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 "common/hw_features_common.h"
  19 #include "wps/wps_defs.h"
  20 #include "p2p/p2p.h"
  21 #include "hostapd.h"
  22 #include "ieee802_11.h"
  23 #include "wpa_auth.h"
  24 #include "wmm.h"
  25 #include "ap_config.h"
  26 #include "sta_info.h"
  27 #include "p2p_hostapd.h"
  28 #include "ap_drv_ops.h"
  29 #include "beacon.h"
  30 #include "hs20.h"
  31 #include "dfs.h"
  32
  33
  34 #ifdef NEED_AP_MLME
  35
  36 static u8 * hostapd_eid_rm_enabled_capab(struct hostapd_data *hapd, u8 *eid,
  37                                          size_t len)
  38 {
  39         if (!hapd->conf->radio_measurements || len < 2 + 4)
  40                 return eid;
  41
  42         *eid++ = WLAN_EID_RRM_ENABLED_CAPABILITIES;
  43         *eid++ = 5;
  44         *eid++ = (hapd->conf->radio_measurements & BIT(0)) ?
  45                 WLAN_RRM_CAPS_NEIGHBOR_REPORT : 0x00;
  46         *eid++ = 0x00;
  47         *eid++ = 0x00;
  48         *eid++ = 0x00;
  49         *eid++ = 0x00;
  50         return eid;
  51 }
  52
  53
  54 static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len)
  55 {
  56         if (len < 2 + 5)
  57                 return eid;
  58
  59 #ifdef CONFIG_TESTING_OPTIONS
  60         if (hapd->conf->bss_load_test_set) {
  61                 *eid++ = WLAN_EID_BSS_LOAD;
  62                 *eid++ = 5;
  63                 os_memcpy(eid, hapd->conf->bss_load_test, 5);
  64                 eid += 5;
  65                 return eid;
  66         }
  67 #endif /* CONFIG_TESTING_OPTIONS */
  68         if (hapd->conf->bss_load_update_period) {
  69                 *eid++ = WLAN_EID_BSS_LOAD;
  70                 *eid++ = 5;
  71                 WPA_PUT_LE16(eid, hapd->num_sta);
  72                 eid += 2;
  73                 *eid++ = hapd->iface->channel_utilization;
  74                 WPA_PUT_LE16(eid, 0); /* no available admission capabity */
  75                 eid += 2;
  76         }
  77         return eid;
  78 }
  79
  80
  81 static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
  82 {
  83         u8 erp = 0;
  84
  85         if (hapd->iface->current_mode == NULL ||
  86             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  87                 return 0;
  88
  89         if (hapd->iface->olbc)
  90                 erp |= ERP_INFO_USE_PROTECTION;
  91         if (hapd->iface->num_sta_non_erp > 0) {
  92                 erp |= ERP_INFO_NON_ERP_PRESENT |
  93                         ERP_INFO_USE_PROTECTION;
  94         }
  95         if (hapd->iface->num_sta_no_short_preamble > 0 ||
  96             hapd->iconf->preamble == LONG_PREAMBLE)
  97                 erp |= ERP_INFO_BARKER_PREAMBLE_MODE;
  98
  99         return erp;
 100 }
 101
 102
 103 static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid)
 104 {
 105         *eid++ = WLAN_EID_DS_PARAMS;
 106         *eid++ = 1;
 107         *eid++ = hapd->iconf->channel;
 108         return eid;
 109 }
 110
 111
 112 static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
 113 {
 114         if (hapd->iface->current_mode == NULL ||
 115             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
 116                 return eid;
 117
 118         /* Set NonERP_present and use_protection bits if there
 119          * are any associated NonERP stations. */
 120         /* TODO: use_protection bit can be set to zero even if
 121          * there are NonERP stations present. This optimization
 122          * might be useful if NonERP stations are "quiet".
 123          * See 802.11g/D6 E-1 for recommended practice.
 124          * In addition, Non ERP present might be set, if AP detects Non ERP
 125          * operation on other APs. */
 126
 127         /* Add ERP Information element */
 128         *eid++ = WLAN_EID_ERP_INFO;
 129         *eid++ = 1;
 130         *eid++ = ieee802_11_erp_info(hapd);
 131
 132         return eid;
 133 }
 134
 135
 136 static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid)
 137 {
 138         u8 *pos = eid;
 139         u8 local_pwr_constraint = 0;
 140         int dfs;
 141
 142         if (hapd->iface->current_mode == NULL ||
 143             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
 144                 return eid;
 145
 146         /* Let host drivers add this IE if DFS support is offloaded */
 147         if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
 148                 return eid;
 149
 150         /*
 151          * There is no DFS support and power constraint was not directly
 152          * requested by config option.
