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         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, sta, 1));
 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         struct sta_info *sta = NULL;
 551         size_t i, resp_len;
 552         int noack;
 553         enum ssid_match_result res;
 554
 555         ie = mgmt->u.probe_req.variable;
 556         if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
 557                 return;
 558         ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
 559
 560         for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
 561                 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
 562                                             mgmt->sa, mgmt->da, mgmt->bssid,
 563                                             ie, ie_len, ssi_signal) > 0)
 564                         return;
 565
 566         if (!hapd->iconf->send_probe_response)
 567                 return;
 568
 569         if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
 570                 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
 571                            MAC2STR(mgmt->sa));
 572                 return;
 573         }
 574
 575         if ((!elems.ssid || !elems.supp_rates)) {
 576                 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
 577                            "without SSID or supported rates element",
 578                            MAC2STR(mgmt->sa));
 579                 return;
 580         }
 581
 582 #ifdef CONFIG_P2P
 583         if (hapd->p2p && elems.wps_ie) {
 584                 struct wpabuf *wps;
 585                 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
 586                 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
 587                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 588                                    "due to mismatch with Requested Device "
 589                                    "Type");
 590                         wpabuf_free(wps);
 591                         return;
 592                 }
 593                 wpabuf_free(wps);
 594         }
 595
 596         if (hapd->p2p && elems.p2p) {
 597                 struct wpabuf *p2p;
 598                 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
 599                 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
 600                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 601                                    "due to mismatch with Device ID");
 602                         wpabuf_free(p2p);
 603                         return;
 604                 }
 605                 wpabuf_free(p2p);
 606         }
 607 #endif /* CONFIG_P2P */
 608
 609         if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
 610             elems.ssid_list_len == 0) {
 611                 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
 612                            "broadcast SSID ignored", MAC2STR(mgmt->sa));
 613                 return;
 614         }
 615
 616         sta = ap_get_sta(hapd, mgmt->sa);
 617
 618 #ifdef CONFIG_P2P
 619         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 620             elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
 621             os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
 622                       P2P_WILDCARD_SSID_LEN) == 0) {
 623                 /* Process P2P Wildcard SSID like Wildcard SSID */
 624                 elems.ssid_len = 0;
 625         }
 626 #endif /* CONFIG_P2P */
 627
 628         res = ssid_match(hapd, elems.ssid, elems.ssid_len,
 629                          elems.ssid_list, elems.ssid_list_len);
 630         if (res != NO_SSID_MATCH) {
 631                 if (sta)
 632                         sta->ssid_probe = &hapd->conf->ssid;
 633         } else {
 634                 if (!(mgmt->da[0] & 0x01)) {
 635                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 636                                    " for foreign SSID '%s' (DA " MACSTR ")%s",
 637                                    MAC2STR(mgmt->sa),
 638                                    wpa_ssid_txt(elems.ssid, elems.ssid_len),
 639                                    MAC2STR(mgmt->da),
 640                                    elems.ssid_list ? " (SSID list)" : "");
 641                 }
 642                 return;
 643         }
 644
 645 #ifdef CONFIG_INTERWORKING
 646         if (hapd->conf->interworking &&
 647             elems.interworking && elems.interworking_len >= 1) {
 648                 u8 ant = elems.interworking[0] & 0x0f;
 649                 if (ant != INTERWORKING_ANT_WILDCARD &&
 650                     ant != hapd->conf->access_network_type) {
