src/ap/beacon.c

   1 /*
   2  * hostapd / IEEE 802.11 Management: Beacon and Probe Request/Response
   3  * Copyright (c) 2002-2004, Instant802 Networks, Inc.
   4  * Copyright (c) 2005-2006, Devicescape Software, Inc.
   5  * Copyright (c) 2008-2012, Jouni Malinen <j@w1.fi>
   6  *
   7  * This software may be distributed under the terms of the BSD license.
   8  * See README for more details.
   9  */
  10
  11 #include "utils/includes.h"
  12
  13 #ifndef CONFIG_NATIVE_WINDOWS
  14
  15 #include "utils/common.h"
  16 #include "common/ieee802_11_defs.h"
  17 #include "common/ieee802_11_common.h"
  18 #include "wps/wps_defs.h"
  19 #include "p2p/p2p.h"
  20 #include "hostapd.h"
  21 #include "ieee802_11.h"
  22 #include "wpa_auth.h"
  23 #include "wmm.h"
  24 #include "ap_config.h"
  25 #include "sta_info.h"
  26 #include "p2p_hostapd.h"
  27 #include "ap_drv_ops.h"
  28 #include "beacon.h"
  29 #include "hs20.h"
  30 #include "dfs.h"
  31
  32
  33 #ifdef NEED_AP_MLME
  34
  35 static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len)
  36 {
  37 #ifdef CONFIG_TESTING_OPTIONS
  38         if (hapd->conf->bss_load_test_set) {
  39                 if (2 + 5 > len)
  40                         return eid;
  41                 *eid++ = WLAN_EID_BSS_LOAD;
  42                 *eid++ = 5;
  43                 os_memcpy(eid, hapd->conf->bss_load_test, 5);
  44                 eid += 5;
  45         }
  46 #endif /* CONFIG_TESTING_OPTIONS */
  47         return eid;
  48 }
  49
  50
  51 static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
  52 {
  53         u8 erp = 0;
  54
  55         if (hapd->iface->current_mode == NULL ||
  56             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  57                 return 0;
  58
  59         if (hapd->iface->olbc)
  60                 erp |= ERP_INFO_USE_PROTECTION;
  61         if (hapd->iface->num_sta_non_erp > 0) {
  62                 erp |= ERP_INFO_NON_ERP_PRESENT |
  63                         ERP_INFO_USE_PROTECTION;
  64         }
  65         if (hapd->iface->num_sta_no_short_preamble > 0 ||
  66             hapd->iconf->preamble == LONG_PREAMBLE)
  67                 erp |= ERP_INFO_BARKER_PREAMBLE_MODE;
  68
  69         return erp;
  70 }
  71
  72
  73 static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid)
  74 {
  75         *eid++ = WLAN_EID_DS_PARAMS;
  76         *eid++ = 1;
  77         *eid++ = hapd->iconf->channel;
  78         return eid;
  79 }
  80
  81
  82 static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
  83 {
  84         if (hapd->iface->current_mode == NULL ||
  85             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  86                 return eid;
  87
  88         /* Set NonERP_present and use_protection bits if there
  89          * are any associated NonERP stations. */
  90         /* TODO: use_protection bit can be set to zero even if
  91          * there are NonERP stations present. This optimization
  92          * might be useful if NonERP stations are "quiet".
  93          * See 802.11g/D6 E-1 for recommended practice.
  94          * In addition, Non ERP present might be set, if AP detects Non ERP
  95          * operation on other APs. */
  96
  97         /* Add ERP Information element */
  98         *eid++ = WLAN_EID_ERP_INFO;
  99         *eid++ = 1;
 100         *eid++ = ieee802_11_erp_info(hapd);
 101
 102         return eid;
 103 }
 104
 105
 106 static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid)
 107 {
 108         u8 *pos = eid;
 109         u8 local_pwr_constraint = 0;
 110         int dfs;
 111
 112         if (hapd->iface->current_mode == NULL ||
 113             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
 114                 return eid;
 115
 116         /* Let host drivers add this IE if DFS support is offloaded */
 117         if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
 118                 return eid;
 119
 120         /*
 121          * There is no DFS support and power constraint was not directly
 122          * requested by config option.