 153          */
 154         if (!hapd->iconf->ieee80211h &&
 155             hapd->iconf->local_pwr_constraint == -1)
 156                 return eid;
 157
 158         /* Check if DFS is required by regulatory. */
 159         dfs = hostapd_is_dfs_required(hapd->iface);
 160         if (dfs < 0) {
 161                 wpa_printf(MSG_WARNING, "Failed to check if DFS is required; ret=%d",
 162                            dfs);
 163                 dfs = 0;
 164         }
 165
 166         if (dfs == 0 && hapd->iconf->local_pwr_constraint == -1)
 167                 return eid;
 168
 169         /*
 170          * ieee80211h (DFS) is enabled so Power Constraint element shall
 171          * be added when running on DFS channel whenever local_pwr_constraint
 172          * is configured or not. In order to meet regulations when TPC is not
 173          * implemented using a transmit power that is below the legal maximum
 174          * (including any mitigation factor) should help. In this case,
 175          * indicate 3 dB below maximum allowed transmit power.
 176          */
 177         if (hapd->iconf->local_pwr_constraint == -1)
 178                 local_pwr_constraint = 3;
 179
 180         /*
 181          * A STA that is not an AP shall use a transmit power less than or
 182          * equal to the local maximum transmit power level for the channel.
 183          * The local maximum transmit power can be calculated from the formula:
 184          * local max TX pwr = max TX pwr - local pwr constraint
 185          * Where max TX pwr is maximum transmit power level specified for
 186          * channel in Country element and local pwr constraint is specified
 187          * for channel in this Power Constraint element.
 188          */
 189
 190         /* Element ID */
 191         *pos++ = WLAN_EID_PWR_CONSTRAINT;
 192         /* Length */
 193         *pos++ = 1;
 194         /* Local Power Constraint */
 195         if (local_pwr_constraint)
 196                 *pos++ = local_pwr_constraint;
 197         else
 198                 *pos++ = hapd->iconf->local_pwr_constraint;
 199
 200         return pos;
 201 }
 202
 203
 204 static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing,
 205                                     struct hostapd_channel_data *start,
 206                                     struct hostapd_channel_data *prev)
 207 {
 208         if (end - pos < 3)
 209                 return pos;
 210
 211         /* first channel number */
 212         *pos++ = start->chan;
 213         /* number of channels */
 214         *pos++ = (prev->chan - start->chan) / chan_spacing + 1;
 215         /* maximum transmit power level */
 216         *pos++ = start->max_tx_power;
 217
 218         return pos;
 219 }
 220
 221
 222 static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
 223                                 int max_len)
 224 {
 225         u8 *pos = eid;
 226         u8 *end = eid + max_len;
 227         int i;
 228         struct hostapd_hw_modes *mode;
 229         struct hostapd_channel_data *start, *prev;
 230         int chan_spacing = 1;
 231
 232         if (!hapd->iconf->ieee80211d || max_len < 6 ||
 233             hapd->iface->current_mode == NULL)
 234                 return eid;
 235
 236         *pos++ = WLAN_EID_COUNTRY;
 237         pos++; /* length will be set later */
 238         os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
 239         pos += 3;
 240
 241         mode = hapd->iface->current_mode;
 242         if (mode->mode == HOSTAPD_MODE_IEEE80211A)
 243                 chan_spacing = 4;
 244
 245         start = prev = NULL;
 246         for (i = 0; i < mode->num_channels; i++) {
 247                 struct hostapd_channel_data *chan = &mode->channels[i];
 248                 if (chan->flag & HOSTAPD_CHAN_DISABLED)
 249                         continue;
 250                 if (start && prev &&
 251                     prev->chan + chan_spacing == chan->chan &&
 252                     start->max_tx_power == chan->max_tx_power) {
 253                         prev = chan;
 254                         continue; /* can use same entry */
 255                 }
 256
 257                 if (start && prev) {
 258                         pos = hostapd_eid_country_add(pos, end, chan_spacing,
 259                                                       start, prev);
 260                         start = NULL;
 261                 }
 262
 263                 /* Start new group */
 264                 start = prev = chan;
 265         }
 266
 267         if (start) {
 268                 pos = hostapd_eid_country_add(pos, end, chan_spacing,
 269                                               start, prev);
 270         }
 271
 272         if ((pos - eid) & 1) {
 273                 if (end - pos < 1)
 274                         return eid;
 275                 *pos++ = 0; /* pad for 16-bit alignment */
 276         }
 277
 278         eid[1] = (pos - eid) - 2;
 279
 280         return pos;
 281 }
 282
 283
 284 static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len)
 285 {
 286         const u8 *ie;
 287         size_t ielen;
 288
 289         ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
 290         if (ie == NULL || ielen > len)
 291                 return eid;
 292
 293         os_memcpy(eid, ie, ielen);
 294         return eid + ielen;
 295 }
 296
 297
 298 static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid)
 299 {
 300         u8 chan;
 301
 302         if (!hapd->cs_freq_params.freq)
 303                 return eid;
 304
