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                                    const struct ieee80211_mgmt *req,
 364                                    int is_p2p, size_t *resp_len)
 365 {
 366         struct ieee80211_mgmt *resp;
 367         u8 *pos, *epos;
 368         size_t buflen;
 369
 370 #define MAX_PROBERESP_LEN 768
 371         buflen = MAX_PROBERESP_LEN;
 372 #ifdef CONFIG_WPS
 373         if (hapd->wps_probe_resp_ie)
 374                 buflen += wpabuf_len(hapd->wps_probe_resp_ie);
 375 #endif /* CONFIG_WPS */
 376 #ifdef CONFIG_P2P
 377         if (hapd->p2p_probe_resp_ie)
 378                 buflen += wpabuf_len(hapd->p2p_probe_resp_ie);
 379 #endif /* CONFIG_P2P */
 380         if (hapd->conf->vendor_elements)
 381                 buflen += wpabuf_len(hapd->conf->vendor_elements);
 382         if (hapd->conf->vendor_vht) {
 383                 buflen += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) +
 384                         2 + sizeof(struct ieee80211_vht_operation);
 385         }
 386         resp = os_zalloc(buflen);
 387         if (resp == NULL)
 388                 return NULL;
 389
 390         epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
 391
 392         resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 393                                            WLAN_FC_STYPE_PROBE_RESP);
 394         if (req)
 395                 os_memcpy(resp->da, req->sa, ETH_ALEN);
 396         os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
 397
 398         os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
 399         resp->u.probe_resp.beacon_int =
 400                 host_to_le16(hapd->iconf->beacon_int);
 401
 402         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 403         resp->u.probe_resp.capab_info =
 404                 host_to_le16(hostapd_own_capab_info(hapd));
 405
 406         pos = resp->u.probe_resp.variable;
 407         *pos++ = WLAN_EID_SSID;
 408         *pos++ = hapd->conf->ssid.ssid_len;
 409         os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len);
 410         pos += hapd->conf->ssid.ssid_len;
 411
 412         /* Supported rates */
 413         pos = hostapd_eid_supp_rates(hapd, pos);
 414
 415         /* DS Params */
 416         pos = hostapd_eid_ds_params(hapd, pos);
 417
 418         pos = hostapd_eid_country(hapd, pos, epos - pos);
 419
 420         /* Power Constraint element */
 421         pos = hostapd_eid_pwr_constraint(hapd, pos);
 422
 423         /* ERP Information element */
 424         pos = hostapd_eid_erp_info(hapd, pos);
 425
 426         /* Extended supported rates */
 427         pos = hostapd_eid_ext_supp_rates(hapd, pos);
 428
 429         /* RSN, MDIE, WPA */
 430         pos = hostapd_eid_wpa(hapd, pos, epos - pos);
 431
 432         pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
 433
 434         pos = hostapd_eid_rm_enabled_capab(hapd, pos, epos - pos);
 435
 436 #ifdef CONFIG_IEEE80211N
 437         pos = hostapd_eid_ht_capabilities(hapd, pos);
 438         pos = hostapd_eid_ht_operation(hapd, pos);
 439 #endif /* CONFIG_IEEE80211N */
 440
 441         pos = hostapd_eid_ext_capab(hapd, pos);
 442
 443         pos = hostapd_eid_time_adv(hapd, pos);
 444         pos = hostapd_eid_time_zone(hapd, pos);
 445
 446         pos = hostapd_eid_interworking(hapd, pos);
 447         pos = hostapd_eid_adv_proto(hapd, pos);
 448         pos = hostapd_eid_roaming_consortium(hapd, pos);
 449
 450         pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp,
 451                                     &hapd->cs_c_off_proberesp);
 452 #ifdef CONFIG_IEEE80211AC
 453         if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) {
 454                 pos = hostapd_eid_vht_capabilities(hapd, pos);
 455                 pos = hostapd_eid_vht_operation(hapd, pos);
 456         }
 457         if (hapd->conf->vendor_vht)
 458                 pos = hostapd_eid_vendor_vht(hapd, pos);
 459 #endif /* CONFIG_IEEE80211AC */
 460
 461         /* Wi-Fi Alliance WMM */
 462         pos = hostapd_eid_wmm(hapd, pos);
 463
 464 #ifdef CONFIG_WPS
 465         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
 466                 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
 467                           wpabuf_len(hapd->wps_probe_resp_ie));
 468                 pos += wpabuf_len(hapd->wps_probe_resp_ie);
 469         }
 470 #endif /* CONFIG_WPS */
 471
 472 #ifdef CONFIG_P2P
 473         if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
 474             hapd->p2p_probe_resp_ie) {
 475                 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