 123          */
 124         if (!hapd->iconf->ieee80211h &&
 125             hapd->iconf->local_pwr_constraint == -1)
 126                 return eid;
 127
 128         /* Check if DFS is required by regulatory. */
 129         dfs = hostapd_is_dfs_required(hapd->iface);
 130         if (dfs < 0) {
 131                 wpa_printf(MSG_WARNING, "Failed to check if DFS is required; ret=%d",
 132                            dfs);
 133                 dfs = 0;
 134         }
 135
 136         if (dfs == 0 && hapd->iconf->local_pwr_constraint == -1)
 137                 return eid;
 138
 139         /*
 140          * ieee80211h (DFS) is enabled so Power Constraint element shall
 141          * be added when running on DFS channel whenever local_pwr_constraint
 142          * is configured or not. In order to meet regulations when TPC is not
 143          * implemented using a transmit power that is below the legal maximum
 144          * (including any mitigation factor) should help. In this case,
 145          * indicate 3 dB below maximum allowed transmit power.
 146          */
 147         if (hapd->iconf->local_pwr_constraint == -1)
 148                 local_pwr_constraint = 3;
 149
 150         /*
 151          * A STA that is not an AP shall use a transmit power less than or
 152          * equal to the local maximum transmit power level for the channel.
 153          * The local maximum transmit power can be calculated from the formula:
 154          * local max TX pwr = max TX pwr - local pwr constraint
 155          * Where max TX pwr is maximum transmit power level specified for
 156          * channel in Country element and local pwr constraint is specified
 157          * for channel in this Power Constraint element.
 158          */
 159
 160         /* Element ID */
 161         *pos++ = WLAN_EID_PWR_CONSTRAINT;
 162         /* Length */
 163         *pos++ = 1;
 164         /* Local Power Constraint */
 165         if (local_pwr_constraint)
 166                 *pos++ = local_pwr_constraint;
 167         else
 168                 *pos++ = hapd->iconf->local_pwr_constraint;
 169
 170         return pos;
 171 }
 172
 173
 174 static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing,
 175                                     struct hostapd_channel_data *start,
 176                                     struct hostapd_channel_data *prev)
 177 {
 178         if (end - pos < 3)
 179                 return pos;
 180
 181         /* first channel number */
 182         *pos++ = start->chan;
 183         /* number of channels */
 184         *pos++ = (prev->chan - start->chan) / chan_spacing + 1;
 185         /* maximum transmit power level */
 186         *pos++ = start->max_tx_power;
 187
 188         return pos;
 189 }
 190
 191
 192 static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
 193                                 int max_len)
 194 {
 195         u8 *pos = eid;
 196         u8 *end = eid + max_len;
 197         int i;
 198         struct hostapd_hw_modes *mode;
 199         struct hostapd_channel_data *start, *prev;
 200         int chan_spacing = 1;
 201
 202         if (!hapd->iconf->ieee80211d || max_len < 6 ||
 203             hapd->iface->current_mode == NULL)
 204                 return eid;
 205
 206         *pos++ = WLAN_EID_COUNTRY;
 207         pos++; /* length will be set later */
 208         os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
 209         pos += 3;
 210
 211         mode = hapd->iface->current_mode;
 212         if (mode->mode == HOSTAPD_MODE_IEEE80211A)
 213                 chan_spacing = 4;
 214
 215         start = prev = NULL;
 216         for (i = 0; i < mode->num_channels; i++) {
 217                 struct hostapd_channel_data *chan = &mode->channels[i];
 218                 if (chan->flag & HOSTAPD_CHAN_DISABLED)
 219                         continue;
 220                 if (start && prev &&
 221                     prev->chan + chan_spacing == chan->chan &&
 222                     start->max_tx_power == chan->max_tx_power) {
 223                         prev = chan;
 224                         continue; /* can use same entry */
 225                 }
 226
 227                 if (start && prev) {
 228                         pos = hostapd_eid_country_add(pos, end, chan_spacing,
 229                                                       start, prev);
 230                         start = NULL;
 231                 }
 232
 233                 /* Start new group */
 234                 start = prev = chan;
 235         }
 236
 237         if (start) {
 238                 pos = hostapd_eid_country_add(pos, end, chan_spacing,
 239                                               start, prev);
 240         }
 241
 242         if ((pos - eid) & 1) {
 243                 if (end - pos < 1)
 244                         return eid;
 245                 *pos++ = 0; /* pad for 16-bit alignment */
 246         }
 247
 248         eid[1] = (pos - eid) - 2;
 249
 250         return pos;
 251 }
 252
 253
 254 static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len)
 255 {
 256         const u8 *ie;
 257         size_t ielen;
 258
 259         ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
 260         if (ie == NULL || ielen > len)
 261                 return eid;
 262
 263         os_memcpy(eid, ie, ielen);