 305         if (ieee80211_freq_to_chan(hapd->cs_freq_params.freq, &chan) ==
 306             NUM_HOSTAPD_MODES)
 307                 return eid;
 308
 309         *eid++ = WLAN_EID_CHANNEL_SWITCH;
 310         *eid++ = 3;
 311         *eid++ = hapd->cs_block_tx;
 312         *eid++ = chan;
 313         *eid++ = hapd->cs_count;
 314
 315         return eid;
 316 }
 317
 318
 319 static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid)
 320 {
 321         u8 sec_ch;
 322
 323         if (!hapd->cs_freq_params.sec_channel_offset)
 324                 return eid;
 325
 326         if (hapd->cs_freq_params.sec_channel_offset == -1)
 327                 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW;
 328         else if (hapd->cs_freq_params.sec_channel_offset == 1)
 329                 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE;
 330         else
 331                 return eid;
 332
 333         *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
 334         *eid++ = 1;
 335         *eid++ = sec_ch;
 336
 337         return eid;
 338 }
 339
 340
 341 static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos,
 342                                   u8 *start, unsigned int *csa_counter_off)
 343 {
 344         u8 *old_pos = pos;
 345
 346         if (!csa_counter_off)
 347                 return pos;
 348
 349         *csa_counter_off = 0;
 350         pos = hostapd_eid_csa(hapd, pos);
 351
 352         if (pos != old_pos) {
 353                 /* save an offset to the counter - should be last byte */
 354                 *csa_counter_off = pos - start - 1;
 355                 pos = hostapd_eid_secondary_channel(hapd, pos);
 356         }
 357
 358         return pos;
 359 }
 360
 361
 362 static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 363                                    struct sta_info *sta,
 364                                    const struct ieee80211_mgmt *req,
 365                                    int is_p2p, size_t *resp_len)
 366 {
 367         struct ieee80211_mgmt *resp;
 368         u8 *pos, *epos;
 369         size_t buflen;
 370
 371 #define MAX_PROBERESP_LEN 768
 372         buflen = MAX_PROBERESP_LEN;
 373 #ifdef CONFIG_WPS
 374         if (hapd->wps_probe_resp_ie)
 375                 buflen += wpabuf_len(hapd->wps_probe_resp_ie);
 376 #endif /* CONFIG_WPS */
 377 #ifdef CONFIG_P2P
 378         if (hapd->p2p_probe_resp_ie)
 379                 buflen += wpabuf_len(hapd->p2p_probe_resp_ie);
 380 #endif /* CONFIG_P2P */
 381         if (hapd->conf->vendor_elements)
 382                 buflen += wpabuf_len(hapd->conf->vendor_elements);
 383         if (hapd->conf->vendor_vht) {
 384                 buflen += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) +
 385                         2 + sizeof(struct ieee80211_vht_operation);
 386         }
 387         resp = os_zalloc(buflen);
 388         if (resp == NULL)
 389                 return NULL;
 390
 391         epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
 392
 393         resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 394                                            WLAN_FC_STYPE_PROBE_RESP);
 395         if (req)
 396                 os_memcpy(resp->da, req->sa, ETH_ALEN);
 397         os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
 398
 399         os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
 400         resp->u.probe_resp.beacon_int =
 401                 host_to_le16(hapd->iconf->beacon_int);
 402
 403         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 404         resp->u.probe_resp.capab_info =
 405                 host_to_le16(hostapd_own_capab_info(hapd, sta, 1));
 406
 407         pos = resp->u.probe_resp.variable;
 408         *pos++ = WLAN_EID_SSID;
 409         *pos++ = hapd->conf->ssid.ssid_len;
 410         os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len);
 411         pos += hapd->conf->ssid.ssid_len;
 412
 413         /* Supported rates */
 414         pos = hostapd_eid_supp_rates(hapd, pos);
 415
 416         /* DS Params */
 417         pos = hostapd_eid_ds_params(hapd, pos);
 418
 419         pos = hostapd_eid_country(hapd, pos, epos - pos);
 420
 421         /* Power Constraint element */
 422         pos = hostapd_eid_pwr_constraint(hapd, pos);
 423
 424         /* ERP Information element */
 425         pos = hostapd_eid_erp_info(hapd, pos);
 426
 427         /* Extended supported rates */
 428         pos = hostapd_eid_ext_supp_rates(hapd, pos);
 429
 430         /* RSN, MDIE, WPA */
 431         pos = hostapd_eid_wpa(hapd, pos, epos - pos);
 432
 433         pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
 434
 435         pos = hostapd_eid_rm_enabled_capab(hapd, pos, epos - pos);
 436
 437 #ifdef CONFIG_IEEE80211N
 438         pos = hostapd_eid_ht_capabilities(hapd, pos);
 439         pos = hostapd_eid_ht_operation(hapd, pos);
 440 #endif /* CONFIG_IEEE80211N */
 441
 442         pos = hostapd_eid_ext_capab(hapd, pos);
 443
 444         pos = hostapd_eid_time_adv(hapd, pos);
 445         pos = hostapd_eid_time_zone(hapd, pos);
 446
 447         pos = hostapd_eid_interworking(hapd, pos);
 448         pos = hostapd_eid_adv_proto(hapd, pos);
 449         pos = hostapd_eid_roaming_consortium(hapd, pos);
 450
 451         pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp,
 452                                     &hapd->cs_c_off_proberesp);
 453 #ifdef CONFIG_IEEE80211AC
 454         if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) {
 455                 pos = hostapd_eid_vht_capabilities(hapd, pos);
