bssid, 0xfe, ETH_ALEN);
2388 #else
2389         /* Generate random, not broadcast, locally administered BSSID. Mix in
2390          * own MAC address to make sure that devices that do not have proper
2391          * random number generator get different BSSID. */
2392         get_random_bytes(bssid, ETH_ALEN);
2393         for (i = 0; i < ETH_ALEN; i++)
2394                 bssid[i] ^= dev->dev_addr[i];
2395         bssid[0] &= ~0x01;
2396         bssid[0] |= 0x02;
2397 #endif
2398
2399         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
2400                dev->name, print_mac(mac, bssid));
2401
2402         bss = ieee80211_rx_bss_add(dev, bssid);
2403         if (!bss)
2404                 return -ENOMEM;
2405
2406         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2407         mode = local->oper_hw_mode;
2408
2409         if (local->hw.conf.beacon_int == 0)
2410                 local->hw.conf.beacon_int = 100;
2411         bss->beacon_int = local->hw.conf.beacon_int;
2412         bss->hw_mode = local->hw.conf.phymode;
2413         bss->channel = local->hw.conf.channel;
2414         bss->freq = local->hw.conf.freq;
2415         bss->last_update = jiffies;
2416         bss->capability = WLAN_CAPABILITY_IBSS;
2417         if (sdata->default_key) {
2418                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2419         } else
2420                 sdata->drop_unencrypted = 0;
2421         bss->supp_rates_len = mode->num_rates;
2422         pos = bss->supp_rates;
2423         for (i = 0; i < mode->num_rates; i++) {
2424                 int rate = mode->rates[i].rate;
2425                 *pos++ = (u8) (rate / 5);
2426         }
2427
2428         return ieee80211_sta_join_ibss(dev, ifsta, bss);
2429 }
2430
2431
2432 static int ieee80211_sta_find_ibss(struct net_device *dev,
2433                                    struct ieee80211_if_sta *ifsta)
2434 {
2435         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2436         struct ieee80211_sta_bss *bss;
2437         int found = 0;
2438         u8 bssid[ETH_ALEN];
2439         int active_ibss;
2440         DECLARE_MAC_BUF(mac);
2441         DECLARE_MAC_BUF(mac2);
2442
2443         if (ifsta->ssid_len == 0)
2444                 return -EINVAL;
2445
2446         active_ibss = ieee80211_sta_active_ibss(dev);
2447 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2448         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2449                dev->name, active_ibss);
2450 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2451         spin_lock_bh(&local->sta_bss_lock);
2452         list_for_each_entry(bss, &local->sta_bss_list, list) {
2453                 if (ifsta->ssid_len != bss->ssid_len ||
2454                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2455                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2456                         continue;
2457 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2458                 printk(KERN_DEBUG "   bssid=%s found\n",
2459                        print_mac(mac, bss->bssid));
2460 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2461                 memcpy(bssid, bss->bssid, ETH_ALEN);
2462                 found = 1;
2463                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2464                         break;
2465         }
2466         spin_unlock_bh(&local->sta_bss_lock);
2467
2468 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2469         printk(KERN_DEBUG "   sta_find_ibss: selected %s current "
2470                "%s\n", print_mac(mac, bssid), print_mac(mac2, ifsta->bssid));
2471 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2472         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
2473             (bss = ieee80211_rx_bss_get(dev, bssid))) {
2474                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
2475                        " based on configured SSID\n",
2476                        dev->name, print_mac(mac, bssid));
2477                 return ieee80211_sta_join_ibss(dev, ifsta, bss);
2478         }
2479 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2480         printk(KERN_DEBUG "   did not try to join ibss\n");
2481 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2482
2483         /* Selected IBSS not found in current scan results - try to scan */
2484         if (ifsta->state == IEEE80211_IBSS_JOINED &&
2485             !ieee80211_sta_active_ibss(dev)) {
2486                 mod_timer(&ifsta->timer, jiffies +
2487                                       IEEE80211_IBSS_MERGE_INTERVAL);
2488         } else if (time_after(jiffies, local->last_scan_completed +
2489                               IEEE80211_SCAN_INTERVAL)) {