 264         return eid + ielen;
 265 }
 266
 267
 268 static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid)
 269 {
 270         u8 chan;
 271
 272         if (!hapd->cs_freq_params.freq)
 273                 return eid;
 274
 275         if (ieee80211_freq_to_chan(hapd->cs_freq_params.freq, &chan) ==
 276             NUM_HOSTAPD_MODES)
 277                 return eid;
 278
 279         *eid++ = WLAN_EID_CHANNEL_SWITCH;
 280         *eid++ = 3;
 281         *eid++ = hapd->cs_block_tx;
 282         *eid++ = chan;
 283         *eid++ = hapd->cs_count;
 284
 285         return eid;
 286 }
 287
 288
 289 static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid)
 290 {
 291         u8 sec_ch;
 292
 293         if (!hapd->cs_freq_params.sec_channel_offset)
 294                 return eid;
 295
 296         if (hapd->cs_freq_params.sec_channel_offset == -1)
 297                 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW;
 298         else if (hapd->cs_freq_params.sec_channel_offset == 1)
 299                 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE;
 300         else
 301                 return eid;
 302
 303         *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
 304         *eid++ = 1;
 305         *eid++ = sec_ch;
 306
 307         return eid;
 308 }
 309
 310
 311 static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos,
 312                                   u8 *start, unsigned int *csa_counter_off)
 313 {
 314         u8 *old_pos = pos;
 315
 316         if (!csa_counter_off)
 317                 return pos;
 318
 319         *csa_counter_off = 0;
 320         pos = hostapd_eid_csa(hapd, pos);
 321
 322         if (pos != old_pos) {
 323                 /* save an offset to the counter - should be last byte */
 324                 *csa_counter_off = pos - start - 1;
 325                 pos = hostapd_eid_secondary_channel(hapd, pos);
 326         }
 327
 328         return pos;
 329 }
 330
 331
 332 static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 333                                    struct sta_info *sta,
 334                                    const struct ieee80211_mgmt *req,
 335                                    int is_p2p, size_t *resp_len)
 336 {
 337         struct ieee80211_mgmt *resp;
 338         u8 *pos, *epos;
 339         size_t buflen;
 340
 341 #define MAX_PROBERESP_LEN 768
 342         buflen = MAX_PROBERESP_LEN;
 343 #ifdef CONFIG_WPS
 344         if (hapd->wps_probe_resp_ie)
 345                 buflen += wpabuf_len(hapd->wps_probe_resp_ie);
 346 #endif /* CONFIG_WPS */
 347 #ifdef CONFIG_P2P
 348         if (hapd->p2p_probe_resp_ie)
 349                 buflen += wpabuf_len(hapd->p2p_probe_resp_ie);
 350 #endif /* CONFIG_P2P */
 351         if (hapd->conf->vendor_elements)
 352                 buflen += wpabuf_len(hapd->conf->vendor_elements);
 353         resp = os_zalloc(buflen);
 354         if (resp == NULL)
 355                 return NULL;
 356
 357         epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
 358
 359         resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 360                                            WLAN_FC_STYPE_PROBE_RESP);
 361         if (req)
 362                 os_memcpy(resp->da, req->sa, ETH_ALEN);
 363         os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
 364
 365         os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
 366         resp->u.probe_resp.beacon_int =
 367                 host_to_le16(hapd->iconf->beacon_int);
 368
 369         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 370         resp->u.probe_resp.capab_info =
 371                 host_to_le16(hostapd_own_capab_info(hapd, sta, 1));
 372
 373         pos = resp->u.probe_resp.variable;
 374         *pos++ = WLAN_EID_SSID;
 375         *pos++ = hapd->conf->ssid.ssid_len;
 376         os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len);
 377         pos += hapd->conf->ssid.ssid_len;
 378
 379         /* Supported rates */
 380         pos = hostapd_eid_supp_rates(hapd, pos);
 381
 382         /* DS Params */
 383         pos = hostapd_eid_ds_params(hapd, pos);
 384
 385         pos = hostapd_eid_country(hapd, pos, epos - pos);
 386
 387         /* Power Constraint element */
 388         pos = hostapd_eid_pwr_constraint(hapd, pos);
 389
 390         /* ERP Information element */
 391         pos = hostapd_eid_erp_info(hapd, pos);
 392
 393         /* Extended supported rates */
 394         pos = hostapd_eid_ext_supp_rates(hapd, pos);
 395
 396         /* RSN, MDIE, WPA */
 397         pos = hostapd_eid_wpa(hapd, pos, epos - pos);
 398
 399         pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
 400
 401 #ifdef CONFIG_IEEE80211N
 402         pos = hostapd_eid_ht_capabilities(hapd, pos);
 403         pos = hostapd_eid_ht_operation(hapd, pos);
 404 #endif /* CONFIG_IEEE80211N */
 405
 406         pos = hostapd_eid_ext_capab(hapd, pos);
 407
 408         pos = hostapd_eid_time_adv(hapd, pos);
 409         pos = hostapd_eid_time_zone(hapd, pos);
 410
 411         pos = hostapd_eid_interworking(hapd, pos);
 412         pos = hostapd_eid_adv_proto(hapd, pos);
 413         pos = hostapd_eid_roaming_consortium(hapd, pos);
 414
 415         pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp,
 416                                     &hapd->cs_c_off_proberesp);