 651                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 652                                    " for mismatching ANT %u ignored",
 653                                    MAC2STR(mgmt->sa), ant);
 654                         return;
 655                 }
 656         }
 657
 658         if (hapd->conf->interworking && elems.interworking &&
 659             (elems.interworking_len == 7 || elems.interworking_len == 9)) {
 660                 const u8 *hessid;
 661                 if (elems.interworking_len == 7)
 662                         hessid = elems.interworking + 1;
 663                 else
 664                         hessid = elems.interworking + 1 + 2;
 665                 if (!is_broadcast_ether_addr(hessid) &&
 666                     os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
 667                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 668                                    " for mismatching HESSID " MACSTR
 669                                    " ignored",
 670                                    MAC2STR(mgmt->sa), MAC2STR(hessid));
 671                         return;
 672                 }
 673         }
 674 #endif /* CONFIG_INTERWORKING */
 675
 676 #ifdef CONFIG_P2P
 677         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 678             supp_rates_11b_only(&elems)) {
 679                 /* Indicates support for 11b rates only */
 680                 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
 681                            MACSTR " with only 802.11b rates",
 682                            MAC2STR(mgmt->sa));
 683                 return;
 684         }
 685 #endif /* CONFIG_P2P */
 686
 687         /* TODO: verify that supp_rates contains at least one matching rate
 688          * with AP configuration */
 689
 690 #ifdef CONFIG_TESTING_OPTIONS
 691         if (hapd->iconf->ignore_probe_probability > 0.0 &&
 692             drand48() < hapd->iconf->ignore_probe_probability) {
 693                 wpa_printf(MSG_INFO,
 694                            "TESTING: ignoring probe request from " MACSTR,
 695                            MAC2STR(mgmt->sa));
 696                 return;
 697         }
 698 #endif /* CONFIG_TESTING_OPTIONS */
 699
 700         resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL,
 701                                       &resp_len);
 702         if (resp == NULL)
 703                 return;
 704
 705         /*
 706          * If this is a broadcast probe request, apply no ack policy to avoid
 707          * excessive retries.
 708          */
 709         noack = !!(res == WILDCARD_SSID_MATCH &&
 710                    is_broadcast_ether_addr(mgmt->da));
 711
 712         if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
 713                 wpa_printf(MSG_INFO, "handle_probe_req: send failed");
 714
 715         os_free(resp);
 716
 717         wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
 718                    "SSID", MAC2STR(mgmt->sa),
 719                    elems.ssid_len == 0 ? "broadcast" : "our");
 720 }
 721
 722
 723 static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
 724                                         size_t *resp_len)
 725 {
 726         /* check probe response offloading caps and print warnings */
 727         if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
 728                 return NULL;
 729
 730 #ifdef CONFIG_WPS
 731         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
 732             (!(hapd->iface->probe_resp_offloads &
 733                (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
 734                 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
 735                 wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
 736                            "Probe Response while not supporting this");
 737 #endif /* CONFIG_WPS */
 738
 739 #ifdef CONFIG_P2P
 740         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
 741             !(hapd->iface->probe_resp_offloads &
 742               WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
 743                 wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
 744                            "Probe Response while not supporting this");
 745 #endif  /* CONFIG_P2P */
 746
 747         if (hapd->conf->interworking &&
 748             !(hapd->iface->probe_resp_offloads &
 749               WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
 750                 wpa_printf(MSG_WARNING, "Device is trying to offload "
 751                            "Interworking Probe Response while not supporting "
 752                            "this");
 753
 754         /* Generate a Probe Response template for the non-P2P case */
 755         return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len);
 756 }
 757
 758 #endif /* NEED_AP_MLME */