2490                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2491                        "join\n", dev->name);
2492                 return ieee80211_sta_req_scan(dev, ifsta->ssid,
2493                                               ifsta->ssid_len);
2494         } else if (ifsta->state != IEEE80211_IBSS_JOINED) {
2495                 int interval = IEEE80211_SCAN_INTERVAL;
2496
2497                 if (time_after(jiffies, ifsta->ibss_join_req +
2498                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2499                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2500                             local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)
2501                                 return ieee80211_sta_create_ibss(dev, ifsta);
2502                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2503                                 printk(KERN_DEBUG "%s: IBSS not allowed on the"
2504                                        " configured channel %d (%d MHz)\n",
2505                                        dev->name, local->hw.conf.channel,
2506                                        local->hw.conf.freq);
2507                         }
2508
2509                         /* No IBSS found - decrease scan interval and continue
2510                          * scanning. */
2511                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2512                 }
2513
2514                 ifsta->state = IEEE80211_IBSS_SEARCH;
2515                 mod_timer(&ifsta->timer, jiffies + interval);
2516                 return 0;
2517         }
2518
2519         return 0;
2520 }
2521
2522
2523 int ieee80211_sta_set_ssid(struct net_device *dev, char *ssid, size_t len)
2524 {
2525         struct ieee80211_sub_if_data *sdata;
2526         struct ieee80211_if_sta *ifsta;
2527         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2528
2529         if (len > IEEE80211_MAX_SSID_LEN)
2530                 return -EINVAL;
2531
2532         /* TODO: This should always be done for IBSS, even if IEEE80211_QOS is
2533          * not defined. */
2534         if (local->ops->conf_tx) {
2535                 struct ieee80211_tx_queue_params qparam;
2536                 int i;
2537
2538                 memset(&qparam, 0, sizeof(qparam));
2539                 /* TODO: are these ok defaults for all hw_modes? */
2540                 qparam.aifs = 2;
2541                 qparam.cw_min =
2542                         local->hw.conf.phymode == MODE_IEEE80211B ? 31 : 15;
2543                 qparam.cw_max = 1023;
2544                 qparam.burst_time = 0;
2545                 for (i = IEEE80211_TX_QUEUE_DATA0; i < NUM_TX_DATA_QUEUES; i++)
2546                 {
2547                         local->ops->conf_tx(local_to_hw(local),
2548                                            i + IEEE80211_TX_QUEUE_DATA0,
2549                                            &qparam);
2550                 }
2551                 /* IBSS uses different parameters for Beacon sending */
2552                 qparam.cw_min++;
2553                 qparam.cw_min *= 2;
2554                 qparam.cw_min--;
2555                 local->ops->conf_tx(local_to_hw(local),
2556                                    IEEE80211_TX_QUEUE_BEACON, &qparam);
2557         }
2558
2559         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2560         ifsta = &sdata->u.sta;
2561
2562         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0)
2563                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2564         memcpy(ifsta->ssid, ssid, len);
2565         memset(ifsta->ssid + len, 0, IEEE80211_MAX_SSID_LEN - len);
2566         ifsta->ssid_len = len;
2567
2568         if (len)
2569                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2570         else
2571                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2572         if (sdata->type == IEEE80211_IF_TYPE_IBSS &&
2573             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2574                 ifsta->ibss_join_req = jiffies;
2575                 ifsta->state = IEEE80211_IBSS_SEARCH;
2576                 return ieee80211_sta_find_ibss(dev, ifsta);
2577         }
2578         return 0;
2579 }
2580
2581
2582 int ieee80211_sta_get_ssid(struct net_device *dev, char *ssid, size_t *len)
2583 {
2584         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2585         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2586         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2587         *len = ifsta->ssid_len;
2588         return 0;
2589 }
2590
2591
2592 int ieee80211_sta_set_bssid(struct net_device *dev, u8 *bssid)
2593 {
2594         struct ieee80211_sub_if_data *sdata;
2595         struct ieee80211_if_sta *ifsta;
