src/ap/ieee802_11_shared.c

   1 /*
   2  * hostapd / IEEE 802.11 Management
   3  * Copyright (c) 2002-2012, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "common/ieee802_11_defs.h"
  13 #include "hostapd.h"
  14 #include "sta_info.h"
  15 #include "ap_config.h"
  16 #include "ap_drv_ops.h"
  17 #include "ieee802_11.h"
  18
  19
  20 #ifdef CONFIG_IEEE80211W
  21
  22 u8 * hostapd_eid_assoc_comeback_time(struct hostapd_data *hapd,
  23                                      struct sta_info *sta, u8 *eid)
  24 {
  25         u8 *pos = eid;
  26         u32 timeout, tu;
  27         struct os_reltime now, passed;
  28
  29         *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
  30         *pos++ = 5;
  31         *pos++ = WLAN_TIMEOUT_ASSOC_COMEBACK;
  32         os_get_reltime(&now);
  33         os_reltime_sub(&now, &sta->sa_query_start, &passed);
  34         tu = (passed.sec * 1000000 + passed.usec) / 1024;
  35         if (hapd->conf->assoc_sa_query_max_timeout > tu)
  36                 timeout = hapd->conf->assoc_sa_query_max_timeout - tu;
  37         else
  38                 timeout = 0;
  39         if (timeout < hapd->conf->assoc_sa_query_max_timeout)
  40                 timeout++; /* add some extra time for local timers */
  41         WPA_PUT_LE32(pos, timeout);
  42         pos += 4;
  43
  44         return pos;
  45 }
  46
  47
  48 /* MLME-SAQuery.request */
  49 void ieee802_11_send_sa_query_req(struct hostapd_data *hapd,
  50                                   const u8 *addr, const u8 *trans_id)
  51 {
  52         struct ieee80211_mgmt mgmt;
  53         u8 *end;
  54
  55         wpa_printf(MSG_DEBUG, "IEEE 802.11: Sending SA Query Request to "
  56                    MACSTR, MAC2STR(addr));
  57         wpa_hexdump(MSG_DEBUG, "IEEE 802.11: SA Query Transaction ID",
  58                     trans_id, WLAN_SA_QUERY_TR_ID_LEN);
  59
  60         os_memset(&mgmt, 0, sizeof(mgmt));
  61         mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
  62                                           WLAN_FC_STYPE_ACTION);
  63         os_memcpy(mgmt.da, addr, ETH_ALEN);
  64         os_memcpy(mgmt.sa, hapd->own_addr, ETH_ALEN);
  65         os_memcpy(mgmt.bssid, hapd->own_addr, ETH_ALEN);
  66         mgmt.u.action.category = WLAN_ACTION_SA_QUERY;
  67         mgmt.u.action.u.sa_query_req.action = WLAN_SA_QUERY_REQUEST;
  68         os_memcpy(mgmt.u.action.u.sa_query_req.trans_id, trans_id,
  69                   WLAN_SA_QUERY_TR_ID_LEN);
  70         end = mgmt.u.action.u.sa_query_req.trans_id + WLAN_SA_QUERY_TR_ID_LEN;
  71         if (hostapd_drv_send_mlme(hapd, &mgmt, end - (u8 *) &mgmt, 0) < 0)
  72                 wpa_printf(MSG_INFO, "ieee802_11_send_sa_query_req: send failed");
  73 }
  74
  75
  76 static void ieee802_11_send_sa_query_resp(struct hostapd_data *hapd,
  77                                           const u8 *sa, const u8 *trans_id)
  78 {
  79         struct sta_info *sta;
  80         struct ieee80211_mgmt resp;
  81         u8 *end;
  82
  83         wpa_printf(MSG_DEBUG, "IEEE 802.11: Received SA Query Request from "
  84                    MACSTR, MAC2STR(sa));
  85         wpa_hexdump(MSG_DEBUG, "IEEE 802.11: SA Query Transaction ID",
  86                     trans_id, WLAN_SA_QUERY_TR_ID_LEN);
  87
  88         sta = ap_get_sta(hapd, sa);
  89         if (sta == NULL || !(sta->flags & WLAN_STA_ASSOC)) {
  90                 wpa_printf(MSG_DEBUG, "IEEE 802.11: Ignore SA Query Request "
  91                            "from unassociated STA " MACSTR, MAC2STR(sa));
  92                 return;