 417 #ifdef CONFIG_IEEE80211AC
 418         pos = hostapd_eid_vht_capabilities(hapd, pos);
 419         pos = hostapd_eid_vht_operation(hapd, pos);
 420 #endif /* CONFIG_IEEE80211AC */
 421
 422         /* Wi-Fi Alliance WMM */
 423         pos = hostapd_eid_wmm(hapd, pos);
 424
 425 #ifdef CONFIG_WPS
 426         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
 427                 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
 428                           wpabuf_len(hapd->wps_probe_resp_ie));
 429                 pos += wpabuf_len(hapd->wps_probe_resp_ie);
 430         }
 431 #endif /* CONFIG_WPS */
 432
 433 #ifdef CONFIG_P2P
 434         if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
 435             hapd->p2p_probe_resp_ie) {
 436                 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
 437                           wpabuf_len(hapd->p2p_probe_resp_ie));
 438                 pos += wpabuf_len(hapd->p2p_probe_resp_ie);
 439         }
 440 #endif /* CONFIG_P2P */
 441 #ifdef CONFIG_P2P_MANAGER
 442         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 443             P2P_MANAGE)
 444                 pos = hostapd_eid_p2p_manage(hapd, pos);
 445 #endif /* CONFIG_P2P_MANAGER */
 446
 447 #ifdef CONFIG_HS20
 448         pos = hostapd_eid_hs20_indication(hapd, pos);
 449         pos = hostapd_eid_osen(hapd, pos);
 450 #endif /* CONFIG_HS20 */
 451
 452         if (hapd->conf->vendor_elements) {
 453                 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
 454                           wpabuf_len(hapd->conf->vendor_elements));
 455                 pos += wpabuf_len(hapd->conf->vendor_elements);
 456         }
 457
 458         *resp_len = pos - (u8 *) resp;
 459         return (u8 *) resp;
 460 }
 461
 462
 463 enum ssid_match_result {
 464         NO_SSID_MATCH,
 465         EXACT_SSID_MATCH,
 466         WILDCARD_SSID_MATCH
 467 };
 468
 469 static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
 470                                          const u8 *ssid, size_t ssid_len,
 471                                          const u8 *ssid_list,
 472                                          size_t ssid_list_len)
 473 {
 474         const u8 *pos, *end;
 475         int wildcard = 0;
 476
 477         if (ssid_len == 0)
 478                 wildcard = 1;
 479         if (ssid_len == hapd->conf->ssid.ssid_len &&
 480             os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
 481                 return EXACT_SSID_MATCH;
 482
 483         if (ssid_list == NULL)
 484                 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 485
 486         pos = ssid_list;
 487         end = ssid_list + ssid_list_len;
 488         while (pos + 1 <= end) {
 489                 if (pos + 2 + pos[1] > end)
 490                         break;
 491                 if (pos[1] == 0)
 492                         wildcard = 1;
 493                 if (pos[1] == hapd->conf->ssid.ssid_len &&
 494                     os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
 495                         return EXACT_SSID_MATCH;
 496                 pos += 2 + pos[1];
 497         }
 498
 499         return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 500 }
 501
 502
 503 void handle_probe_req(struct hostapd_data *hapd,
 504                       const struct ieee80211_mgmt *mgmt, size_t len,
 505                       int ssi_signal)
 506 {
 507         u8 *resp;
 508         struct ieee802_11_elems elems;
 509         const u8 *ie;
 510         size_t ie_len;
 511         struct sta_info *sta = NULL;
 512         size_t i, resp_len;
 513         int noack;
 514         enum ssid_match_result res;
 515
 516         ie = mgmt->u.probe_req.variable;
 517         if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
 518                 return;
 519         ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
 520
 521         for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
 522                 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
 523                                             mgmt->sa, mgmt->da, mgmt->bssid,
 524                                             ie, ie_len, ssi_signal) > 0)
 525                         return;
 526
 527         if (!hapd->iconf->send_probe_response)
 528                 return;
 529
 530         if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
 531                 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
 532                            MAC2STR(mgmt->sa));
 533                 return;
 534         }
 535
 536         if ((!elems.ssid || !elems.supp_rates)) {
 537                 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
 538                            "without SSID or supported rates element",
 539                            MAC2STR(mgmt->sa));
 540                 return;
 541         }
 542
 543 #ifdef CONFIG_P2P
 544         if (hapd->p2p && elems.wps_ie) {
 545                 struct wpabuf *wps;
 546                 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
 547                 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
 548                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 549                                    "due to mismatch with Requested Device "