 476                           wpabuf_len(hapd->p2p_probe_resp_ie));
 477                 pos += wpabuf_len(hapd->p2p_probe_resp_ie);
 478         }
 479 #endif /* CONFIG_P2P */
 480 #ifdef CONFIG_P2P_MANAGER
 481         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 482             P2P_MANAGE)
 483                 pos = hostapd_eid_p2p_manage(hapd, pos);
 484 #endif /* CONFIG_P2P_MANAGER */
 485
 486 #ifdef CONFIG_HS20
 487         pos = hostapd_eid_hs20_indication(hapd, pos);
 488         pos = hostapd_eid_osen(hapd, pos);
 489 #endif /* CONFIG_HS20 */
 490
 491         if (hapd->conf->vendor_elements) {
 492                 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
 493                           wpabuf_len(hapd->conf->vendor_elements));
 494                 pos += wpabuf_len(hapd->conf->vendor_elements);
 495         }
 496
 497         *resp_len = pos - (u8 *) resp;
 498         return (u8 *) resp;
 499 }
 500
 501
 502 enum ssid_match_result {
 503         NO_SSID_MATCH,
 504         EXACT_SSID_MATCH,
 505         WILDCARD_SSID_MATCH
 506 };
 507
 508 static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
 509                                          const u8 *ssid, size_t ssid_len,
 510                                          const u8 *ssid_list,
 511                                          size_t ssid_list_len)
 512 {
 513         const u8 *pos, *end;
 514         int wildcard = 0;
 515
 516         if (ssid_len == 0)
 517                 wildcard = 1;
 518         if (ssid_len == hapd->conf->ssid.ssid_len &&
 519             os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
 520                 return EXACT_SSID_MATCH;
 521
 522         if (ssid_list == NULL)
 523                 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 524
 525         pos = ssid_list;
 526         end = ssid_list + ssid_list_len;
 527         while (pos + 1 <= end) {
 528                 if (pos + 2 + pos[1] > end)
 529                         break;
 530                 if (pos[1] == 0)
 531                         wildcard = 1;
 532                 if (pos[1] == hapd->conf->ssid.ssid_len &&
 533                     os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
 534                         return EXACT_SSID_MATCH;
 535                 pos += 2 + pos[1];
 536         }
 537
 538         return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 539 }
 540
 541
 542 void handle_probe_req(struct hostapd_data *hapd,
 543                       const struct ieee80211_mgmt *mgmt, size_t len,
 544                       int ssi_signal)
 545 {
 546         u8 *resp;
 547         struct ieee802_11_elems elems;
 548         const u8 *ie;
 549         size_t ie_len;
 550         size_t i, resp_len;
 551         int noack;
 552         enum ssid_match_result res;
 553
 554         ie = mgmt->u.probe_req.variable;
 555         if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
 556                 return;
 557         ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
 558
 559         for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
 560                 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
 561                                             mgmt->sa, mgmt->da, mgmt->bssid,
 562                                             ie, ie_len, ssi_signal) > 0)
 563                         return;
 564
 565         if (!hapd->iconf->send_probe_response)
 566                 return;
 567
 568         if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
 569                 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
 570                            MAC2STR(mgmt->sa));
 571                 return;
 572         }
 573
 574         if ((!elems.ssid || !elems.supp_rates)) {
 575                 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
 576                            "without SSID or supported rates element",
 577                            MAC2STR(mgmt->sa));
 578                 return;
 579         }
 580
 581         /*
 582          * No need to reply if the Probe Request frame was sent on an adjacent
 583          * channel. IEEE Std 802.11-2012 describes this as a requirement for an
 584          * AP with dot11RadioMeasurementActivated set to true, but strictly
 585          * speaking does not allow such ignoring of Probe Request frames if
 586          * dot11RadioMeasurementActivated is false. Anyway, this can help reduce
 587          * number of unnecessary Probe Response frames for cases where the STA
 588          * is less likely to see them (Probe Request frame sent on a
 589          * neighboring, but partially overlapping, channel).