2596         int res;
2597
2598         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2599         ifsta = &sdata->u.sta;
2600
2601         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2602                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2603                 res = ieee80211_if_config(dev);
2604                 if (res) {
2605                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2606                                "the low-level driver\n", dev->name);
2607                         return res;
2608                 }
2609         }
2610
2611         if (is_valid_ether_addr(bssid))
2612                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2613         else
2614                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2615
2616         return 0;
2617 }
2618
2619
2620 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
2621                                     struct ieee80211_sub_if_data *sdata,
2622                                     int powersave)
2623 {
2624         struct sk_buff *skb;
2625         struct ieee80211_hdr *nullfunc;
2626         u16 fc;
2627
2628         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2629         if (!skb) {
2630                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2631                        "frame\n", sdata->dev->name);
2632                 return;
2633         }
2634         skb_reserve(skb, local->hw.extra_tx_headroom);
2635
2636         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2637         memset(nullfunc, 0, 24);
2638         fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2639              IEEE80211_FCTL_TODS;
2640         if (powersave)
2641                 fc |= IEEE80211_FCTL_PM;
2642         nullfunc->frame_control = cpu_to_le16(fc);
2643         memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
2644         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2645         memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
2646
2647         ieee80211_sta_tx(sdata->dev, skb, 0);
2648 }
2649
2650
2651 void ieee80211_scan_completed(struct ieee80211_hw *hw)
2652 {
2653         struct ieee80211_local *local = hw_to_local(hw);
2654         struct net_device *dev = local->scan_dev;
2655         struct ieee80211_sub_if_data *sdata;
2656         union iwreq_data wrqu;
2657
2658         local->last_scan_completed = jiffies;
2659         wmb();
2660         local->sta_scanning = 0;
2661
2662         if (ieee80211_hw_config(local))
2663                 printk(KERN_DEBUG "%s: failed to restore operational"
2664                        "channel after scan\n", dev->name);
2665
2666
2667         netif_tx_lock_bh(local->mdev);
2668         local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
2669         local->ops->configure_filter(local_to_hw(local),
2670                                      FIF_BCN_PRBRESP_PROMISC,
2671                                      &local->filter_flags,
2672                                      local->mdev->mc_count,
2673                                      local->mdev->mc_list);
2674
2675         netif_tx_unlock_bh(local->mdev);
2676
2677         memset(&wrqu, 0, sizeof(wrqu));
2678         wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
2679
2680         rcu_read_lock();
2681         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2682
2683                 /* No need to wake the master device. */
2684                 if (sdata->dev == local->mdev)
2685                         continue;
2686
2687                 if (sdata->type == IEEE80211_IF_TYPE_STA) {
2688                         if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED)
2689                                 ieee80211_send_nullfunc(local, sdata, 0);
2690                         ieee80211_sta_timer((unsigned long)sdata);
2691                 }
2692
2693                 netif_wake_queue(sdata->dev);
2694         }
2695         rcu_read_unlock();
2696
2697         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2698         if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
2699                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2700                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2701                     (!ifsta->state == IEEE80211_IBSS_JOINED &&
2702                     !ieee80211_sta_active_ibss(dev)))
2703                         ieee80211_sta_find_ibss(dev, ifsta);
2704         }
2705 }
2706 EXPORT_SYMBOL(ieee80211_scan_completed);
2707
2708 void ieee80211_sta_scan_work(struct work_struct *work)
2709 {
2710         struct ieee80211_local *local =
2711                 container_of(work, struct ieee80211_local, scan_work.work);
2712         struct net_device *dev = local->scan_dev;