 550                                    "Type");
 551                         wpabuf_free(wps);
 552                         return;
 553                 }
 554                 wpabuf_free(wps);
 555         }
 556
 557         if (hapd->p2p && elems.p2p) {
 558                 struct wpabuf *p2p;
 559                 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
 560                 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
 561                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 562                                    "due to mismatch with Device ID");
 563                         wpabuf_free(p2p);
 564                         return;
 565                 }
 566                 wpabuf_free(p2p);
 567         }
 568 #endif /* CONFIG_P2P */
 569
 570         if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
 571             elems.ssid_list_len == 0) {
 572                 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
 573                            "broadcast SSID ignored", MAC2STR(mgmt->sa));
 574                 return;
 575         }
 576
 577         sta = ap_get_sta(hapd, mgmt->sa);
 578
 579 #ifdef CONFIG_P2P
 580         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 581             elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
 582             os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
 583                       P2P_WILDCARD_SSID_LEN) == 0) {
 584                 /* Process P2P Wildcard SSID like Wildcard SSID */
 585                 elems.ssid_len = 0;
 586         }
 587 #endif /* CONFIG_P2P */
 588
 589         res = ssid_match(hapd, elems.ssid, elems.ssid_len,
 590                          elems.ssid_list, elems.ssid_list_len);
 591         if (res != NO_SSID_MATCH) {
 592                 if (sta)
 593                         sta->ssid_probe = &hapd->conf->ssid;
 594         } else {
 595                 if (!(mgmt->da[0] & 0x01)) {
 596                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 597                                    " for foreign SSID '%s' (DA " MACSTR ")%s",
 598                                    MAC2STR(mgmt->sa),
 599                                    wpa_ssid_txt(elems.ssid, elems.ssid_len),
 600                                    MAC2STR(mgmt->da),
 601                                    elems.ssid_list ? " (SSID list)" : "");
 602                 }
 603                 return;
 604         }
 605
 606 #ifdef CONFIG_INTERWORKING
 607         if (hapd->conf->interworking &&
 608             elems.interworking && elems.interworking_len >= 1) {
 609                 u8 ant = elems.interworking[0] & 0x0f;
 610                 if (ant != INTERWORKING_ANT_WILDCARD &&
 611                     ant != hapd->conf->access_network_type) {
 612                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 613                                    " for mismatching ANT %u ignored",
 614                                    MAC2STR(mgmt->sa), ant);
 615                         return;
 616                 }
 617         }
 618
 619         if (hapd->conf->interworking && elems.interworking &&
 620             (elems.interworking_len == 7 || elems.interworking_len == 9)) {
 621                 const u8 *hessid;
 622                 if (elems.interworking_len == 7)
 623                         hessid = elems.interworking + 1;
 624                 else
 625                         hessid = elems.interworking + 1 + 2;
 626                 if (!is_broadcast_ether_addr(hessid) &&
 627                     os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
 628                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 629                                    " for mismatching HESSID " MACSTR
 630                                    " ignored",
 631                                    MAC2STR(mgmt->sa), MAC2STR(hessid));
 632                         return;
 633                 }
 634         }
 635 #endif /* CONFIG_INTERWORKING */
 636
 637 #ifdef CONFIG_P2P
 638         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 639             supp_rates_11b_only(&elems)) {
 640                 /* Indicates support for 11b rates only */
 641                 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
 642                            MACSTR " with only 802.11b rates",
 643                            MAC2STR(mgmt->sa));
 644                 return;
 645         }
 646 #endif /* CONFIG_P2P */
 647
 648         /* TODO: verify that supp_rates contains at least one matching rate
 649          * with AP configuration */
 650
 651 #ifdef CONFIG_TESTING_OPTIONS
 652         if (hapd->iconf->ignore_probe_probability > 0.0 &&
 653             drand48() < hapd->iconf->ignore_probe_probability) {
 654                 wpa_printf(MSG_INFO,
 655                            "TESTING: ignoring probe request from " MACSTR,
 656                            MAC2STR(mgmt->sa));
 657                 return;
 658         }
 659 #endif /* CONFIG_TESTING_OPTIONS */
 660
 661         resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL,
 662                                       &resp_len);
 663         if (resp == NULL)
 664                 return;
 665
 666         /*
 667          * If this is a broadcast probe request, apply no ack policy to avoid
 668          * excessive retries.