  93         }
  94
  95         wpa_printf(MSG_DEBUG, "IEEE 802.11: Sending SA Query Response to "
  96                    MACSTR, MAC2STR(sa));
  97
  98         os_memset(&resp, 0, sizeof(resp));
  99         resp.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 100                                           WLAN_FC_STYPE_ACTION);
 101         os_memcpy(resp.da, sa, ETH_ALEN);
 102         os_memcpy(resp.sa, hapd->own_addr, ETH_ALEN);
 103         os_memcpy(resp.bssid, hapd->own_addr, ETH_ALEN);
 104         resp.u.action.category = WLAN_ACTION_SA_QUERY;
 105         resp.u.action.u.sa_query_req.action = WLAN_SA_QUERY_RESPONSE;
 106         os_memcpy(resp.u.action.u.sa_query_req.trans_id, trans_id,
 107                   WLAN_SA_QUERY_TR_ID_LEN);
 108         end = resp.u.action.u.sa_query_req.trans_id + WLAN_SA_QUERY_TR_ID_LEN;
 109         if (hostapd_drv_send_mlme(hapd, &resp, end - (u8 *) &resp, 0) < 0)
 110                 wpa_printf(MSG_INFO, "ieee80211_mgmt_sa_query_request: send failed");
 111 }
 112
 113
 114 void ieee802_11_sa_query_action(struct hostapd_data *hapd, const u8 *sa,
 115                                 const u8 action_type, const u8 *trans_id)
 116 {
 117         struct sta_info *sta;
 118         int i;
 119
 120         if (action_type == WLAN_SA_QUERY_REQUEST) {
 121                 ieee802_11_send_sa_query_resp(hapd, sa, trans_id);
 122                 return;
 123         }
 124
 125         if (action_type != WLAN_SA_QUERY_RESPONSE) {
 126                 wpa_printf(MSG_DEBUG, "IEEE 802.11: Unexpected SA Query "
 127                            "Action %d", action_type);
 128                 return;
 129         }
 130
 131         wpa_printf(MSG_DEBUG, "IEEE 802.11: Received SA Query Response from "
 132                    MACSTR, MAC2STR(sa));
 133         wpa_hexdump(MSG_DEBUG, "IEEE 802.11: SA Query Transaction ID",
 134                     trans_id, WLAN_SA_QUERY_TR_ID_LEN);
 135
 136         /* MLME-SAQuery.confirm */
 137
 138         sta = ap_get_sta(hapd, sa);
 139         if (sta == NULL || sta->sa_query_trans_id == NULL) {
 140                 wpa_printf(MSG_DEBUG, "IEEE 802.11: No matching STA with "
 141                            "pending SA Query request found");
 142                 return;
 143         }
 144
 145         for (i = 0; i < sta->sa_query_count; i++) {
 146                 if (os_memcmp(sta->sa_query_trans_id +
 147                               i * WLAN_SA_QUERY_TR_ID_LEN,
 148                               trans_id, WLAN_SA_QUERY_TR_ID_LEN) == 0)
 149                         break;
 150         }
 151
 152         if (i >= sta->sa_query_count) {
 153                 wpa_printf(MSG_DEBUG, "IEEE 802.11: No matching SA Query "
 154                            "transaction identifier found");
 155                 return;
 156         }
 157
 158         hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
 159                        HOSTAPD_LEVEL_DEBUG,
 160                        "Reply to pending SA Query received");
 161         ap_sta_stop_sa_query(hapd, sta);
 162 }
 163
 164 #endif /* CONFIG_IEEE80211W */
 165
 166
 167 static void hostapd_ext_capab_byte(struct hostapd_data *hapd, u8 *pos, int idx)
 168 {
 169         *pos = 0x00;
 170
 171         switch (idx) {
 172         case 0: /* Bits 0-7 */
 173                 break;
 174         case 1: /* Bits 8-15 */
 175                 break;
 176         case 2: /* Bits 16-23 */
 177                 if (hapd->conf->wnm_sleep_mode)
 178                         *pos |= 0x02; /* Bit 17 - WNM-Sleep Mode */