 456                 pos = hostapd_eid_vht_operation(hapd, pos);
 457         }
 458         if (hapd->conf->vendor_vht)
 459                 pos = hostapd_eid_vendor_vht(hapd, pos);
 460 #endif /* CONFIG_IEEE80211AC */
 461
 462         /* Wi-Fi Alliance WMM */
 463         pos = hostapd_eid_wmm(hapd, pos);
 464
 465 #ifdef CONFIG_WPS
 466         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
 467                 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
 468                           wpabuf_len(hapd->wps_probe_resp_ie));
 469                 pos += wpabuf_len(hapd->wps_probe_resp_ie);
 470         }
 471 #endif /* CONFIG_WPS */
 472
 473 #ifdef CONFIG_P2P
 474         if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
 475             hapd->p2p_probe_resp_ie) {
 476                 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
 477                           wpabuf_len(hapd->p2p_probe_resp_ie));
 478                 pos += wpabuf_len(hapd->p2p_probe_resp_ie);
 479         }
 480 #endif /* CONFIG_P2P */
 481 #ifdef CONFIG_P2P_MANAGER
 482         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 483             P2P_MANAGE)
 484                 pos = hostapd_eid_p2p_manage(hapd, pos);
 485 #endif /* CONFIG_P2P_MANAGER */
 486
 487 #ifdef CONFIG_HS20
 488         pos = hostapd_eid_hs20_indication(hapd, pos);
 489         pos = hostapd_eid_osen(hapd, pos);
 490 #endif /* CONFIG_HS20 */
 491
 492         if (hapd->conf->vendor_elements) {
 493                 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
 494                           wpabuf_len(hapd->conf->vendor_elements));
 495                 pos += wpabuf_len(hapd->conf->vendor_elements);
 496         }
 497
 498         *resp_len = pos - (u8 *) resp;
 499         return (u8 *) resp;
 500 }
 501
 502
 503 enum ssid_match_result {
 504         NO_SSID_MATCH,
 505         EXACT_SSID_MATCH,
 506         WILDCARD_SSID_MATCH
 507 };
 508
 509 static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
 510                                          const u8 *ssid, size_t ssid_len,
 511                                          const u8 *ssid_list,
 512                                          size_t ssid_list_len)
 513 {
 514         const u8 *pos, *end;
 515         int wildcard = 0;
 516
 517         if (ssid_len == 0)
 518                 wildcard = 1;
 519         if (ssid_len == hapd->conf->ssid.ssid_len &&
 520             os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
 521                 return EXACT_SSID_MATCH;
 522
 523         if (ssid_list == NULL)
 524                 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 525
 526         pos = ssid_list;
 527         end = ssid_list + ssid_list_len;
 528         while (pos + 1 <= end) {
 529                 if (pos + 2 + pos[1] > end)
 530                         break;
 531                 if (pos[1] == 0)
 532                         wildcard = 1;
 533                 if (pos[1] == hapd->conf->ssid.ssid_len &&
 534                     os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
 535                         return EXACT_SSID_MATCH;
 536                 pos += 2 + pos[1];
 537         }
 538
 539         return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 540 }
 541
 542
 543 void handle_probe_req(struct hostapd_data *hapd,
 544                       const struct ieee80211_mgmt *mgmt, size_t len,
 545                       int ssi_signal)
 546 {
 547         u8 *resp;
 548         struct ieee802_11_elems elems;
 549         const u8 *ie;
 550         size_t ie_len;
 551         struct sta_info *sta = NULL;
 552         size_t i, resp_len;
 553         int noack;
 554         enum ssid_match_result res;
 555
 556         ie = mgmt->u.probe_req.variable;
 557         if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
 558                 return;
 559         ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
 560
 561         for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
 562                 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
 563                                             mgmt->sa, mgmt->da, mgmt->bssid,
 564                                             ie, ie_len, ssi_signal) > 0)
 565                         return;
 566
 567         if (!hapd->iconf->send_probe_response)
 568                 return;
 569
 570         if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
 571                 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
 572                            MAC2STR(mgmt->sa));
 573                 return;
 574         }
 575
 576         if ((!elems.ssid || !elems.supp_rates)) {
 577                 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
 578                            "without SSID or supported rates element",
 579                            MAC2STR(mgmt->sa));
 580                 return;
 581         }
 582
 583         /*
 584          * No need to reply if the Probe Request frame was sent on an adjacent
 585          * channel. IEEE Std 802.11-2012 describes this as a requirement for an
 586          * AP with dot11RadioMeasurementActivated set to true, but strictly
 587          * speaking does not allow such ignoring of Probe Request frames if
 588          * dot11RadioMeasurementActivated is false. Anyway, this can help reduce
 589          * number of unnecessary Probe Response frames for cases where the STA
 590          * is less likely to see them (Probe Request frame sent on a
 591          * neighboring, but partially overlapping, channel).