 669          */
 670         noack = !!(res == WILDCARD_SSID_MATCH &&
 671                    is_broadcast_ether_addr(mgmt->da));
 672
 673         if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
 674                 wpa_printf(MSG_INFO, "handle_probe_req: send failed");
 675
 676         os_free(resp);
 677
 678         wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
 679                    "SSID", MAC2STR(mgmt->sa),
 680                    elems.ssid_len == 0 ? "broadcast" : "our");
 681 }
 682
 683
 684 static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
 685                                         size_t *resp_len)
 686 {
 687         /* check probe response offloading caps and print warnings */
 688         if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
 689                 return NULL;
 690
 691 #ifdef CONFIG_WPS
 692         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
 693             (!(hapd->iface->probe_resp_offloads &
 694                (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
 695                 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
 696                 wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
 697                            "Probe Response while not supporting this");
 698 #endif /* CONFIG_WPS */
 699
 700 #ifdef CONFIG_P2P
 701         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
 702             !(hapd->iface->probe_resp_offloads &
 703               WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
 704                 wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
 705                            "Probe Response while not supporting this");
 706 #endif  /* CONFIG_P2P */
 707
 708         if (hapd->conf->interworking &&
 709             !(hapd->iface->probe_resp_offloads &
 710               WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
 711                 wpa_printf(MSG_WARNING, "Device is trying to offload "
 712                            "Interworking Probe Response while not supporting "
 713                            "this");
 714
 715         /* Generate a Probe Response template for the non-P2P case */
 716         return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len);
 717 }
 718
 719 #endif /* NEED_AP_MLME */
 720
 721
 722 int ieee802_11_build_ap_params(struct hostapd_data *hapd,
 723                                struct wpa_driver_ap_params *params)
 724 {
 725         struct ieee80211_mgmt *head = NULL;
 726         u8 *tail = NULL;
 727         size_t head_len = 0, tail_len = 0;
 728         u8 *resp = NULL;
 729         size_t resp_len = 0;
 730 #ifdef NEED_AP_MLME
 731         u16 capab_info;
 732         u8 *pos, *tailpos;
 733
 734 #define BEACON_HEAD_BUF_SIZE 256
 735 #define BEACON_TAIL_BUF_SIZE 512
 736         head = os_zalloc(BEACON_HEAD_BUF_SIZE);
 737         tail_len = BEACON_TAIL_BUF_SIZE;
 738 #ifdef CONFIG_WPS
 739         if (hapd->conf->wps_state && hapd->wps_beacon_ie)
 740                 tail_len += wpabuf_len(hapd->wps_beacon_ie);
 741 #endif /* CONFIG_WPS */
 742 #ifdef CONFIG_P2P
 743         if (hapd->p2p_beacon_ie)
 744                 tail_len += wpabuf_len(hapd->p2p_beacon_ie);
 745 #endif /* CONFIG_P2P */
 746         if (hapd->conf->vendor_elements)
 747                 tail_len += wpabuf_len(hapd->conf->vendor_elements);
 748         tailpos = tail = os_malloc(tail_len);
 749         if (head == NULL || tail == NULL) {
 750                 wpa_printf(MSG_ERROR, "Failed to set beacon data");
 751                 os_free(head);
 752                 os_free(tail);
 753                 return -1;
 754         }
 755
 756         head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 757                                            WLAN_FC_STYPE_BEACON);
 758         head->duration = host_to_le16(0);
 759         os_memset(head->da, 0xff, ETH_ALEN);
 760
 761         os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
 762         os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
 763         head->u.beacon.beacon_int =
 764                 host_to_le16(hapd->iconf->beacon_int);
 765
 766         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 767         capab_info = hostapd_own_capab_info(hapd, NULL, 0);
 768         head->u.beacon.capab_info = host_to_le16(capab_info);
 769         pos = &head->u.beacon.variable[0];
 770
 771         /* SSID */
 772         *pos++ = WLAN_EID_SSID;
 773         if (hapd->conf->ignore_broadcast_ssid == 2) {
 774                 /* clear the data, but keep the correct length of the SSID */
 775                 *pos++ = hapd->conf->ssid.ssid_len;
 776                 os_memset(pos, 0, hapd->conf->ssid.ssid_len);
 777                 pos += hapd->conf->ssid.ssid_len;
 778         } else if (hapd->conf->ignore_broadcast_ssid) {
 779                 *pos++ = 0; /* empty SSID */
 780         } else {
 781                 *pos++ = hapd->conf->ssid.ssid_len;
 782                 os_memcpy(pos, hapd->conf->ssid.ssid,
 783                           hapd->conf->ssid.ssid_len);
