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                 if (hapd->iconf->obss_interval)
 174                         *pos |= 0x01; /* Bit 0 - Coexistence management */
 175                 if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_AP_CSA)
 176                         *pos |= 0x04; /* Bit 2 - Extended Channel Switching */
 177                 break;
 178         case 1: /* Bits 8-15 */
 179                 if (hapd->conf->proxy_arp)
 180                         *pos |= 0x10; /* Bit 12 - Proxy ARP */
 181                 break;
 182         case 2: /* Bits 16-23 */
 183                 if (hapd->conf->wnm_sleep_mode)
 184                         *pos |= 0x02; /* Bit 17 - WNM-Sleep Mode */
 185                 if (hapd->conf->bss_transition)
 186                         *pos |= 0x08; /* Bit 19 - BSS Transition */
 187                 break;
 188         case 3: /* Bits 24-31 */
 189 #ifdef CONFIG_WNM
 190                 *pos |= 0x02; /* Bit 25 - SSID List */
 191 #endif /* CONFIG_WNM */
 192                 if (hapd->conf->time_advertisement == 2)
 193                         *pos |= 0x08; /* Bit 27 - UTC TSF Offset */
 194                 if (hapd->conf->interworking)
 195                         *pos |= 0x80; /* Bit 31 - Interworking */
 196                 break;
 197         case 4: /* Bits 32-39 */
 198                 if (hapd->conf->qos_map_set_len)
 199                         *pos |= 0x01; /* Bit 32 - QoS Map */
 200                 if (hapd->conf->tdls & TDLS_PROHIBIT)
 201                         *pos |= 0x40; /* Bit 38 - TDLS Prohibited */
 202                 if (hapd->conf->tdls & TDLS_PROHIBIT_CHAN_SWITCH) {
 203                         /* Bit 39 - TDLS Channel Switching Prohibited */
 204                         *pos |= 0x80;
 205                 }
 206                 break;
 207         case 5: /* Bits 40-47 */
 208 #ifdef CONFIG_HS20
 209                 if (hapd->conf->hs20)
 210                         *pos |= 0x40; /* Bit 46 - WNM-Notification */
 211 #endif /* CONFIG_HS20 */
 212 #ifdef CONFIG_MBO
 213                 if (hapd->conf->mbo_enabled)
 214                         *pos |= 0x40; /* Bit 46 - WNM-Notification */
 215 #endif /* CONFIG_MBO */
 216                 break;
 217         case 6: /* Bits 48-55 */
 218                 if (hapd->conf->ssid.utf8_ssid)
 219                         *pos |= 0x01; /* Bit 48 - UTF-8 SSID */
 220                 break;
 221         }
 222 }
 223
 224
 225 u8 * hostapd_eid_ext_capab(struct hostapd_data *hapd, u8 *eid)
 226 {
 227         u8 *pos = eid;
 228         u8 len = 0, i;
 229
 230         if (hapd->conf->tdls & (TDLS_PROHIBIT | TDLS_PROHIBIT_CHAN_SWITCH))
 231                 len = 5;
 232         if (len < 4 && hapd->conf->interworking)
 233                 len = 4;
 234         if (len < 3 && hapd->conf->wnm_sleep_mode)
 235                 len = 3;
 236         if (len < 1 && hapd->iconf->obss_interval)
 237                 len = 1;
 238         if (len < 7 && hapd->conf->ssid.utf8_ssid)
 239                 len = 7;
 240 #ifdef CONFIG_WNM
 241         if (len < 4)
 242                 len = 4;
 243 #endif /* CONFIG_WNM */
 244 #ifdef CONFIG_HS20
 245         if (hapd->conf->hs20 && len < 6)
 246                 len = 6;
 247 #endif /* CONFIG_HS20 */
 248 #ifdef CONFIG_MBO
 249         if (hapd->conf->mbo_enabled && len < 6)
 250                 len = 6;
 251 #endif /* CONFIG_MBO */
 252         if (len < hapd->iface->extended_capa_len)
 253                 len = hapd->iface->extended_capa_len;
 254         if (len == 0)
 255                 return eid;
 256
 257         *pos++ = WLAN_EID_EXT_CAPAB;
 258         *pos++ = len;
 259         for (i = 0; i < len; i++, pos++) {
 260                 hostapd_ext_capab_byte(hapd, pos, i);
 261
 262                 if (i < hapd->iface->extended_capa_len) {
 263                         *pos &= ~hapd->iface->extended_capa_mask[i];
 264                         *pos |= hapd->iface->extended_capa[i];
 265                 }
 266         }
 267
 268         while (len > 0 && eid[1 + len] == 0) {
 269                 len--;
 270                 eid[1] = len;
 271         }
 272         if (len == 0)
 273                 return eid;
 274
 275         return eid + 2 + len;
 276 }
 277
 278
 279 u8 * hostapd_eid_qos_map_set(struct hostapd_data *hapd, u8 *eid)