2713         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2714         struct ieee80211_hw_mode *mode;
2715         struct ieee80211_channel *chan;
2716         int skip;
2717         unsigned long next_delay = 0;
2718
2719         if (!local->sta_scanning)
2720                 return;
2721
2722         switch (local->scan_state) {
2723         case SCAN_SET_CHANNEL:
2724                 mode = local->scan_hw_mode;
2725                 if (local->scan_hw_mode->list.next == &local->modes_list &&
2726                     local->scan_channel_idx >= mode->num_channels) {
2727                         ieee80211_scan_completed(local_to_hw(local));
2728                         return;
2729                 }
2730                 skip = !(local->enabled_modes & (1 << mode->mode));
2731                 chan = &mode->channels[local->scan_channel_idx];
2732                 if (!(chan->flag & IEEE80211_CHAN_W_SCAN) ||
2733                     (sdata->type == IEEE80211_IF_TYPE_IBSS &&
2734                      !(chan->flag & IEEE80211_CHAN_W_IBSS)) ||
2735                     (local->hw_modes & local->enabled_modes &
2736                      (1 << MODE_IEEE80211G) && mode->mode == MODE_IEEE80211B))
2737                         skip = 1;
2738
2739                 if (!skip) {
2740 #if 0
2741                         printk(KERN_DEBUG "%s: scan channel %d (%d MHz)\n",
2742                                dev->name, chan->chan, chan->freq);
2743 #endif
2744
2745                         local->scan_channel = chan;
2746                         if (ieee80211_hw_config(local)) {
2747                                 printk(KERN_DEBUG "%s: failed to set channel "
2748                                        "%d (%d MHz) for scan\n", dev->name,
2749                                        chan->chan, chan->freq);
2750                                 skip = 1;
2751                         }
2752                 }
2753
2754                 local->scan_channel_idx++;
2755                 if (local->scan_channel_idx >= local->scan_hw_mode->num_channels) {
2756                         if (local->scan_hw_mode->list.next != &local->modes_list) {
2757                                 local->scan_hw_mode = list_entry(local->scan_hw_mode->list.next,
2758                                                                  struct ieee80211_hw_mode,
2759                                                                  list);
2760                                 local->scan_channel_idx = 0;
2761                         }
2762                 }
2763
2764                 if (skip)
2765                         break;
2766
2767                 next_delay = IEEE80211_PROBE_DELAY +
2768                              usecs_to_jiffies(local->hw.channel_change_time);
2769                 local->scan_state = SCAN_SEND_PROBE;
2770                 break;
2771         case SCAN_SEND_PROBE:
2772                 if (local->scan_channel->flag & IEEE80211_CHAN_W_ACTIVE_SCAN) {
2773                         ieee80211_send_probe_req(dev, NULL, local->scan_ssid,
2774                                                  local->scan_ssid_len);
2775                         next_delay = IEEE80211_CHANNEL_TIME;
2776                 } else
2777                         next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
2778                 local->scan_state = SCAN_SET_CHANNEL;
2779                 break;
2780         }
2781
2782         if (local->sta_scanning)
2783                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2784                                    next_delay);
2785 }
2786
2787
2788 static int ieee80211_sta_start_scan(struct net_device *dev,
2789                                     u8 *ssid, size_t ssid_len)
2790 {
2791         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2792         struct ieee80211_sub_if_data *sdata;
2793
2794         if (ssid_len > IEEE80211_MAX_SSID_LEN)
2795                 return -EINVAL;
2796
2797         /* MLME-SCAN.request (page 118)  page 144 (11.1.3.1)
2798          * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
2799          * BSSID: MACAddress
2800          * SSID
2801          * ScanType: ACTIVE, PASSIVE
2802          * ProbeDelay: delay (in microseconds) to be used prior to transmitting
2803          *    a Probe frame during active scanning
2804          * ChannelList
2805          * MinChannelTime (>= ProbeDelay), in TU
2806          * MaxChannelTime: (>= MinChannelTime), in TU
2807          */
2808
2809          /* MLME-SCAN.confirm
2810           * BSSDescriptionSet
2811           * ResultCode: SUCCESS, INVALID_PARAMETERS
2812          */
2813
2814         if (local->sta_scanning) {
2815                 if (local->scan_dev == dev)
2816                         return 0;