 590          */
 591         if (elems.ds_params &&
 592             hapd->iface->current_mode &&
 593             (hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G ||
 594              hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211B) &&
 595             hapd->iconf->channel != elems.ds_params[0]) {
 596                 wpa_printf(MSG_DEBUG,
 597                            "Ignore Probe Request due to DS Params mismatch: chan=%u != ds.chan=%u",
 598                            hapd->iconf->channel, elems.ds_params[0]);
 599                 return;
 600         }
 601
 602 #ifdef CONFIG_P2P
 603         if (hapd->p2p && elems.wps_ie) {
 604                 struct wpabuf *wps;
 605                 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
 606                 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
 607                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 608                                    "due to mismatch with Requested Device "
 609                                    "Type");
 610                         wpabuf_free(wps);
 611                         return;
 612                 }
 613                 wpabuf_free(wps);
 614         }
 615
 616         if (hapd->p2p && elems.p2p) {
 617                 struct wpabuf *p2p;
 618                 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
 619                 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
 620                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 621                                    "due to mismatch with Device ID");
 622                         wpabuf_free(p2p);
 623                         return;
 624                 }
 625                 wpabuf_free(p2p);
 626         }
 627 #endif /* CONFIG_P2P */
 628
 629         if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
 630             elems.ssid_list_len == 0) {
 631                 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
 632                            "broadcast SSID ignored", MAC2STR(mgmt->sa));
 633                 return;
 634         }
 635
 636 #ifdef CONFIG_P2P
 637         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 638             elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
 639             os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
 640                       P2P_WILDCARD_SSID_LEN) == 0) {
 641                 /* Process P2P Wildcard SSID like Wildcard SSID */
 642                 elems.ssid_len = 0;
 643         }
 644 #endif /* CONFIG_P2P */
 645
 646         res = ssid_match(hapd, elems.ssid, elems.ssid_len,
 647                          elems.ssid_list, elems.ssid_list_len);
 648         if (res == NO_SSID_MATCH) {
 649                 if (!(mgmt->da[0] & 0x01)) {
 650                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 651                                    " for foreign SSID '%s' (DA " MACSTR ")%s",
 652                                    MAC2STR(mgmt->sa),
 653                                    wpa_ssid_txt(elems.ssid, elems.ssid_len),
 654                                    MAC2STR(mgmt->da),
 655                                    elems.ssid_list ? " (SSID list)" : "");
 656                 }
 657                 return;
 658         }
 659
 660 #ifdef CONFIG_INTERWORKING
 661         if (hapd->conf->interworking &&
 662             elems.interworking && elems.interworking_len >= 1) {
 663                 u8 ant = elems.interworking[0] & 0x0f;
 664                 if (ant != INTERWORKING_ANT_WILDCARD &&
 665                     ant != hapd->conf->access_network_type) {
 666                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 667                                    " for mismatching ANT %u ignored",
 668                                    MAC2STR(mgmt->sa), ant);
 669                         return;
 670                 }
 671         }
 672
 673         if (hapd->conf->interworking && elems.interworking &&
 674             (elems.interworking_len == 7 || elems.interworking_len == 9)) {
 675                 const u8 *hessid;
 676                 if (elems.interworking_len == 7)
 677                         hessid = elems.interworking + 1;
 678                 else
 679                         hessid = elems.interworking + 1 + 2;
 680                 if (!is_broadcast_ether_addr(hessid) &&
 681                     os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
 682                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 683                                    " for mismatching HESSID " MACSTR
 684                                    " ignored",
 685                                    MAC2STR(mgmt->sa), MAC2STR(hessid));
 686                         return;
 687                 }
 688         }
 689 #endif /* CONFIG_INTERWORKING */
 690
 691 #ifdef CONFIG_P2P
 692         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 693             supp_rates_11b_only(&elems)) {
 694                 /* Indicates support for 11b rates only */
 695                 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
 696                            MACSTR " with only 802.11b rates",
 697                            MAC2STR(mgmt->sa));
 698                 return;
 699         }
 700 #endif /* CONFIG_P2P */
 701
 702         /* TODO: verify that supp_rates contains at least one matching rate
 703          * with AP configuration */
 704
 705 #ifdef CONFIG_TESTING_OPTIONS
 706         if (hapd->iconf->ignore_probe_probability > 0.0 &&
 707             drand48() < hapd->iconf->ignore_probe_probability) {
 708                 wpa_printf(MSG_INFO,
 709                            "TESTING: ignoring probe request from " MACSTR,
 710                            MAC2STR(mgmt->sa));
 711                 return;
 712         }
 713 #endif /* CONFIG_TESTING_OPTIONS */
 714
 715         resp = hostapd_gen_probe_resp(hapd, mgmt, elems.p2p != NULL,
 716                                       &resp_len);
 717         if (resp == NULL)
 718                 return;
 719
 720         /*
 721          * If this is a broadcast probe request, apply no ack policy to avoid
 722          * excessive retries.
