contrib/wpa/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_time now, passed;
  28
  29         *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
  30         *pos++ = 5;
  31         *pos++ = WLAN_TIMEOUT_ASSOC_COMEBACK;
  32         os_get_time(&now);
  33         os_time_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                 perror("ieee802_11_send_sa_query_req: send");
  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                 perror("ieee80211_mgmt_sa_query_request: send");
 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 u8 * hostapd_eid_ext_capab(struct hostapd_data *hapd, u8 *eid)
 168 {
 169         u8 *pos = eid;
 170         u8 len = 0;
 171
 172         if (hapd->conf->tdls & (TDLS_PROHIBIT | TDLS_PROHIBIT_CHAN_SWITCH))
 173                 len = 5;
 174         if (len < 4 && hapd->conf->interworking)
 175                 len = 4;
 176         if (len < 3 && hapd->conf->wnm_sleep_mode)
 177                 len = 3;
 178         if (len < 7 && hapd->conf->ssid.utf8_ssid)
 179                 len = 7;
 180 #ifdef CONFIG_WNM
 181         if (len < 4)
 182                 len = 4;
 183 #endif /* CONFIG_WNM */
 184         if (len == 0)
 185                 return eid;
 186
 187         *pos++ = WLAN_EID_EXT_CAPAB;
 188         *pos++ = len;
 189         *pos++ = 0x00;
 190         *pos++ = 0x00;
 191
 192         *pos = 0x00;
 193         if (hapd->conf->wnm_sleep_mode)
 194                 *pos |= 0x02; /* Bit 17 - WNM-Sleep Mode */
 195         if (hapd->conf->bss_transition)
 196                 *pos |= 0x08; /* Bit 19 - BSS Transition */
 197         pos++;
 198
 199         if (len < 4)
 200                 return pos;
 201         *pos = 0x00;
 202 #ifdef CONFIG_WNM
 203         *pos |= 0x02; /* Bit 25 - SSID List */
 204 #endif /* CONFIG_WNM */
 205         if (hapd->conf->time_advertisement == 2)
 206                 *pos |= 0x08; /* Bit 27 - UTC TSF Offset */
 207         if (hapd->conf->interworking)
 208                 *pos |= 0x80; /* Bit 31 - Interworking */
 209         pos++;
 210
 211         if (len < 5)
 212                 return pos;
 213         *pos = 0x00;
 214         if (hapd->conf->tdls & TDLS_PROHIBIT)
 215                 *pos |= 0x40; /* Bit 38 - TDLS Prohibited */
 216         if (hapd->conf->tdls & TDLS_PROHIBIT_CHAN_SWITCH)
 217                 *pos |= 0x80; /* Bit 39 - TDLS Channel Switching Prohibited */
 218         pos++;
 219
 220         if (len < 6)
 221                 return pos;
 222         *pos = 0x00;
 223         pos++;
 224
 225         if (len < 7)
 226                 return pos;
 227         *pos = 0x00;
 228         if (hapd->conf->ssid.utf8_ssid)
 229                 *pos |= 0x01; /* Bit 48 - UTF-8 SSID */
 230         pos++;
 231
 232         return pos;
 233 }
 234
 235
 236 u8 * hostapd_eid_interworking(struct hostapd_data *hapd, u8 *eid)
 237 {
 238         u8 *pos = eid;
 239 #ifdef CONFIG_INTERWORKING
 240         u8 *len;
 241
 242         if (!hapd->conf->interworking)
 243                 return eid;
 244
 245         *pos++ = WLAN_EID_INTERWORKING;
 246         len = pos++;
 247
 248         *pos = hapd->conf->access_network_type;
 249         if (hapd->conf->internet)
 250                 *pos |= INTERWORKING_ANO_INTERNET;
 251         if (hapd->conf->asra)
 252                 *pos |= INTERWORKING_ANO_ASRA;
 253         if (hapd->conf->esr)
 254                 *pos |= INTERWORKING_ANO_ESR;
 255         if (hapd->conf->uesa)
 256                 *pos |= INTERWORKING_ANO_UESA;
 257         pos++;
 258
 259         if (hapd->conf->venue_info_set) {
 260                 *pos++ = hapd->conf->venue_group;
 261                 *pos++ = hapd->conf->venue_type;
 262         }
 263
 264         if (!is_zero_ether_addr(hapd->conf->hessid)) {
 265                 os_memcpy(pos, hapd->conf->hessid, ETH_ALEN);
 266                 pos += ETH_ALEN;
 267         }
 268
 269         *len = pos - len - 1;
 270 #endif /* CONFIG_INTERWORKING */
 271
 272         return pos;
 273 }
 274
 275
 276 u8 * hostapd_eid_adv_proto(struct hostapd_data *hapd, u8 *eid)
 277 {
 278         u8 *pos = eid;
 279 #ifdef CONFIG_INTERWORKING
 280
 281         /* TODO: Separate configuration for ANQP? */
 282         if (!hapd->conf->interworking)
 283                 return eid;
 284
 285         *pos++ = WLAN_EID_ADV_PROTO;
 286         *pos++ = 2;
 287         *pos++ = 0x7F; /* Query Response Length Limit | PAME-BI */
 288         *pos++ = ACCESS_NETWORK_QUERY_PROTOCOL;
 289 #endif /* CONFIG_INTERWORKING */
 290
 291         return pos;
 292 }
 293
 294
 295 u8 * hostapd_eid_roaming_consortium(struct hostapd_data *hapd, u8 *eid)
 296 {
 297         u8 *pos = eid;
 298 #ifdef CONFIG_INTERWORKING
 299         u8 *len;
 300         unsigned int i, count;
 301
 302         if (!hapd->conf->interworking ||
 303             hapd->conf->roaming_consortium == NULL ||
 304             hapd->conf->roaming_consortium_count == 0)
 305                 return eid;