2817                 return -EBUSY;
2818         }
2819
2820         if (local->ops->hw_scan) {
2821                 int rc = local->ops->hw_scan(local_to_hw(local),
2822                                             ssid, ssid_len);
2823                 if (!rc) {
2824                         local->sta_scanning = 1;
2825                         local->scan_dev = dev;
2826                 }
2827                 return rc;
2828         }
2829
2830         local->sta_scanning = 1;
2831
2832         rcu_read_lock();
2833         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2834
2835                 /* Don't stop the master interface, otherwise we can't transmit
2836                  * probes! */
2837                 if (sdata->dev == local->mdev)
2838                         continue;
2839
2840                 netif_stop_queue(sdata->dev);
2841                 if (sdata->type == IEEE80211_IF_TYPE_STA &&
2842                     (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED))
2843                         ieee80211_send_nullfunc(local, sdata, 1);
2844         }
2845         rcu_read_unlock();
2846
2847         if (ssid) {
2848                 local->scan_ssid_len = ssid_len;
2849                 memcpy(local->scan_ssid, ssid, ssid_len);
2850         } else
2851                 local->scan_ssid_len = 0;
2852         local->scan_state = SCAN_SET_CHANNEL;
2853         local->scan_hw_mode = list_entry(local->modes_list.next,
2854                                          struct ieee80211_hw_mode,
2855                                          list);
2856         local->scan_channel_idx = 0;
2857         local->scan_dev = dev;
2858
2859         netif_tx_lock_bh(local->mdev);
2860         local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
2861         local->ops->configure_filter(local_to_hw(local),
2862                                      FIF_BCN_PRBRESP_PROMISC,
2863                                      &local->filter_flags,
2864                                      local->mdev->mc_count,
2865                                      local->mdev->mc_list);
2866         netif_tx_unlock_bh(local->mdev);
2867
2868         /* TODO: start scan as soon as all nullfunc frames are ACKed */
2869         queue_delayed_work(local->hw.workqueue, &local->scan_work,
2870                            IEEE80211_CHANNEL_TIME);
2871
2872         return 0;
2873 }
2874
2875
2876 int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
2877 {
2878         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2879         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2880         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2881
2882         if (sdata->type != IEEE80211_IF_TYPE_STA)
2883                 return ieee80211_sta_start_scan(dev, ssid, ssid_len);
2884
2885         if (local->sta_scanning) {
2886                 if (local->scan_dev == dev)
2887                         return 0;
2888                 return -EBUSY;
2889         }
2890
2891         set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
2892         queue_work(local->hw.workqueue, &ifsta->work);
2893         return 0;
2894 }
2895
2896 static char *
2897 ieee80211_sta_scan_result(struct net_device *dev,
2898                           struct ieee80211_sta_bss *bss,
2899                           char *current_ev, char *end_buf)
2900 {
2901         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2902         struct iw_event iwe;
2903
2904         if (time_after(jiffies,
2905                        bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
2906                 return current_ev;
2907
2908         if (!(local->enabled_modes & (1 << bss->hw_mode)))
2909                 return current_ev;
2910
2911         if (local->scan_flags & IEEE80211_SCAN_WPA_ONLY &&
2912             !bss->wpa_ie && !bss->rsn_ie)
2913                 return current_ev;
2914
2915         if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID &&
2916             (local->scan_ssid_len != bss->ssid_len ||
2917              memcmp(local->scan_ssid, bss->ssid, bss->ssid_len) != 0))
2918                 return current_ev;
2919
2920         memset(&iwe, 0, sizeof(iwe));
2921         iwe.cmd = SIOCGIWAP;
2922         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2923         memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2924         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2925                                           IW_EV_ADDR_LEN);
2926
2927         memset(&iwe, 0, sizeof(iwe));
2928         iwe.cmd = SIOCGIWESSID;
2929         iwe.u.data.length = bss->ssid_len;
2930         iwe.u.data.flags = 1;
2931         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2932                                           bss->ssid);