 723          */
 724         noack = !!(res == WILDCARD_SSID_MATCH &&
 725                    is_broadcast_ether_addr(mgmt->da));
 726
 727         if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
 728                 wpa_printf(MSG_INFO, "handle_probe_req: send failed");
 729
 730         os_free(resp);
 731
 732         wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
 733                    "SSID", MAC2STR(mgmt->sa),
 734                    elems.ssid_len == 0 ? "broadcast" : "our");
 735 }
 736
 737
 738 static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
 739                                         size_t *resp_len)
 740 {
 741         /* check probe response offloading caps and print warnings */
 742         if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
 743                 return NULL;
 744
 745 #ifdef CONFIG_WPS
 746         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
 747             (!(hapd->iface->probe_resp_offloads &
 748                (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
 749                 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
 750                 wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
 751                            "Probe Response while not supporting this");
 752 #endif /* CONFIG_WPS */
 753
 754 #ifdef CONFIG_P2P
 755         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
 756             !(hapd->iface->probe_resp_offloads &
 757               WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
 758                 wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
 759                            "Probe Response while not supporting this");
 760 #endif  /* CONFIG_P2P */
 761
 762         if (hapd->conf->interworking &&
 763             !(hapd->iface->probe_resp_offloads &
 764               WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
 765                 wpa_printf(MSG_WARNING, "Device is trying to offload "
 766                            "Interworking Probe Response while not supporting "
 767                            "this");
 768
 769         /* Generate a Probe Response template for the non-P2P case */
 770         return hostapd_gen_probe_resp(hapd, NULL, 0, resp_len);
 771 }
 772
 773 #endif /* NEED_AP_MLME */
 774
 775
 776 int ieee802_11_build_ap_params(struct hostapd_data *hapd,
 777                                struct wpa_driver_ap_params *params)
 778 {
 779         struct ieee80211_mgmt *head = NULL;
 780         u8 *tail = NULL;
 781         size_t head_len = 0, tail_len = 0;
 782         u8 *resp = NULL;
 783         size_t resp_len = 0;
 784 #ifdef NEED_AP_MLME
 785         u16 capab_info;
 786         u8 *pos, *tailpos;
 787
 788 #define BEACON_HEAD_BUF_SIZE 256
 789 #define BEACON_TAIL_BUF_SIZE 512
 790         head = os_zalloc(BEACON_HEAD_BUF_SIZE);
 791         tail_len = BEACON_TAIL_BUF_SIZE;
 792 #ifdef CONFIG_WPS
 793         if (hapd->conf->wps_state && hapd->wps_beacon_ie)
 794                 tail_len += wpabuf_len(hapd->wps_beacon_ie);
 795 #endif /* CONFIG_WPS */
 796 #ifdef CONFIG_P2P
 797         if (hapd->p2p_beacon_ie)
 798                 tail_len += wpabuf_len(hapd->p2p_beacon_ie);
 799 #endif /* CONFIG_P2P */
 800         if (hapd->conf->vendor_elements)
 801                 tail_len += wpabuf_len(hapd->conf->vendor_elements);
 802
 803 #ifdef CONFIG_IEEE80211AC
 804         if (hapd->conf->vendor_vht) {
 805                 tail_len += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) +