 306
 307         *pos++ = WLAN_EID_ROAMING_CONSORTIUM;
 308         len = pos++;
 309
 310         /* Number of ANQP OIs (in addition to the max 3 listed here) */
 311         if (hapd->conf->roaming_consortium_count > 3 + 255)
 312                 *pos++ = 255;
 313         else if (hapd->conf->roaming_consortium_count > 3)
 314                 *pos++ = hapd->conf->roaming_consortium_count - 3;
 315         else
 316                 *pos++ = 0;
 317
 318         /* OU #1 and #2 Lengths */
 319         *pos = hapd->conf->roaming_consortium[0].len;
 320         if (hapd->conf->roaming_consortium_count > 1)
 321                 *pos |= hapd->conf->roaming_consortium[1].len << 4;
 322         pos++;
 323
 324         if (hapd->conf->roaming_consortium_count > 3)
 325                 count = 3;
 326         else
 327                 count = hapd->conf->roaming_consortium_count;
 328
 329         for (i = 0; i < count; i++) {
 330                 os_memcpy(pos, hapd->conf->roaming_consortium[i].oi,
 331                           hapd->conf->roaming_consortium[i].len);
 332                 pos += hapd->conf->roaming_consortium[i].len;
 333         }
 334
 335         *len = pos - len - 1;
 336 #endif /* CONFIG_INTERWORKING */
 337
 338         return pos;
 339 }
 340
 341
 342 u8 * hostapd_eid_time_adv(struct hostapd_data *hapd, u8 *eid)
 343 {
 344         if (hapd->conf->time_advertisement != 2)
 345                 return eid;
 346
 347         if (hapd->time_adv == NULL &&
 348             hostapd_update_time_adv(hapd) < 0)
 349                 return eid;
 350
 351         if (hapd->time_adv == NULL)
 352                 return eid;
 353
 354         os_memcpy(eid, wpabuf_head(hapd->time_adv),
 355                   wpabuf_len(hapd->time_adv));
 356         eid += wpabuf_len(hapd->time_adv);
 357
 358         return eid;
 359 }
 360
 361
 362 u8 * hostapd_eid_time_zone(struct hostapd_data *hapd, u8 *eid)
 363 {
 364         size_t len;
 365
 366         if (hapd->conf->time_advertisement != 2)
 367                 return eid;
 368
 369         len = os_strlen(hapd->conf->time_zone);
 370
 371         *eid++ = WLAN_EID_TIME_ZONE;
 372         *eid++ = len;
 373         os_memcpy(eid, hapd->conf->time_zone, len);
 374         eid += len;
 375
 376         return eid;
 377 }
 378
 379
 380 int hostapd_update_time_adv(struct hostapd_data *hapd)
 381 {
 382         const int elen = 2 + 1 + 10 + 5 + 1;
 383         struct os_time t;
 384         struct os_tm tm;
 385         u8 *pos;
 386
 387         if (hapd->conf->time_advertisement != 2)
 388                 return 0;
 389
 390         if (os_get_time(&t) < 0 || os_gmtime(t.sec, &tm) < 0)
 391                 return -1;
 392
 393         if (!hapd->time_adv) {
 394                 hapd->time_adv = wpabuf_alloc(elen);
 395                 if (hapd->time_adv == NULL)
 396                         return -1;
 397                 pos = wpabuf_put(hapd->time_adv, elen);
 398         } else
 399                 pos = wpabuf_mhead_u8(hapd->time_adv);
 400
 401         *pos++ = WLAN_EID_TIME_ADVERTISEMENT;
 402         *pos++ = 1 + 10 + 5 + 1;
 403
 404         *pos++ = 2; /* UTC time at which the TSF timer is 0 */
 405
 406         /* Time Value at TSF 0 */
 407         /* FIX: need to calculate this based on the current TSF value */
 408         WPA_PUT_LE16(pos, tm.year); /* Year */
 409         pos += 2;
 410         *pos++ = tm.month; /* Month */
 411         *pos++ = tm.day; /* Day of month */
 412         *pos++ = tm.hour; /* Hours */
 413         *pos++ = tm.min; /* Minutes */
 414         *pos++ = tm.sec; /* Seconds */
 415         WPA_PUT_LE16(pos, 0); /* Milliseconds (not used) */
 416         pos += 2;
 417         *pos++ = 0; /* Reserved */
 418
 419         /* Time Error */
 420         /* TODO: fill in an estimate on the error */
 421         *pos++ = 0;
 422         *pos++ = 0;
 423         *pos++ = 0;
 424         *pos++ = 0;
 425         *pos++ = 0;
 426
 427         *pos++ = hapd->time_update_counter++;
 428
 429         return 0;
 430 }
 431
 432
 433 u8 * hostapd_eid_bss_max_idle_period(struct hostapd_data *hapd, u8 *eid)
 434 {
 435         u8 *pos = eid;
 436
 437 #ifdef CONFIG_WNM
 438         if (hapd->conf->ap_max_inactivity > 0) {
 439                 unsigned int val;
 440                 *pos++ = WLAN_EID_BSS_MAX_IDLE_PERIOD;
 441                 *pos++ = 3;
 442                 val = hapd->conf->ap_max_inactivity;
 443                 if (val > 68000)
 444                         val = 68000;
 445                 val *= 1000;
 446                 val /= 1024;
 447                 if (val == 0)
 448                         val = 1;
 449                 if (val > 65535)
 450                         val = 65535;
 451                 WPA_PUT_LE16(pos, val);
 452                 pos += 2;
 453                 *pos++ = 0x00; /* TODO: Protected Keep-Alive Required */
 454         }
 455 #endif /* CONFIG_WNM */
 456
 457         return pos;
 458 }