2933
2934         if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)) {
2935                 memset(&iwe, 0, sizeof(iwe));
2936                 iwe.cmd = SIOCGIWMODE;
2937                 if (bss->capability & WLAN_CAPABILITY_ESS)
2938                         iwe.u.mode = IW_MODE_MASTER;
2939                 else
2940                         iwe.u.mode = IW_MODE_ADHOC;
2941                 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2942                                                   IW_EV_UINT_LEN);
2943         }
2944
2945         memset(&iwe, 0, sizeof(iwe));
2946         iwe.cmd = SIOCGIWFREQ;
2947         iwe.u.freq.m = bss->channel;
2948         iwe.u.freq.e = 0;
2949         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2950                                           IW_EV_FREQ_LEN);
2951         iwe.u.freq.m = bss->freq * 100000;
2952         iwe.u.freq.e = 1;
2953         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2954                                           IW_EV_FREQ_LEN);
2955
2956         memset(&iwe, 0, sizeof(iwe));
2957         iwe.cmd = IWEVQUAL;
2958         iwe.u.qual.qual = bss->signal;
2959         iwe.u.qual.level = bss->rssi;
2960         iwe.u.qual.noise = bss->noise;
2961         iwe.u.qual.updated = local->wstats_flags;
2962         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2963                                           IW_EV_QUAL_LEN);
2964
2965         memset(&iwe, 0, sizeof(iwe));
2966         iwe.cmd = SIOCGIWENCODE;
2967         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
2968                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2969         else
2970                 iwe.u.data.flags = IW_ENCODE_DISABLED;
2971         iwe.u.data.length = 0;
2972         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, "");
2973
2974         if (bss && bss->wpa_ie) {
2975                 memset(&iwe, 0, sizeof(iwe));
2976                 iwe.cmd = IWEVGENIE;
2977                 iwe.u.data.length = bss->wpa_ie_len;
2978                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2979                                                   bss->wpa_ie);
2980         }
2981
2982         if (bss && bss->rsn_ie) {
2983                 memset(&iwe, 0, sizeof(iwe));
2984                 iwe.cmd = IWEVGENIE;
2985                 iwe.u.data.length = bss->rsn_ie_len;
2986                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2987                                                   bss->rsn_ie);
2988         }
2989
2990         if (bss && bss->supp_rates_len > 0) {
2991                 /* display all supported rates in readable format */
2992                 char *p = current_ev + IW_EV_LCP_LEN;
2993                 int i;
2994
2995                 memset(&iwe, 0, sizeof(iwe));
2996                 iwe.cmd = SIOCGIWRATE;
2997                 /* Those two flags are ignored... */
2998                 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2999
3000                 for (i = 0; i < bss->supp_rates_len; i++) {
3001                         iwe.u.bitrate.value = ((bss->supp_rates[i] &
3002                                                         0x7f) * 500000);
3003                         p = iwe_stream_add_value(current_ev, p,
3004                                         end_buf, &iwe, IW_EV_PARAM_LEN);
3005                 }
3006                 current_ev = p;
3007         }
3008
3009         if (bss) {
3010                 char *buf;
3011                 buf = kmalloc(30, GFP_ATOMIC);
3012                 if (buf) {
3013                         memset(&iwe, 0, sizeof(iwe));
3014                         iwe.cmd = IWEVCUSTOM;
3015                         sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
3016                         iwe.u.data.length = strlen(buf);
3017                         current_ev = iwe_stream_add_point(current_ev, end_buf,
3018                                                           &iwe, buf);
3019                         kfree(buf);
3020                 }
3021         }
3022
3023         do {
3024                 char *buf;
3025
3026                 if (!(local->scan_flags & IEEE80211_SCAN_EXTRA_INFO))
3027                         break;
3028
3029                 buf = kmalloc(100, GFP_ATOMIC);
3030                 if (!buf)
3031                         break;
3032
3033                 memset(&iwe, 0, sizeof(iwe));
3034                 iwe.cmd = IWEVCUSTOM;
3035                 sprintf(buf, "bcn_int=%d", bss->beacon_int);
3036                 iwe.u.data.length = strlen(buf);
3037                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3038                                                   buf);
3039