 179                 if (hapd->conf->bss_transition)
 180                         *pos |= 0x08; /* Bit 19 - BSS Transition */
 181                 break;
 182         case 3: /* Bits 24-31 */
 183 #ifdef CONFIG_WNM
 184                 *pos |= 0x02; /* Bit 25 - SSID List */
 185 #endif /* CONFIG_WNM */
 186                 if (hapd->conf->time_advertisement == 2)
 187                         *pos |= 0x08; /* Bit 27 - UTC TSF Offset */
 188                 if (hapd->conf->interworking)
 189                         *pos |= 0x80; /* Bit 31 - Interworking */
 190                 break;
 191         case 4: /* Bits 32-39 */
 192                 if (hapd->conf->qos_map_set_len)
 193                         *pos |= 0x01; /* Bit 32 - QoS Map */
 194                 if (hapd->conf->tdls & TDLS_PROHIBIT)
 195                         *pos |= 0x40; /* Bit 38 - TDLS Prohibited */
 196                 if (hapd->conf->tdls & TDLS_PROHIBIT_CHAN_SWITCH) {
 197                         /* Bit 39 - TDLS Channel Switching Prohibited */
 198                         *pos |= 0x80;
 199                 }
 200                 break;
 201         case 5: /* Bits 40-47 */
 202 #ifdef CONFIG_HS20
 203                 if (hapd->conf->hs20)
 204                         *pos |= 0x40; /* Bit 46 - WNM-Notification */
 205 #endif /* CONFIG_HS20 */
 206                 break;
 207         case 6: /* Bits 48-55 */
 208                 if (hapd->conf->ssid.utf8_ssid)
 209                         *pos |= 0x01; /* Bit 48 - UTF-8 SSID */
 210                 break;
 211         }
 212 }
 213
 214
 215 u8 * hostapd_eid_ext_capab(struct hostapd_data *hapd, u8 *eid)
 216 {
 217         u8 *pos = eid;
 218         u8 len = 0, i;
 219
 220         if (hapd->conf->tdls & (TDLS_PROHIBIT | TDLS_PROHIBIT_CHAN_SWITCH))
 221                 len = 5;
 222         if (len < 4 && hapd->conf->interworking)
 223                 len = 4;
 224         if (len < 3 && hapd->conf->wnm_sleep_mode)
 225                 len = 3;
 226         if (len < 7 && hapd->conf->ssid.utf8_ssid)
 227                 len = 7;
 228 #ifdef CONFIG_WNM
 229         if (len < 4)
 230                 len = 4;
 231 #endif /* CONFIG_WNM */
 232 #ifdef CONFIG_HS20
 233         if (hapd->conf->hs20 && len < 6)
 234                 len = 6;
 235 #endif /* CONFIG_HS20 */
 236         if (len < hapd->iface->extended_capa_len)
 237                 len = hapd->iface->extended_capa_len;
 238         if (len == 0)
 239                 return eid;
 240
 241         *pos++ = WLAN_EID_EXT_CAPAB;
 242         *pos++ = len;
 243         for (i = 0; i < len; i++, pos++) {
 244                 hostapd_ext_capab_byte(hapd, pos, i);
 245
 246                 if (i < hapd->iface->extended_capa_len) {
 247                         *pos &= ~hapd->iface->extended_capa_mask[i];
 248                         *pos |= hapd->iface->extended_capa[i];
 249                 }
 250         }
 251
 252         while (len > 0 && eid[1 + len] == 0) {
 253                 len--;
 254                 eid[1] = len;
 255         }
 256         if (len == 0)
 257                 return eid;
 258
 259         return eid + 2 + len;
 260 }
 261
 262
 263 u8 * hostapd_eid_qos_map_set(struct hostapd_data *hapd, u8 *eid)
 264 {
 265         u8 *pos = eid;
 266         u8 len = hapd->conf->qos_map_set_len;
 267
 268         if (!len)
 269                 return eid;
 270
 271         *pos++ = WLAN_EID_QOS_MAP_SET;
 272         *pos++ = len;
 273         os_memcpy(pos, hapd->conf->qos_map_set, len);
 274         pos += len;
 275
 276         return pos;
 277 }
 278
 279
