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