 759
 760
 761 int ieee802_11_build_ap_params(struct hostapd_data *hapd,
 762                                struct wpa_driver_ap_params *params)
 763 {
 764         struct ieee80211_mgmt *head = NULL;
 765         u8 *tail = NULL;
 766         size_t head_len = 0, tail_len = 0;
 767         u8 *resp = NULL;
 768         size_t resp_len = 0;
 769 #ifdef NEED_AP_MLME
 770         u16 capab_info;
 771         u8 *pos, *tailpos;
 772
 773 #define BEACON_HEAD_BUF_SIZE 256
 774 #define BEACON_TAIL_BUF_SIZE 512
 775         head = os_zalloc(BEACON_HEAD_BUF_SIZE);
 776         tail_len = BEACON_TAIL_BUF_SIZE;
 777 #ifdef CONFIG_WPS
 778         if (hapd->conf->wps_state && hapd->wps_beacon_ie)
 779                 tail_len += wpabuf_len(hapd->wps_beacon_ie);
 780 #endif /* CONFIG_WPS */
 781 #ifdef CONFIG_P2P
 782         if (hapd->p2p_beacon_ie)
 783                 tail_len += wpabuf_len(hapd->p2p_beacon_ie);
 784 #endif /* CONFIG_P2P */
 785         if (hapd->conf->vendor_elements)
 786                 tail_len += wpabuf_len(hapd->conf->vendor_elements);
 787
 788 #ifdef CONFIG_IEEE80211AC
 789         if (hapd->conf->vendor_vht) {
 790                 tail_len += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) +
 791                         2 + sizeof(struct ieee80211_vht_operation);
 792         }
 793 #endif /* CONFIG_IEEE80211AC */
 794
 795         tailpos = tail = os_malloc(tail_len);
 796         if (head == NULL || tail == NULL) {
 797                 wpa_printf(MSG_ERROR, "Failed to set beacon data");
 798                 os_free(head);
 799                 os_free(tail);
 800                 return -1;
 801         }
 802
 803         head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 804                                            WLAN_FC_STYPE_BEACON);
 805         head->duration = host_to_le16(0);
 806         os_memset(head->da, 0xff, ETH_ALEN);
 807
 808         os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
 809         os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
 810         head->u.beacon.beacon_int =
 811                 host_to_le16(hapd->iconf->beacon_int);
 812
 813         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 814         capab_info = hostapd_own_capab_info(hapd, NULL, 0);
 815         head->u.beacon.capab_info = host_to_le16(capab_info);
 816         pos = &head->u.beacon.variable[0];
 817
 818         /* SSID */
 819         *pos++ = WLAN_EID_SSID;
 820         if (hapd->conf->ignore_broadcast_ssid == 2) {
 821                 /* clear the data, but keep the correct length of the SSID */
 822                 *pos++ = hapd->conf->ssid.ssid_len;
 823                 os_memset(pos, 0, hapd->conf->ssid.ssid_len);
 824                 pos += hapd->conf->ssid.ssid_len;
 825         } else if (hapd->conf->ignore_broadcast_ssid) {
 826                 *pos++ = 0; /* empty SSID */
 827         } else {
 828                 *pos++ = hapd->conf->ssid.ssid_len;
 829                 os_memcpy(pos, hapd->conf->ssid.ssid,
 830                           hapd->conf->ssid.ssid_len);
 831                 pos += hapd->conf->ssid.ssid_len;
 832         }
 833
 834         /* Supported rates */
 835         pos = hostapd_eid_supp_rates(hapd, pos);
 836
 837         /* DS Params */
 838         pos = hostapd_eid_ds_params(hapd, pos);
 839
 840         head_len = pos - (u8 *) head;
 841
 842         tailpos = hostapd_eid_country(hapd, tailpos,
 843                                       tail + BEACON_TAIL_BUF_SIZE - tailpos);
 844
 845         /* Power Constraint element */
 846         tailpos = hostapd_eid_pwr_constraint(hapd, tailpos);
 847
 848         /* ERP Information element */
 849         tailpos = hostapd_eid_erp_info(hapd, tailpos);
 850
 851         /* Extended supported rates */
 852         tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
 853
 854         /* RSN, MDIE, WPA */
 855         tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
 856                                   tailpos);
 857
 858         tailpos = hostapd_eid_rm_enabled_capab(hapd, tailpos,
 859                                                tail + BEACON_TAIL_BUF_SIZE -
 860                                                tailpos);
 861
 862         tailpos = hostapd_eid_bss_load(hapd, tailpos,
 863                                        tail + BEACON_TAIL_BUF_SIZE - tailpos);
 864
 865 #ifdef CONFIG_IEEE80211N
 866         tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
 867         tailpos = hostapd_eid_ht_operation(hapd, tailpos);
 868 #endif /* CONFIG_IEEE80211N */
 869
 870         tailpos = hostapd_eid_ext_capab(hapd, tailpos);
 871
 872         /*
 873          * TODO: Time Advertisement element should only be included in some
 874          * DTIM Beacon frames.