 280 u8 * hostapd_eid_interworking(struct hostapd_data *hapd, u8 *eid)
 281 {
 282         u8 *pos = eid;
 283 #ifdef CONFIG_INTERWORKING
 284         u8 *len;
 285
 286         if (!hapd->conf->interworking)
 287                 return eid;
 288
 289         *pos++ = WLAN_EID_INTERWORKING;
 290         len = pos++;
 291
 292         *pos = hapd->conf->access_network_type;
 293         if (hapd->conf->internet)
 294                 *pos |= INTERWORKING_ANO_INTERNET;
 295         if (hapd->conf->asra)
 296                 *pos |= INTERWORKING_ANO_ASRA;
 297         if (hapd->conf->esr)
 298                 *pos |= INTERWORKING_ANO_ESR;
 299         if (hapd->conf->uesa)
 300                 *pos |= INTERWORKING_ANO_UESA;
 301         pos++;
 302
 303         if (hapd->conf->venue_info_set) {
 304                 *pos++ = hapd->conf->venue_group;
 305                 *pos++ = hapd->conf->venue_type;
 306         }
 307
 308         if (!is_zero_ether_addr(hapd->conf->hessid)) {
 309                 os_memcpy(pos, hapd->conf->hessid, ETH_ALEN);
 310                 pos += ETH_ALEN;
 311         }
 312
 313         *len = pos - len - 1;
 314 #endif /* CONFIG_INTERWORKING */
 315
 316         return pos;
 317 }
 318
 319
 320 u8 * hostapd_eid_adv_proto(struct hostapd_data *hapd, u8 *eid)
 321 {
 322         u8 *pos = eid;
 323 #ifdef CONFIG_INTERWORKING
 324
 325         /* TODO: Separate configuration for ANQP? */
 326         if (!hapd->conf->interworking)
 327                 return eid;
 328
 329         *pos++ = WLAN_EID_ADV_PROTO;
 330         *pos++ = 2;
 331         *pos++ = 0x7F; /* Query Response Length Limit | PAME-BI */
 332         *pos++ = ACCESS_NETWORK_QUERY_PROTOCOL;
 333 #endif /* CONFIG_INTERWORKING */
 334
 335         return pos;
 336 }
 337
 338
 339 u8 * hostapd_eid_roaming_consortium(struct hostapd_data *hapd, u8 *eid)
 340 {
 341         u8 *pos = eid;
 342 #ifdef CONFIG_INTERWORKING
 343         u8 *len;
 344         unsigned int i, count;
 345
 346         if (!hapd->conf->interworking ||
 347             hapd->conf->roaming_consortium == NULL ||
 348             hapd->conf->roaming_consortium_count == 0)
 349                 return eid;
 350
 351         *pos++ = WLAN_EID_ROAMING_CONSORTIUM;
 352         len = pos++;
 353
 354         /* Number of ANQP OIs (in addition to the max 3 listed here) */
 355         if (hapd->conf->roaming_consortium_count > 3 + 255)
 356                 *pos++ = 255;
 357         else if (hapd->conf->roaming_consortium_count > 3)
 358                 *pos++ = hapd->conf->roaming_consortium_count - 3;
 359         else
 360                 *pos++ = 0;
 361
 362         /* OU #1 and #2 Lengths */
 363         *pos = hapd->conf->roaming_consortium[0].len;
 364         if (hapd->conf->roaming_consortium_count > 1)
 365                 *pos |= hapd->conf->roaming_consortium[1].len << 4;
 366         pos++;
 367
 368         if (hapd->conf->roaming_consortium_count > 3)
 369                 count = 3;
 370         else
 371                 count = hapd->conf->roaming_consortium_count;
 372
 373         for (i = 0; i < count; i++) {
 374                 os_memcpy(pos, hapd->conf->roaming_consortium[i].oi,
 375                           hapd->conf->roaming_consortium[i].len);
 376                 pos += hapd->conf->roaming_consortium[i].len;
 377         }
 378
 379         *len = pos - len - 1;
 380 #endif /* CONFIG_INTERWORKING */
 381
 382         return pos;
 383 }
 384
 385
 386 u8 * hostapd_eid_time_adv(struct hostapd_data *hapd, u8 *eid)
 387 {
 388         if (hapd->conf->time_advertisement != 2)