 592          */
 593         if (elems.ds_params && elems.ds_params_len == 1 &&
 594             hapd->iface->current_mode &&
 595             (hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G ||
 596              hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211B) &&
 597             hapd->iconf->channel != elems.ds_params[0]) {
 598                 wpa_printf(MSG_DEBUG,
 599                            "Ignore Probe Request due to DS Params mismatch: chan=%u != ds.chan=%u",
 600                            hapd->iconf->channel, elems.ds_params[0]);
 601                 return;
 602         }
 603
 604 #ifdef CONFIG_P2P
 605         if (hapd->p2p && elems.wps_ie) {
 606                 struct wpabuf *wps;
 607                 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
 608                 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
 609                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 610                                    "due to mismatch with Requested Device "
 611                                    "Type");
 612                         wpabuf_free(wps);
 613                         return;
 614                 }
 615                 wpabuf_free(wps);
 616         }
 617
 618         if (hapd->p2p && elems.p2p) {
 619                 struct wpabuf *p2p;
 620                 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
 621                 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
 622                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 623                                    "due to mismatch with Device ID");
 624                         wpabuf_free(p2p);
 625                         return;
 626                 }
 627                 wpabuf_free(p2p);
 628         }
 629 #endif /* CONFIG_P2P */
 630
 631         if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
 632             elems.ssid_list_len == 0) {
 633                 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
 634                            "broadcast SSID ignored", MAC2STR(mgmt->sa));
 635                 return;
 636         }
 637
 638         sta = ap_get_sta(hapd, mgmt->sa);
 639
 640 #ifdef CONFIG_P2P
 641         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 642             elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
 643             os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
 644                       P2P_WILDCARD_SSID_LEN) == 0) {
 645                 /* Process P2P Wildcard SSID like Wildcard SSID */
 646                 elems.ssid_len = 0;
 647         }
 648 #endif /* CONFIG_P2P */
 649
 650         res = ssid_match(hapd, elems.ssid, elems.ssid_len,
 651                          elems.ssid_list, elems.ssid_list_len);
 652         if (res != NO_SSID_MATCH) {
 653                 if (sta)
 654                         sta->ssid_probe = &hapd->conf->ssid;
 655         } else {
 656                 if (!(mgmt->da[0] & 0x01)) {
 657                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 658                                    " for foreign SSID '%s' (DA " MACSTR ")%s",
 659                                    MAC2STR(mgmt->sa),
 660                                    wpa_ssid_txt(elems.ssid, elems.ssid_len),
 661                                    MAC2STR(mgmt->da),
 662                                    elems.ssid_list ? " (SSID list)" : "");
 663                 }
 664                 return;
 665         }
 666
 667 #ifdef CONFIG_INTERWORKING
 668         if (hapd->conf->interworking &&
 669             elems.interworking && elems.interworking_len >= 1) {
 670                 u8 ant = elems.interworking[0] & 0x0f;
 671                 if (ant != INTERWORKING_ANT_WILDCARD &&
 672                     ant != hapd->conf->access_network_type) {
 673                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 674                                    " for mismatching ANT %u ignored",
 675                                    MAC2STR(mgmt->sa), ant);
 676                         return;
 677                 }
 678         }
 679
 680         if (hapd->conf->interworking && elems.interworking &&
 681             (elems.interworking_len == 7 || elems.interworking_len == 9)) {
 682                 const u8 *hessid;
 683                 if (elems.interworking_len == 7)
 684                         hessid = elems.interworking + 1;
 685                 else
 686                         hessid = elems.interworking + 1 + 2;
 687                 if (!is_broadcast_ether_addr(hessid) &&
 688                     os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
 689                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 690                                    " for mismatching HESSID " MACSTR
 691                                    " ignored",
 692                                    MAC2STR(mgmt->sa), MAC2STR(hessid));
 693                         return;
 694                 }
 695         }
 696 #endif /* CONFIG_INTERWORKING */
 697
 698 #ifdef CONFIG_P2P
 699         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 700             supp_rates_11b_only(&elems)) {
 701                 /* Indicates support for 11b rates only */
 702                 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
 703                            MACSTR " with only 802.11b rates",
 704                            MAC2STR(mgmt->sa));
 705                 return;
 706         }
 707 #endif /* CONFIG_P2P */
 708
 709         /* TODO: verify that supp_rates contains at least one matching rate
 710          * with AP configuration */
 711
 712 #ifdef CONFIG_TESTING_OPTIONS
 713         if (hapd->iconf->ignore_probe_probability > 0.0 &&
 714             drand48() < hapd->iconf->ignore_probe_probability) {
 715                 wpa_printf(MSG_INFO,
 716                            "TESTING: ignoring probe request from " MACSTR,
 717                            MAC2STR(mgmt->sa));
 718                 return;
 719         }
 720 #endif /* CONFIG_TESTING_OPTIONS */
 721
 722         resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL,
 723                                       &resp_len);
 724         if (resp == NULL)
 725                 return;
 726
 727         /*
 728          * If this is a broadcast probe request, apply no ack policy to avoid
 729          * excessive retries.