3040                 memset(&iwe, 0, sizeof(iwe));
3041                 iwe.cmd = IWEVCUSTOM;
3042                 sprintf(buf, "capab=0x%04x", bss->capability);
3043                 iwe.u.data.length = strlen(buf);
3044                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3045                                                   buf);
3046
3047                 kfree(buf);
3048                 break;
3049         } while (0);
3050
3051         return current_ev;
3052 }
3053
3054
3055 int ieee80211_sta_scan_results(struct net_device *dev, char *buf, size_t len)
3056 {
3057         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3058         char *current_ev = buf;
3059         char *end_buf = buf + len;
3060         struct ieee80211_sta_bss *bss;
3061
3062         spin_lock_bh(&local->sta_bss_lock);
3063         list_for_each_entry(bss, &local->sta_bss_list, list) {
3064                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3065                         spin_unlock_bh(&local->sta_bss_lock);
3066                         return -E2BIG;
3067                 }
3068                 current_ev = ieee80211_sta_scan_result(dev, bss, current_ev,
3069                                                        end_buf);
3070         }
3071         spin_unlock_bh(&local->sta_bss_lock);
3072         return current_ev - buf;
3073 }
3074
3075
3076 int ieee80211_sta_set_extra_ie(struct net_device *dev, char *ie, size_t len)
3077 {
3078         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3079         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3080         kfree(ifsta->extra_ie);
3081         if (len == 0) {
3082                 ifsta->extra_ie = NULL;
3083                 ifsta->extra_ie_len = 0;
3084                 return 0;
3085         }
3086         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
3087         if (!ifsta->extra_ie) {
3088                 ifsta->extra_ie_len = 0;
3089                 return -ENOMEM;
3090         }
3091         memcpy(ifsta->extra_ie, ie, len);
3092         ifsta->extra_ie_len = len;
3093         return 0;
3094 }
3095
3096
3097 struct sta_info * ieee80211_ibss_add_sta(struct net_device *dev,
3098                                          struct sk_buff *skb, u8 *bssid,
3099                                          u8 *addr)
3100 {
3101         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3102         struct sta_info *sta;
3103         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3104         DECLARE_MAC_BUF(mac);
3105
3106         /* TODO: Could consider removing the least recently used entry and
3107          * allow new one to be added. */
3108         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
3109                 if (net_ratelimit()) {
3110                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
3111                                "entry %s\n", dev->name, print_mac(mac, addr));
3112                 }
3113                 return NULL;
3114         }
3115
3116         printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
3117                wiphy_name(local->hw.wiphy), print_mac(mac, addr), dev->name);
3118
3119         sta = sta_info_add(local, dev, addr, GFP_ATOMIC);
3120         if (!sta)
3121                 return NULL;
3122
3123         sta->supp_rates = sdata->u.sta.supp_rates_bits;
3124
3125         rate_control_rate_init(sta, local);
3126
3127         return sta; /* caller will call sta_info_put() */
3128 }
3129
3130
3131 int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason)
3132 {
3133         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3134         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3135
3136         printk(KERN_DEBUG "%s: deauthenticate(reason=%d)\n",
3137                dev->name, reason);
3138
3139         if (sdata->type != IEEE80211_IF_TYPE_STA &&
3140             sdata->type != IEEE80211_IF_TYPE_IBSS)
3141                 return -EINVAL;
3142
3143         ieee80211_send_deauth(dev, ifsta, reason);
3144         ieee80211_set_disassoc(dev, ifsta, 1);
3145         return 0;
3146 }
3147
3148
3149 int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
3150 {
3151         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3152         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3153
3154         printk(KERN_DEBUG "%s: disassociate(reason=%d)\n",
3155                dev->name, reason);
3156
3157         if (sdata->type != IEEE80211_IF_TYPE_STA)
3158                 return -EINVAL;
3159
3160         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
3161                 return -1;
3162
3163         ieee80211_send_disassoc(dev, ifsta, reason);
3164         ieee80211_set_disassoc(dev, ifsta, 0);
3165         return 0;
3166 }