 806                         2 + sizeof(struct ieee80211_vht_operation);
 807         }
 808 #endif /* CONFIG_IEEE80211AC */
 809
 810         tailpos = tail = os_malloc(tail_len);
 811         if (head == NULL || tail == NULL) {
 812                 wpa_printf(MSG_ERROR, "Failed to set beacon data");
 813                 os_free(head);
 814                 os_free(tail);
 815                 return -1;
 816         }
 817
 818         head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 819                                            WLAN_FC_STYPE_BEACON);
 820         head->duration = host_to_le16(0);
 821         os_memset(head->da, 0xff, ETH_ALEN);
 822
 823         os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
 824         os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
 825         head->u.beacon.beacon_int =
 826                 host_to_le16(hapd->iconf->beacon_int);
 827
 828         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 829         capab_info = hostapd_own_capab_info(hapd);
 830         head->u.beacon.capab_info = host_to_le16(capab_info);
 831         pos = &head->u.beacon.variable[0];
 832
 833         /* SSID */
 834         *pos++ = WLAN_EID_SSID;
 835         if (hapd->conf->ignore_broadcast_ssid == 2) {
 836                 /* clear the data, but keep the correct length of the SSID */
 837                 *pos++ = hapd->conf->ssid.ssid_len;
 838                 os_memset(pos, 0, hapd->conf->ssid.ssid_len);
 839                 pos += hapd->conf->ssid.ssid_len;
 840         } else if (hapd->conf->ignore_broadcast_ssid) {
 841                 *pos++ = 0; /* empty SSID */
 842         } else {
 843                 *pos++ = hapd->conf->ssid.ssid_len;
 844                 os_memcpy(pos, hapd->conf->ssid.ssid,
 845                           hapd->conf->ssid.ssid_len);
 846                 pos += hapd->conf->ssid.ssid_len;
 847         }
 848
 849         /* Supported rates */
 850         pos = hostapd_eid_supp_rates(hapd, pos);
 851
 852         /* DS Params */
 853         pos = hostapd_eid_ds_params(hapd, pos);
 854
 855         head_len = pos - (u8 *) head;
 856
 857         tailpos = hostapd_eid_country(hapd, tailpos,
 858                                       tail + BEACON_TAIL_BUF_SIZE - tailpos);
 859
 860         /* Power Constraint element */
 861         tailpos = hostapd_eid_pwr_constraint(hapd, tailpos);
 862
 863         /* ERP Information element */
 864         tailpos = hostapd_eid_erp_info(hapd, tailpos);
 865
 866         /* Extended supported rates */
 867         tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
 868
 869         /* RSN, MDIE, WPA */
 870         tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
 871                                   tailpos);
 872
 873         tailpos = hostapd_eid_rm_enabled_capab(hapd, tailpos,
 874                                                tail + BEACON_TAIL_BUF_SIZE -
 875                                                tailpos);
 876
 877         tailpos = hostapd_eid_bss_load(hapd, tailpos,
 878                                        tail + BEACON_TAIL_BUF_SIZE - tailpos);
 879
 880 #ifdef CONFIG_IEEE80211N
 881         tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
 882         tailpos = hostapd_eid_ht_operation(hapd, tailpos);
 883 #endif /* CONFIG_IEEE80211N */
 884
 885         tailpos = hostapd_eid_ext_capab(hapd, tailpos);
 886
 887         /*
 888          * TODO: Time Advertisement element should only be included in some
 889          * DTIM Beacon frames.
