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