 389                 return eid;
 390
 391         if (hapd->time_adv == NULL &&
 392             hostapd_update_time_adv(hapd) < 0)
 393                 return eid;
 394
 395         if (hapd->time_adv == NULL)
 396                 return eid;
 397
 398         os_memcpy(eid, wpabuf_head(hapd->time_adv),
 399                   wpabuf_len(hapd->time_adv));
 400         eid += wpabuf_len(hapd->time_adv);
 401
 402         return eid;
 403 }
 404
 405
 406 u8 * hostapd_eid_time_zone(struct hostapd_data *hapd, u8 *eid)
 407 {
 408         size_t len;
 409
 410         if (hapd->conf->time_advertisement != 2)
 411                 return eid;
 412
 413         len = os_strlen(hapd->conf->time_zone);
 414
 415         *eid++ = WLAN_EID_TIME_ZONE;
 416         *eid++ = len;
 417         os_memcpy(eid, hapd->conf->time_zone, len);
 418         eid += len;
 419
 420         return eid;
 421 }
 422
 423
 424 int hostapd_update_time_adv(struct hostapd_data *hapd)
 425 {
 426         const int elen = 2 + 1 + 10 + 5 + 1;
 427         struct os_time t;
 428         struct os_tm tm;
 429         u8 *pos;
 430
 431         if (hapd->conf->time_advertisement != 2)
 432                 return 0;
 433
 434         if (os_get_time(&t) < 0 || os_gmtime(t.sec, &tm) < 0)
 435                 return -1;
 436
 437         if (!hapd->time_adv) {
 438                 hapd->time_adv = wpabuf_alloc(elen);
 439                 if (hapd->time_adv == NULL)
 440                         return -1;
 441                 pos = wpabuf_put(hapd->time_adv, elen);
 442         } else
 443                 pos = wpabuf_mhead_u8(hapd->time_adv);
 444
 445         *pos++ = WLAN_EID_TIME_ADVERTISEMENT;
 446         *pos++ = 1 + 10 + 5 + 1;
 447
 448         *pos++ = 2; /* UTC time at which the TSF timer is 0 */
 449
 450         /* Time Value at TSF 0 */
 451         /* FIX: need to calculate this based on the current TSF value */
 452         WPA_PUT_LE16(pos, tm.year); /* Year */
 453         pos += 2;
 454         *pos++ = tm.month; /* Month */
 455         *pos++ = tm.day; /* Day of month */
 456         *pos++ = tm.hour; /* Hours */
 457         *pos++ = tm.min; /* Minutes */
 458         *pos++ = tm.sec; /* Seconds */
 459         WPA_PUT_LE16(pos, 0); /* Milliseconds (not used) */
 460         pos += 2;
 461         *pos++ = 0; /* Reserved */
 462
 463         /* Time Error */
 464         /* TODO: fill in an estimate on the error */
 465         *pos++ = 0;
 466         *pos++ = 0;
 467         *pos++ = 0;
 468         *pos++ = 0;
 469         *pos++ = 0;
 470
 471         *pos++ = hapd->time_update_counter++;
 472
 473         return 0;
 474 }
 475
 476
 477 u8 * hostapd_eid_bss_max_idle_period(struct hostapd_data *hapd, u8 *eid)
 478 {
 479         u8 *pos = eid;
 480
 481 #ifdef CONFIG_WNM
 482         if (hapd->conf->ap_max_inactivity > 0) {
 483                 unsigned int val;
 484                 *pos++ = WLAN_EID_BSS_MAX_IDLE_PERIOD;
 485                 *pos++ = 3;
 486                 val = hapd->conf->ap_max_inactivity;
 487                 if (val > 68000)
 488                         val = 68000;
 489                 val *= 1000;
 490                 val /= 1024;
 491                 if (val == 0)
 492                         val = 1;
 493                 if (val > 65535)
 494                         val = 65535;
 495                 WPA_PUT_LE16(pos, val);
 496                 pos += 2;
 497                 *pos++ = 0x00; /* TODO: Protected Keep-Alive Required */
 498         }
 499 #endif /* CONFIG_WNM */
 500
 501         return pos;
 502 }