 890          */
 891         tailpos = hostapd_eid_time_adv(hapd, tailpos);
 892
 893         tailpos = hostapd_eid_interworking(hapd, tailpos);
 894         tailpos = hostapd_eid_adv_proto(hapd, tailpos);
 895         tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
 896         tailpos = hostapd_add_csa_elems(hapd, tailpos, tail,
 897                                         &hapd->cs_c_off_beacon);
 898 #ifdef CONFIG_IEEE80211AC
 899         if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) {
 900                 tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
 901                 tailpos = hostapd_eid_vht_operation(hapd, tailpos);
 902         }
 903         if (hapd->conf->vendor_vht)
 904                 tailpos = hostapd_eid_vendor_vht(hapd, tailpos);
 905 #endif /* CONFIG_IEEE80211AC */
 906
 907         /* Wi-Fi Alliance WMM */
 908         tailpos = hostapd_eid_wmm(hapd, tailpos);
 909
 910 #ifdef CONFIG_WPS
 911         if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
 912                 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
 913                           wpabuf_len(hapd->wps_beacon_ie));
 914                 tailpos += wpabuf_len(hapd->wps_beacon_ie);
 915         }
 916 #endif /* CONFIG_WPS */
 917
 918 #ifdef CONFIG_P2P
 919         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
 920                 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
 921                           wpabuf_len(hapd->p2p_beacon_ie));
 922                 tailpos += wpabuf_len(hapd->p2p_beacon_ie);
 923         }
 924 #endif /* CONFIG_P2P */
 925 #ifdef CONFIG_P2P_MANAGER
 926         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 927             P2P_MANAGE)
 928                 tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
 929 #endif /* CONFIG_P2P_MANAGER */
 930
 931 #ifdef CONFIG_HS20
 932         tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
 933         tailpos = hostapd_eid_osen(hapd, tailpos);
 934 #endif /* CONFIG_HS20 */
 935
 936         if (hapd->conf->vendor_elements) {
 937                 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
 938                           wpabuf_len(hapd->conf->vendor_elements));
 939                 tailpos += wpabuf_len(hapd->conf->vendor_elements);
 940         }
 941
 942         tail_len = tailpos > tail ? tailpos - tail : 0;
 943
 944         resp = hostapd_probe_resp_offloads(hapd, &resp_len);
 945 #endif /* NEED_AP_MLME */
 946
 947         os_memset(params, 0, sizeof(*params));
 948         params->head = (u8 *) head;
 949         params->head_len = head_len;
 950         params->tail = tail;
 951         params->tail_len = tail_len;
 952         params->proberesp = resp;
 953         params->proberesp_len = resp_len;
 954         params->dtim_period = hapd->conf->dtim_period;
 955         params->beacon_int = hapd->iconf->beacon_int;
 956         params->basic_rates = hapd->iface->basic_rates;
 957         params->ssid = hapd->conf->ssid.ssid;
 958         params->ssid_len = hapd->conf->ssid.ssid_len;
 959         if ((hapd->conf->wpa & (WPA_PROTO_WPA | WPA_PROTO_RSN)) ==
 960             (WPA_PROTO_WPA | WPA_PROTO_RSN))
 961                 params->pairwise_ciphers = hapd->conf->wpa_pairwise |
 962                         hapd->conf->rsn_pairwise;
 963         else if (hapd->conf->wpa & WPA_PROTO_RSN)
 964                 params->pairwise_ciphers = hapd->conf->rsn_pairwise;
 965         else if (hapd->conf->wpa & WPA_PROTO_WPA)
 966                 params->pairwise_ciphers = hapd->conf->wpa_pairwise;
 967         params->group_cipher = hapd->conf->wpa_group;
 968         params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
 969         params->auth_algs = hapd->conf->auth_algs;
 970         params->wpa_version = hapd->conf->wpa;
 971         params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
 972                 (hapd->conf->ieee802_1x &&
 973                  (hapd->conf->default_wep_key_len ||
 974                   hapd->conf->individual_wep_key_len));
 975         switch (hapd->conf->ignore_broadcast_ssid) {
 976         case 0:
 977                 params->hide_ssid = NO_SSID_HIDING;
 978                 break;
 979         case 1:
 980                 params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
 981                 break;
 982         case 2:
 983                 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
 984                 break;
 985         }
 986         params->isolate = hapd->conf->isolate;
 987         params->smps_mode = hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_MASK;
 988 #ifdef NEED_AP_MLME
 989         params->cts_protect = !!(ieee802_11_erp_info(hapd) &
 990                                 ERP_INFO_USE_PROTECTION);