 875          */
 876         tailpos = hostapd_eid_time_adv(hapd, tailpos);
 877
 878         tailpos = hostapd_eid_interworking(hapd, tailpos);
 879         tailpos = hostapd_eid_adv_proto(hapd, tailpos);
 880         tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
 881         tailpos = hostapd_add_csa_elems(hapd, tailpos, tail,
 882                                         &hapd->cs_c_off_beacon);
 883 #ifdef CONFIG_IEEE80211AC
 884         if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) {
 885                 tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
 886                 tailpos = hostapd_eid_vht_operation(hapd, tailpos);
 887         }
 888         if (hapd->conf->vendor_vht)
 889                 tailpos = hostapd_eid_vendor_vht(hapd, tailpos);
 890 #endif /* CONFIG_IEEE80211AC */
 891
 892         /* Wi-Fi Alliance WMM */
 893         tailpos = hostapd_eid_wmm(hapd, tailpos);
 894
 895 #ifdef CONFIG_WPS
 896         if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
 897                 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
 898                           wpabuf_len(hapd->wps_beacon_ie));
 899                 tailpos += wpabuf_len(hapd->wps_beacon_ie);
 900         }
 901 #endif /* CONFIG_WPS */
 902
 903 #ifdef CONFIG_P2P
 904         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
 905                 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
 906                           wpabuf_len(hapd->p2p_beacon_ie));
 907                 tailpos += wpabuf_len(hapd->p2p_beacon_ie);
 908         }
 909 #endif /* CONFIG_P2P */
 910 #ifdef CONFIG_P2P_MANAGER
 911         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 912             P2P_MANAGE)
 913                 tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
 914 #endif /* CONFIG_P2P_MANAGER */
 915
 916 #ifdef CONFIG_HS20
 917         tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
 918         tailpos = hostapd_eid_osen(hapd, tailpos);
 919 #endif /* CONFIG_HS20 */
 920
 921         if (hapd->conf->vendor_elements) {
 922                 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
 923                           wpabuf_len(hapd->conf->vendor_elements));
 924                 tailpos += wpabuf_len(hapd->conf->vendor_elements);
 925         }
 926
 927         tail_len = tailpos > tail ? tailpos - tail : 0;
 928
 929         resp = hostapd_probe_resp_offloads(hapd, &resp_len);
 930 #endif /* NEED_AP_MLME */
 931
 932         os_memset(params, 0, sizeof(*params));
 933         params->head = (u8 *) head;
 934         params->head_len = head_len;
 935         params->tail = tail;
 936         params->tail_len = tail_len;
 937         params->proberesp = resp;
 938         params->proberesp_len = resp_len;
 939         params->dtim_period = hapd->conf->dtim_period;
 940         params->beacon_int = hapd->iconf->beacon_int;
 941         params->basic_rates = hapd->iface->basic_rates;
 942         params->ssid = hapd->conf->ssid.ssid;
 943         params->ssid_len = hapd->conf->ssid.ssid_len;
 944         params->pairwise_ciphers = hapd->conf->wpa_pairwise |
 945                 hapd->conf->rsn_pairwise;
 946         params->group_cipher = hapd->conf->wpa_group;
 947         params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
 948         params->auth_algs = hapd->conf->auth_algs;
 949         params->wpa_version = hapd->conf->wpa;
 950         params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
 951                 (hapd->conf->ieee802_1x &&
 952                  (hapd->conf->default_wep_key_len ||
 953                   hapd->conf->individual_wep_key_len));
 954         switch (hapd->conf->ignore_broadcast_ssid) {
 955         case 0:
 956                 params->hide_ssid = NO_SSID_HIDING;
 957                 break;
 958         case 1:
 959                 params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
 960                 break;
 961         case 2:
 962                 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
 963                 break;
 964         }
 965         params->isolate = hapd->conf->isolate;
 966         params->smps_mode = hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_MASK;
 967 #ifdef NEED_AP_MLME
 968         params->cts_protect = !!(ieee802_11_erp_info(hapd) &
 969                                 ERP_INFO_USE_PROTECTION);
 970         params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