 730          */
 731         noack = !!(res == WILDCARD_SSID_MATCH &&
 732                    is_broadcast_ether_addr(mgmt->da));
 733
 734         if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
 735                 wpa_printf(MSG_INFO, "handle_probe_req: send failed");
 736
 737         os_free(resp);
 738
 739         wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
 740                    "SSID", MAC2STR(mgmt->sa),
 741                    elems.ssid_len == 0 ? "broadcast" : "our");
 742 }
 743
 744
 745 static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
 746                                         size_t *resp_len)
 747 {
 748         /* check probe response offloading caps and print warnings */
 749         if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
 750                 return NULL;
 751
 752 #ifdef CONFIG_WPS
 753         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
 754             (!(hapd->iface->probe_resp_offloads &
 755                (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
 756                 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
 757                 wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
 758                            "Probe Response while not supporting this");
 759 #endif /* CONFIG_WPS */
 760
 761 #ifdef CONFIG_P2P
 762         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
 763             !(hapd->iface->probe_resp_offloads &
 764               WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
 765                 wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
 766                            "Probe Response while not supporting this");
 767 #endif  /* CONFIG_P2P */
 768
 769         if (hapd->conf->interworking &&
 770             !(hapd->iface->probe_resp_offloads &
 771               WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
 772                 wpa_printf(MSG_WARNING, "Device is trying to offload "
 773                            "Interworking Probe Response while not supporting "
 774                            "this");
 775
 776         /* Generate a Probe Response template for the non-P2P case */
 777         return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len);
 778 }
 779
 780 #endif /* NEED_AP_MLME */
 781
 782
 783 int ieee802_11_build_ap_params(struct hostapd_data *hapd,
 784                                struct wpa_driver_ap_params *params)
 785 {
 786         struct ieee80211_mgmt *head = NULL;
 787         u8 *tail = NULL;
 788         size_t head_len = 0, tail_len = 0;
 789         u8 *resp = NULL;
 790         size_t resp_len = 0;
 791 #ifdef NEED_AP_MLME
 792         u16 capab_info;
 793         u8 *pos, *tailpos;
 794
 795 #define BEACON_HEAD_BUF_SIZE 256
 796 #define BEACON_TAIL_BUF_SIZE 512
 797         head = os_zalloc(BEACON_HEAD_BUF_SIZE);
 798         tail_len = BEACON_TAIL_BUF_SIZE;
 799 #ifdef CONFIG_WPS
 800         if (hapd->conf->wps_state && hapd->wps_beacon_ie)
 801                 tail_len += wpabuf_len(hapd->wps_beacon_ie);
 802 #endif /* CONFIG_WPS */
 803 #ifdef CONFIG_P2P
 804         if (hapd->p2p_beacon_ie)
 805                 tail_len += wpabuf_len(hapd->p2p_beacon_ie);
 806 #endif /* CONFIG_P2P */
 807         if (hapd->conf->vendor_elements)
 808                 tail_len += wpabuf_len(hapd->conf->vendor_elements);
 809
 810 #ifdef CONFIG_IEEE80211AC
 811         if (hapd->conf->vendor_vht) {
 812                 tail_len += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) +
 813                         2 + sizeof(struct ieee80211_vht_operation);
 814         }
 815 #endif /* CONFIG_IEEE80211AC */
 816
 817         tailpos = tail = os_malloc(tail_len);
 818         if (head == NULL || tail == NULL) {
 819                 wpa_printf(MSG_ERROR, "Failed to set beacon data");
 820                 os_free(head);
 821                 os_free(tail);
 822                 return -1;
 823         }
 824
 825         head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 826                                            WLAN_FC_STYPE_BEACON);
 827         head->duration = host_to_le16(0);
 828         os_memset(head->da, 0xff, ETH_ALEN);
 829
 830         os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
 831         os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
 832         head->u.beacon.beacon_int =
 833                 host_to_le16(hapd->iconf->beacon_int);
 834
 835         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 836         capab_info = hostapd_own_capab_info(hapd, NULL, 0);
 837         head->u.beacon.capab_info = host_to_le16(capab_info);
 838         pos = &head->u.beacon.variable[0];
 839
 840         /* SSID */
 841         *pos++ = WLAN_EID_SSID;
 842         if (hapd->conf->ignore_broadcast_ssid == 2) {
 843                 /* clear the data, but keep the correct length of the SSID */
 844                 *pos++ = hapd->conf->ssid.ssid_len;
 845                 os_memset(pos, 0, hapd->conf->ssid.ssid_len);
 846                 pos += hapd->conf->ssid.ssid_len;
 847         } else if (hapd->conf->ignore_broadcast_ssid) {
 848                 *pos++ = 0; /* empty SSID */
 849         } else {
 850                 *pos++ = hapd->conf->ssid.ssid_len;
 851                 os_memcpy(pos, hapd->conf->ssid.ssid,
 852                           hapd->conf->ssid.ssid_len);
 853                 pos += hapd->conf->ssid.ssid_len;