 280 {
 281         u8 *pos = eid;
 282         u8 len = hapd->conf->qos_map_set_len;
 283
 284         if (!len)
 285                 return eid;
 286
 287         *pos++ = WLAN_EID_QOS_MAP_SET;
 288         *pos++ = len;
 289         os_memcpy(pos, hapd->conf->qos_map_set, len);
 290         pos += len;
 291
 292         return pos;
 293 }
 294
 295
 296 u8 * hostapd_eid_interworking(struct hostapd_data *hapd, u8 *eid)
 297 {
 298         u8 *pos = eid;
 299 #ifdef CONFIG_INTERWORKING
 300         u8 *len;
 301
 302         if (!hapd->conf->interworking)
 303                 return eid;
 304
 305         *pos++ = WLAN_EID_INTERWORKING;
 306         len = pos++;
 307
 308         *pos = hapd->conf->access_network_type;
 309         if (hapd->conf->internet)
 310                 *pos |= INTERWORKING_ANO_INTERNET;
 311         if (hapd->conf->asra)
 312                 *pos |= INTERWORKING_ANO_ASRA;
 313         if (hapd->conf->esr)
 314                 *pos |= INTERWORKING_ANO_ESR;
 315         if (hapd->conf->uesa)
 316                 *pos |= INTERWORKING_ANO_UESA;
 317         pos++;
 318
 319         if (hapd->conf->venue_info_set) {
 320                 *pos++ = hapd->conf->venue_group;
 321                 *pos++ = hapd->conf->venue_type;
 322         }
 323
 324         if (!is_zero_ether_addr(hapd->conf->hessid)) {
 325                 os_memcpy(pos, hapd->conf->hessid, ETH_ALEN);
 326                 pos += ETH_ALEN;
 327         }
 328
 329         *len = pos - len - 1;
 330 #endif /* CONFIG_INTERWORKING */
 331
 332         return pos;
 333 }
 334
 335
 336 u8 * hostapd_eid_adv_proto(struct hostapd_data *hapd, u8 *eid)
 337 {
 338         u8 *pos = eid;
 339 #ifdef CONFIG_INTERWORKING
 340
 341         /* TODO: Separate configuration for ANQP? */
 342         if (!hapd->conf->interworking)
 343                 return eid;
 344
 345         *pos++ = WLAN_EID_ADV_PROTO;
 346         *pos++ = 2;
 347         *pos++ = 0x7F; /* Query Response Length Limit | PAME-BI */
 348         *pos++ = ACCESS_NETWORK_QUERY_PROTOCOL;
 349 #endif /* CONFIG_INTERWORKING */
 350
 351         return pos;
 352 }
 353
 354
 355 u8 * hostapd_eid_roaming_consortium(struct hostapd_data *hapd, u8 *eid)
 356 {
 357         u8 *pos = eid;
 358 #ifdef CONFIG_INTERWORKING
 359         u8 *len;
 360         unsigned int i, count;
 361
 362         if (!hapd->conf->interworking ||
 363             hapd->conf->roaming_consortium == NULL ||
 364             hapd->conf->roaming_consortium_count == 0)
 365                 return eid;
 366
 367         *pos++ = WLAN_EID_ROAMING_CONSORTIUM;
 368         len = pos++;
 369
 370         /* Number of ANQP OIs (in addition to the max 3 listed here) */
 371         if (hapd->conf->roaming_consortium_count > 3 + 255)
 372                 *pos++ = 255;
 373         else if (hapd->conf->roaming_consortium_count > 3)
 374                 *pos++ = hapd->conf->roaming_consortium_count - 3;
 375         else
 376                 *pos++ = 0;
 377
 378         /* OU #1 and #2 Lengths */
 379         *pos = hapd->conf->roaming_consortium[0].len;
 380         if (hapd->conf->roaming_consortium_count > 1)
 381                 *pos |= hapd->conf->roaming_consortium[1].len << 4;
 382         pos++;
 383
 384         if (hapd->conf->roaming_consortium_count > 3)
 385                 count = 3;
 386         else
 387                 count = hapd->conf->roaming_consortium_count;
 388
 389         for (i = 0; i < count; i++) {
 390                 os_memcpy(pos, hapd->conf->roaming_consortium[i].oi,
 391                           hapd->conf->roaming_consortium[i].len);
 392                 pos += hapd->conf->roaming_consortium[i].len;
 393         }
 394
 395         *len = pos - len - 1;
 396 #endif /* CONFIG_INTERWORKING */
 397
 398         return pos;
 399 }
 400
 401
 402 u8 * hostapd_eid_time_adv(struct hostapd_data *hapd, u8 *eid)
 403 {
 404         if (hapd->conf->time_advertisement != 2)
 405                 return eid;
 406
 407         if (hapd->time_adv == NULL &&
 408             hostapd_update_time_adv(hapd) < 0)
 409                 return eid;
 410
 411         if (hapd->time_adv == NULL)
 412                 return eid;
 413
 414         os_memcpy(eid, wpabuf_head(hapd->time_adv),
 415                   wpabuf_len(hapd->time_adv));
 416         eid += wpabuf_len(hapd->time_adv);