 991         params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
 992                 hapd->iconf->preamble == SHORT_PREAMBLE;
 993         if (hapd->iface->current_mode &&
 994             hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
 995                 params->short_slot_time =
 996                         hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
 997         else
 998                 params->short_slot_time = -1;
 999         if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
1000                 params->ht_opmode = -1;
1001         else
1002                 params->ht_opmode = hapd->iface->ht_op_mode;
1003 #endif /* NEED_AP_MLME */
1004         params->interworking = hapd->conf->interworking;
1005         if (hapd->conf->interworking &&
1006             !is_zero_ether_addr(hapd->conf->hessid))
1007                 params->hessid = hapd->conf->hessid;
1008         params->access_network_type = hapd->conf->access_network_type;
1009         params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
1010 #ifdef CONFIG_P2P
1011         params->p2p_go_ctwindow = hapd->iconf->p2p_go_ctwindow;
1012 #endif /* CONFIG_P2P */
1013 #ifdef CONFIG_HS20
1014         params->disable_dgaf = hapd->conf->disable_dgaf;
1015         if (hapd->conf->osen) {
1016                 params->privacy = 1;
1017                 params->osen = 1;
1018         }
1019 #endif /* CONFIG_HS20 */
1020         return 0;
1021 }
1022
1023
1024 void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
1025 {
1026         os_free(params->tail);
1027         params->tail = NULL;
1028         os_free(params->head);
1029         params->head = NULL;
1030         os_free(params->proberesp);
1031         params->proberesp = NULL;
1032 }
1033
1034
1035 int ieee802_11_set_beacon(struct hostapd_data *hapd)
1036 {
1037         struct wpa_driver_ap_params params;
1038         struct hostapd_freq_params freq;
1039         struct hostapd_iface *iface = hapd->iface;
1040         struct hostapd_config *iconf = iface->conf;
1041         struct wpabuf *beacon, *proberesp, *assocresp;
1042         int res, ret = -1;
1043
1044         if (hapd->csa_in_progress) {
1045                 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
1046                 return -1;
1047         }
1048
1049         hapd->beacon_set_done = 1;
1050
1051         if (ieee802_11_build_ap_params(hapd, &params) < 0)
1052                 return -1;
1053
1054         if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
1055             0)
1056                 goto fail;
1057
1058         params.beacon_ies = beacon;
1059         params.proberesp_ies = proberesp;
1060         params.assocresp_ies = assocresp;
1061         params.reenable = hapd->reenable_beacon;
1062         hapd->reenable_beacon = 0;
1063
1064         if (iface->current_mode &&
1065             hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq,
1066                                     iconf->channel, iconf->ieee80211n,
1067                                     iconf->ieee80211ac,
1068                                     iconf->secondary_channel,
1069                                     iconf->vht_oper_chwidth,
1070                                     iconf->vht_oper_centr_freq_seg0_idx,
1071                                     iconf->vht_oper_centr_freq_seg1_idx,
1072                                     iface->current_mode->vht_capab) == 0)
1073                 params.freq = &freq;
1074
1075         res = hostapd_drv_set_ap(hapd, &params);
1076         hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
1077         if (res)
1078                 wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
1079         else
1080                 ret = 0;
1081 fail:
1082         ieee802_11_free_ap_params(&params);
1083         return ret;
1084 }
1085
1086
1087 int ieee802_11_set_beacons(struct hostapd_iface *iface)
1088 {
1089         size_t i;
1090         int ret = 0;
1091
1092         for (i = 0; i < iface->num_bss; i++) {
1093                 if (iface->bss[i]->started &&
1094                     ieee802_11_set_beacon(iface->bss[i]) < 0)
1095                         ret = -1;
1096         }
1097
1098         return ret;
1099 }
1100
1101
1102 /* only update beacons if started */
1103 int ieee802_11_update_beacons(struct hostapd_iface *iface)
1104 {
1105         size_t i;
1106         int ret = 0;
1107
1108         for (i = 0; i < iface->num_bss; i++) {
1109                 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started &&
1110                     ieee802_11_set_beacon(iface->bss[i]) < 0)
1111                         ret = -1;
1112         }
1113
1114         return ret;
1115 }
1116
1117 #endif /* CONFIG_NATIVE_WINDOWS */