 784                 pos += hapd->conf->ssid.ssid_len;
 785         }
 786
 787         /* Supported rates */
 788         pos = hostapd_eid_supp_rates(hapd, pos);
 789
 790         /* DS Params */
 791         pos = hostapd_eid_ds_params(hapd, pos);
 792
 793         head_len = pos - (u8 *) head;
 794
 795         tailpos = hostapd_eid_country(hapd, tailpos,
 796                                       tail + BEACON_TAIL_BUF_SIZE - tailpos);
 797
 798         /* Power Constraint element */
 799         tailpos = hostapd_eid_pwr_constraint(hapd, tailpos);
 800
 801         /* ERP Information element */
 802         tailpos = hostapd_eid_erp_info(hapd, tailpos);
 803
 804         /* Extended supported rates */
 805         tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
 806
 807         /* RSN, MDIE, WPA */
 808         tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
 809                                   tailpos);
 810
 811         tailpos = hostapd_eid_bss_load(hapd, tailpos,
 812                                        tail + BEACON_TAIL_BUF_SIZE - tailpos);
 813
 814 #ifdef CONFIG_IEEE80211N
 815         tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
 816         tailpos = hostapd_eid_ht_operation(hapd, tailpos);
 817 #endif /* CONFIG_IEEE80211N */
 818
 819         tailpos = hostapd_eid_ext_capab(hapd, tailpos);
 820
 821         /*
 822          * TODO: Time Advertisement element should only be included in some
 823          * DTIM Beacon frames.
 824          */
 825         tailpos = hostapd_eid_time_adv(hapd, tailpos);
 826
 827         tailpos = hostapd_eid_interworking(hapd, tailpos);
 828         tailpos = hostapd_eid_adv_proto(hapd, tailpos);
 829         tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
 830         tailpos = hostapd_add_csa_elems(hapd, tailpos, tail,
 831                                         &hapd->cs_c_off_beacon);
 832 #ifdef CONFIG_IEEE80211AC
 833         tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
 834         tailpos = hostapd_eid_vht_operation(hapd, tailpos);
 835 #endif /* CONFIG_IEEE80211AC */
 836
 837         /* Wi-Fi Alliance WMM */
 838         tailpos = hostapd_eid_wmm(hapd, tailpos);
 839
 840 #ifdef CONFIG_WPS
 841         if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
 842                 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
 843                           wpabuf_len(hapd->wps_beacon_ie));
 844                 tailpos += wpabuf_len(hapd->wps_beacon_ie);
 845         }
 846 #endif /* CONFIG_WPS */
 847
 848 #ifdef CONFIG_P2P
 849         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
 850                 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
 851                           wpabuf_len(hapd->p2p_beacon_ie));
 852                 tailpos += wpabuf_len(hapd->p2p_beacon_ie);
 853         }
 854 #endif /* CONFIG_P2P */
 855 #ifdef CONFIG_P2P_MANAGER
 856         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 857             P2P_MANAGE)
 858                 tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
 859 #endif /* CONFIG_P2P_MANAGER */
 860
 861 #ifdef CONFIG_HS20
 862         tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
 863         tailpos = hostapd_eid_osen(hapd, tailpos);
 864 #endif /* CONFIG_HS20 */
 865
 866         if (hapd->conf->vendor_elements) {
 867                 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
 868                           wpabuf_len(hapd->conf->vendor_elements));
 869                 tailpos += wpabuf_len(hapd->conf->vendor_elements);
 870         }
 871
 872         tail_len = tailpos > tail ? tailpos - tail : 0;
 873
 874         resp = hostapd_probe_resp_offloads(hapd, &resp_len);
 875 #endif /* NEED_AP_MLME */
 876
 877         os_memset(params, 0, sizeof(*params));
 878         params->head = (u8 *) head;
 879         params->head_len = head_len;
 880         params->tail = tail;
 881         params->tail_len = tail_len;
 882         params->proberesp = resp;
 883         params->proberesp_len = resp_len;
 884         params->dtim_period = hapd->conf->dtim_period;
 885         params->beacon_int = hapd->iconf->beacon_int;
 886         params->basic_rates = hapd->iface->basic_rates;
 887         params->ssid = hapd->conf->ssid.ssid;
 888         params->ssid_len = hapd->conf->ssid.ssid_len;
 889         params->pairwise_ciphers = hapd->conf->wpa_pairwise |
 890                 hapd->conf->rsn_pairwise;
 891         params->group_cipher = hapd->conf->wpa_group;
 892         params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
 893         params->auth_algs = hapd->conf->auth_algs;
 894         params->wpa_version = hapd->conf->wpa;
 895         params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
 896                 (hapd->conf->ieee802_1x &&
 897                  (hapd->conf->default_wep_key_len ||
 898                   hapd->conf->individual_wep_key_len));
 899         switch (hapd->conf->ignore_broadcast_ssid) {
 900         case 0:
 901                 params->hide_ssid = NO_SSID_HIDING;
 902                 break;
 903         case 1:
 904                 params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
 905                 break;
 906         case 2:
 907                 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
 908                 break;
 909         }
 910         params->isolate = hapd->conf->isolate;
 911 #ifdef NEED_AP_MLME
 912         params->cts_protect = !!(ieee802_11_erp_info(hapd) &
 913                                 ERP_INFO_USE_PROTECTION);
 914         params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
 915                 hapd->iconf->preamble == SHORT_PREAMBLE;
 916         if (hapd->iface->current_mode &&
 917             hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
 918                 params->short_slot_time =
 919                         hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
 920         else
 921                 params->short_slot_time = -1;
 922         if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
 923                 params->ht_opmode = -1;
 924         else
 925                 params->ht_opmode = hapd->iface->ht_op_mode;
 926 #endif /* NEED_AP_MLME */
 927         params->interworking = hapd->conf->interworking;
 928         if (hapd->conf->interworking &&
 929             !is_zero_ether_addr(hapd->conf->hessid))
 930                 params->hessid = hapd->conf->hessid;
 931         params->access_network_type = hapd->conf->access_network_type;
 932         params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
 933 #ifdef CONFIG_HS20
 934         params->disable_dgaf = hapd->conf->disable_dgaf;
 935         if (hapd->conf->osen) {
 936                 params->privacy = 1;
 937                 params->osen = 1;
 938         }
 939 #endif /* CONFIG_HS20 */
 940         return 0;
 941 }
 942
 943
 944 void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
 945 {
 946         os_free(params->tail);
 947         params->tail = NULL;
 948         os_free(params->head);
 949         params->head = NULL;
 950         os_free(params->proberesp);
 951         params->proberesp = NULL;
 952 }
 953
 954
 955 int ieee802_11_set_beacon(struct hostapd_data *hapd)
 956 {
 957         struct wpa_driver_ap_params params;
 958         struct hostapd_freq_params freq;
 959         struct hostapd_iface *iface = hapd->iface;
 960         struct hostapd_config *iconf = iface->conf;
 961         struct wpabuf *beacon, *proberesp, *assocresp;
 962         int res, ret = -1;
 963
 964         if (hapd->csa_in_progress) {
 965                 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
 966                 return -1;
 967         }
 968
 969         hapd->beacon_set_done = 1;
 970
 971         if (ieee802_11_build_ap_params(hapd, &params) < 0)
 972                 return -1;
 973
 974         if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
 975             0)
 976                 goto fail;
 977
 978         params.beacon_ies = beacon;
 979         params.proberesp_ies = proberesp;
 980         params.assocresp_ies = assocresp;
 981
 982         if (iface->current_mode &&
 983             hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq,
 984                                     iconf->channel, iconf->ieee80211n,
 985                                     iconf->ieee80211ac,
 986                                     iconf->secondary_channel,
 987                                     iconf->vht_oper_chwidth,
 988                                     iconf->vht_oper_centr_freq_seg0_idx,
 989                                     iconf->vht_oper_centr_freq_seg1_idx,
 990                                     iface->current_mode->vht_capab) == 0)
 991                 params.freq = &freq;
 992
 993         res = hostapd_drv_set_ap(hapd, &params);
 994         hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
 995         if (res)
 996                 wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
 997         else
 998                 ret = 0;
 999 fail:
1000         ieee802_11_free_ap_params(&params);
1001         return ret;
1002 }
1003
1004
1005 int ieee802_11_set_beacons(struct hostapd_iface *iface)
1006 {
1007         size_t i;
1008         int ret = 0;
1009
1010         for (i = 0; i < iface->num_bss; i++) {
1011                 if (iface->bss[i]->started &&
1012                     ieee802_11_set_beacon(iface->bss[i]) < 0)
1013                         ret = -1;
1014         }
1015
1016         return ret;
1017 }
1018
1019
1020 /* only update beacons if started */
1021 int ieee802_11_update_beacons(struct hostapd_iface *iface)
1022 {
1023         size_t i;
1024         int ret = 0;
1025
1026         for (i = 0; i < iface->num_bss; i++) {
1027                 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started &&
1028                     ieee802_11_set_beacon(iface->bss[i]) < 0)
1029                         ret = -1;
1030         }
1031
1032         return ret;
1033 }
1034
1035 #endif /* CONFIG_NATIVE_WINDOWS */