 417
 418         return eid;
 419 }
 420
 421
 422 u8 * hostapd_eid_time_zone(struct hostapd_data *hapd, u8 *eid)
 423 {
 424         size_t len;
 425
 426         if (hapd->conf->time_advertisement != 2)
 427                 return eid;
 428
 429         len = os_strlen(hapd->conf->time_zone);
 430
 431         *eid++ = WLAN_EID_TIME_ZONE;
 432         *eid++ = len;
 433         os_memcpy(eid, hapd->conf->time_zone, len);
 434         eid += len;
 435
 436         return eid;
 437 }
 438
 439
 440 int hostapd_update_time_adv(struct hostapd_data *hapd)
 441 {
 442         const int elen = 2 + 1 + 10 + 5 + 1;
 443         struct os_time t;
 444         struct os_tm tm;
 445         u8 *pos;
 446
 447         if (hapd->conf->time_advertisement != 2)
 448                 return 0;
 449
 450         if (os_get_time(&t) < 0 || os_gmtime(t.sec, &tm) < 0)
 451                 return -1;
 452
 453         if (!hapd->time_adv) {
 454                 hapd->time_adv = wpabuf_alloc(elen);
 455                 if (hapd->time_adv == NULL)
 456                         return -1;
 457                 pos = wpabuf_put(hapd->time_adv, elen);
 458         } else
 459                 pos = wpabuf_mhead_u8(hapd->time_adv);
 460
 461         *pos++ = WLAN_EID_TIME_ADVERTISEMENT;
 462         *pos++ = 1 + 10 + 5 + 1;
 463
 464         *pos++ = 2; /* UTC time at which the TSF timer is 0 */
 465
 466         /* Time Value at TSF 0 */
 467         /* FIX: need to calculate this based on the current TSF value */
 468         WPA_PUT_LE16(pos, tm.year); /* Year */
 469         pos += 2;
 470         *pos++ = tm.month; /* Month */
 471         *pos++ = tm.day; /* Day of month */
 472         *pos++ = tm.hour; /* Hours */
 473         *pos++ = tm.min; /* Minutes */
 474         *pos++ = tm.sec; /* Seconds */
 475         WPA_PUT_LE16(pos, 0); /* Milliseconds (not used) */
 476         pos += 2;
 477         *pos++ = 0; /* Reserved */
 478
 479         /* Time Error */
 480         /* TODO: fill in an estimate on the error */
 481         *pos++ = 0;
 482         *pos++ = 0;
 483         *pos++ = 0;
 484         *pos++ = 0;
 485         *pos++ = 0;
 486
 487         *pos++ = hapd->time_update_counter++;
 488
 489         return 0;
 490 }
 491
 492
 493 u8 * hostapd_eid_bss_max_idle_period(struct hostapd_data *hapd, u8 *eid)
 494 {
 495         u8 *pos = eid;
 496
 497 #ifdef CONFIG_WNM
 498         if (hapd->conf->ap_max_inactivity > 0) {
 499                 unsigned int val;
 500                 *pos++ = WLAN_EID_BSS_MAX_IDLE_PERIOD;
 501                 *pos++ = 3;
 502                 val = hapd->conf->ap_max_inactivity;
 503                 if (val > 68000)
 504                         val = 68000;
 505                 val *= 1000;
 506                 val /= 1024;
 507                 if (val == 0)
 508                         val = 1;
 509                 if (val > 65535)
 510                         val = 65535;
 511                 WPA_PUT_LE16(pos, val);
 512                 pos += 2;
 513                 *pos++ = 0x00; /* TODO: Protected Keep-Alive Required */
 514         }
 515 #endif /* CONFIG_WNM */
 516
 517         return pos;
 518 }
 519
 520
 521 #ifdef CONFIG_MBO
 522
 523 u8 * hostapd_eid_mbo(struct hostapd_data *hapd, u8 *eid, size_t len)
 524 {
 525         u8 mbo[6], *mbo_pos = mbo;
 526         u8 *pos = eid;
 527
 528         if (!hapd->conf->mbo_enabled)
 529                 return eid;
 530
 531         *mbo_pos++ = MBO_ATTR_ID_AP_CAPA_IND;
 532         *mbo_pos++ = 1;
 533         /* Not Cellular aware */
 534         *mbo_pos++ = 0;
 535
 536         if (hapd->mbo_assoc_disallow) {
 537                 *mbo_pos++ = MBO_ATTR_ID_ASSOC_DISALLOW;
 538                 *mbo_pos++ = 1;
 539                 *mbo_pos++ = hapd->mbo_assoc_disallow;
 540         }
 541
 542         pos += mbo_add_ie(pos, len, mbo, mbo_pos - mbo);
 543
 544         return pos;
 545 }
 546
 547
 548 u8 hostapd_mbo_ie_len(struct hostapd_data *hapd)
 549 {
 550         if (!hapd->conf->mbo_enabled)
 551                 return 0;
 552
 553         /*
 554          * MBO IE header (6) + Capability Indication attribute (3) +
 555          * Association Disallowed attribute (3) = 12
 556          */
 557         return 6 + 3 + (hapd->mbo_assoc_disallow ? 3 : 0);
 558 }
 559
 560 #endif /* CONFIG_MBO */