 854         }
 855
 856         /* Supported rates */
 857         pos = hostapd_eid_supp_rates(hapd, pos);
 858
 859         /* DS Params */
 860         pos = hostapd_eid_ds_params(hapd, pos);
 861
 862         head_len = pos - (u8 *) head;
 863
 864         tailpos = hostapd_eid_country(hapd, tailpos,
 865                                       tail + BEACON_TAIL_BUF_SIZE - tailpos);
 866
 867         /* Power Constraint element */
 868         tailpos = hostapd_eid_pwr_constraint(hapd, tailpos);
 869
 870         /* ERP Information element */
 871         tailpos = hostapd_eid_erp_info(hapd, tailpos);
 872
 873         /* Extended supported rates */
 874         tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
 875
 876         /* RSN, MDIE, WPA */
 877         tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
 878                                   tailpos);
 879
 880         tailpos = hostapd_eid_rm_enabled_capab(hapd, tailpos,
 881                                                tail + BEACON_TAIL_BUF_SIZE -
 882                                                tailpos);
 883
 884         tailpos = hostapd_eid_bss_load(hapd, tailpos,
 885                                        tail + BEACON_TAIL_BUF_SIZE - tailpos);
 886
 887 #ifdef CONFIG_IEEE80211N
 888         tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
 889         tailpos = hostapd_eid_ht_operation(hapd, tailpos);
 890 #endif /* CONFIG_IEEE80211N */
 891
 892         tailpos = hostapd_eid_ext_capab(hapd, tailpos);
 893
 894         /*
 895          * TODO: Time Advertisement element should only be included in some
 896          * DTIM Beacon frames.
 897          */
 898         tailpos = hostapd_eid_time_adv(hapd, tailpos);
 899
 900         tailpos = hostapd_eid_interworking(hapd, tailpos);
 901         tailpos = hostapd_eid_adv_proto(hapd, tailpos);
 902         tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
 903         tailpos = hostapd_add_csa_elems(hapd, tailpos, tail,
 904                                         &hapd->cs_c_off_beacon);
 905 #ifdef CONFIG_IEEE80211AC
 906         if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) {
 907                 tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
 908                 tailpos = hostapd_eid_vht_operation(hapd, tailpos);
 909         }
 910         if (hapd->conf->vendor_vht)
 911                 tailpos = hostapd_eid_vendor_vht(hapd, tailpos);
 912 #endif /* CONFIG_IEEE80211AC */
 913
 914         /* Wi-Fi Alliance WMM */
 915         tailpos = hostapd_eid_wmm(hapd, tailpos);
 916
 917 #ifdef CONFIG_WPS
 918         if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
 919                 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
 920                           wpabuf_len(hapd->wps_beacon_ie));
 921                 tailpos += wpabuf_len(hapd->wps_beacon_ie);
 922         }
 923 #endif /* CONFIG_WPS */
 924
 925 #ifdef CONFIG_P2P
 926         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
 927                 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
 928                           wpabuf_len(hapd->p2p_beacon_ie));
 929                 tailpos += wpabuf_len(hapd->p2p_beacon_ie);
 930         }
 931 #endif /* CONFIG_P2P */
 932 #ifdef CONFIG_P2P_MANAGER
 933         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 934             P2P_MANAGE)
 935                 tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
 936 #endif /* CONFIG_P2P_MANAGER */
 937
 938 #ifdef CONFIG_HS20
 939         tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
 940         tailpos = hostapd_eid_osen(hapd, tailpos);
 941 #endif /* CONFIG_HS20 */
 942
 943         if (hapd->conf->vendor_elements) {
 944                 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
 945                           wpabuf_len(hapd->conf->vendor_elements));
 946                 tailpos += wpabuf_len(hapd->conf->vendor_elements);
 947         }
 948
 949         tail_len = tailpos > tail ? tailpos - tail : 0;
 950
 951         resp = hostapd_probe_resp_offloads(hapd, &resp_len);
 952 #endif /* NEED_AP_MLME */
 953
 954         os_memset(params, 0, sizeof(*params));
 955         params->head = (u8 *) head;
 956         params->head_len = head_len;
 957         params->tail = tail;
 958         params->tail_len = tail_len;
 959         params->proberesp = resp;
 960         params->proberesp_len = resp_len;
 961         params->dtim_period = hapd->conf->dtim_period;
 962         params->beacon_int = hapd->iconf->beacon_int;
 963         params->basic_rates = hapd->iface->basic_rates;
 964         params->ssid = hapd->conf->ssid.ssid;
 965         params->ssid_len = hapd->conf->ssid.ssid_len;
 966         params->pairwise_ciphers = hapd->conf->wpa_pairwise |
 967                 hapd->conf->rsn_pairwise;
 968         params->group_cipher = hapd->conf->wpa_group;
 969         params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
 970         params->auth_algs = hapd->conf->auth_algs;
 971         params->wpa_version = hapd->conf->wpa;
 972         params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
 973                 (hapd->conf->ieee802_1x &&
 974                  (hapd->conf->default_wep_key_len ||
 975                   hapd->conf->individual_wep_key_len));
 976         switch (hapd->conf->ignore_broadcast_ssid) {
 977         case 0:
 978                 params->hide_ssid = NO_SSID_HIDING;
 979                 break;
 980         case 1:
 981                 params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
 982                 break;
 983         case 2:
 984                 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
 985                 break;
 986         }
 987         params->isolate = hapd->conf->isolate;
 988         params->smps_mode = hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_MASK;
 989 #ifdef NEED_AP_MLME
 990         params->cts_protect = !!(ieee802_11_erp_info(hapd) &
 991                                 ERP_INFO_USE_PROTECTION);
 992         params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
 993                 hapd->iconf->preamble == SHORT_PREAMBLE;
 994         if (hapd->iface->current_mode &&
 995             hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
 996                 params->short_slot_time =
 997                         hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
 998         else
 999                 params->short_slot_time = -1;
1000         if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
1001                 params->ht_opmode = -1;
1002         else
1003                 params->ht_opmode = hapd->iface->ht_op_mode;
1004 #endif /* NEED_AP_MLME */
1005         params->interworking = hapd->conf->interworking;
1006         if (hapd->conf->interworking &&
1007             !is_zero_ether_addr(hapd->conf->hessid))
1008                 params->hessid = hapd->conf->hessid;
1009         params->access_network_type = hapd->conf->access_network_type;
1010         params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
1011 #ifdef CONFIG_P2P
1012         params->p2p_go_ctwindow = hapd->iconf->p2p_go_ctwindow;
1013 #endif /* CONFIG_P2P */
1014 #ifdef CONFIG_HS20
1015         params->disable_dgaf = hapd->conf->disable_dgaf;
1016         if (hapd->conf->osen) {
1017                 params->privacy = 1;
1018                 params->osen = 1;
1019         }
1020 #endif /* CONFIG_HS20 */
1021         return 0;
1022 }
1023
1024
1025 void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
1026 {
1027         os_free(params->tail);
1028         params->tail = NULL;
1029         os_free(params->head);
1030         params->head = NULL;
1031         os_free(params->proberesp);
1032         params->proberesp = NULL;
1033 }
1034
1035
1036 int ieee802_11_set_beacon(struct hostapd_data *hapd)
1037 {
1038         struct wpa_driver_ap_params params;
1039         struct hostapd_freq_params freq;
1040         struct hostapd_iface *iface = hapd->iface;
1041         struct hostapd_config *iconf = iface->conf;
1042         struct wpabuf *beacon, *proberesp, *assocresp;
1043         int res, ret = -1;
1044
1045         if (hapd->csa_in_progress) {
1046                 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
1047                 return -1;
1048         }
1049
1050         hapd->beacon_set_done = 1;
1051
1052         if (ieee802_11_build_ap_params(hapd, &params) < 0)
1053                 return -1;
1054
1055         if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
1056             0)
1057                 goto fail;
1058
1059         params.beacon_ies = beacon;
1060         params.proberesp_ies = proberesp;
1061         params.assocresp_ies = assocresp;
1062         params.reenable = hapd->reenable_beacon;
1063         hapd->reenable_beacon = 0;
1064
1065         if (iface->current_mode &&
1066             hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq,
1067                                     iconf->channel, iconf->ieee80211n,
1068                                     iconf->ieee80211ac,
1069                                     iconf->secondary_channel,
1070                                     iconf->vht_oper_chwidth,
1071                                     iconf->vht_oper_centr_freq_seg0_idx,
1072                                     iconf->vht_oper_centr_freq_seg1_idx,
1073                                     iface->current_mode->vht_capab) == 0)
1074                 params.freq = &freq;
1075
1076         res = hostapd_drv_set_ap(hapd, &params);
1077         hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
1078         if (res)
1079                 wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
1080         else
1081                 ret = 0;
1082 fail:
1083         ieee802_11_free_ap_params(&params);
1084         return ret;
1085 }
1086
1087
1088 int ieee802_11_set_beacons(struct hostapd_iface *iface)
1089 {
1090         size_t i;
1091         int ret = 0;
1092
1093         for (i = 0; i < iface->num_bss; i++) {
1094                 if (iface->bss[i]->started &&
1095                     ieee802_11_set_beacon(iface->bss[i]) < 0)
1096                         ret = -1;
1097         }
1098
1099         return ret;
1100 }
1101
1102
1103 /* only update beacons if started */
1104 int ieee802_11_update_beacons(struct hostapd_iface *iface)
1105 {
1106         size_t i;
1107         int ret = 0;
1108
1109         for (i = 0; i < iface->num_bss; i++) {
1110                 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started &&
1111                     ieee802_11_set_beacon(iface->bss[i]) < 0)
1112                         ret = -1;
1113         }
1114
1115         return ret;
1116 }
1117
1118 #endif /* CONFIG_NATIVE_WINDOWS */