 971                 hapd->iconf->preamble == SHORT_PREAMBLE;
 972         if (hapd->iface->current_mode &&
 973             hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
 974                 params->short_slot_time =
 975                         hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
 976         else
 977                 params->short_slot_time = -1;
 978         if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
 979                 params->ht_opmode = -1;
 980         else
 981                 params->ht_opmode = hapd->iface->ht_op_mode;
 982 #endif /* NEED_AP_MLME */
 983         params->interworking = hapd->conf->interworking;
 984         if (hapd->conf->interworking &&
 985             !is_zero_ether_addr(hapd->conf->hessid))
 986                 params->hessid = hapd->conf->hessid;
 987         params->access_network_type = hapd->conf->access_network_type;
 988         params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
 989 #ifdef CONFIG_HS20
 990         params->disable_dgaf = hapd->conf->disable_dgaf;
 991         if (hapd->conf->osen) {
 992                 params->privacy = 1;
 993                 params->osen = 1;
 994         }
 995 #endif /* CONFIG_HS20 */
 996         return 0;
 997 }
 998
 999
1000 void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
1001 {
1002         os_free(params->tail);
1003         params->tail = NULL;
1004         os_free(params->head);
1005         params->head = NULL;
1006         os_free(params->proberesp);
1007         params->proberesp = NULL;
1008 }
1009
1010
1011 int ieee802_11_set_beacon(struct hostapd_data *hapd)
1012 {
1013         struct wpa_driver_ap_params params;
1014         struct hostapd_freq_params freq;
1015         struct hostapd_iface *iface = hapd->iface;
1016         struct hostapd_config *iconf = iface->conf;
1017         struct wpabuf *beacon, *proberesp, *assocresp;
1018         int res, ret = -1;
1019
1020         if (hapd->csa_in_progress) {
1021                 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
1022                 return -1;
1023         }
1024
1025         hapd->beacon_set_done = 1;
1026
1027         if (ieee802_11_build_ap_params(hapd, &params) < 0)
1028                 return -1;
1029
1030         if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
1031             0)
1032                 goto fail;
1033
1034         params.beacon_ies = beacon;
1035         params.proberesp_ies = proberesp;
1036         params.assocresp_ies = assocresp;
1037
1038         if (iface->current_mode &&
1039             hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq,
1040                                     iconf->channel, iconf->ieee80211n,
1041                                     iconf->ieee80211ac,
1042                                     iconf->secondary_channel,
1043                                     iconf->vht_oper_chwidth,
1044                                     iconf->vht_oper_centr_freq_seg0_idx,
1045                                     iconf->vht_oper_centr_freq_seg1_idx,
1046                                     iface->current_mode->vht_capab) == 0)
1047                 params.freq = &freq;
1048
1049         res = hostapd_drv_set_ap(hapd, &params);
1050         hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
1051         if (res)
1052                 wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
1053         else
1054                 ret = 0;
1055 fail:
1056         ieee802_11_free_ap_params(&params);
1057         return ret;
1058 }
1059
1060
1061 int ieee802_11_set_beacons(struct hostapd_iface *iface)
1062 {
1063         size_t i;
1064         int ret = 0;
1065
1066         for (i = 0; i < iface->num_bss; i++) {
1067                 if (iface->bss[i]->started &&
1068                     ieee802_11_set_beacon(iface->bss[i]) < 0)
1069                         ret = -1;
1070         }
1071
1072         return ret;
1073 }
1074
1075
1076 /* only update beacons if started */
1077 int ieee802_11_update_beacons(struct hostapd_iface *iface)
1078 {
1079         size_t i;
1080         int ret = 0;
1081
1082         for (i = 0; i < iface->num_bss; i++) {
1083                 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started &&
1084                     ieee802_11_set_beacon(iface->bss[i]) < 0)
1085                         ret = -1;
1086         }
1087
1088         return ret;
1089 }
1090
1091 #endif /* CONFIG_NATIVE_WINDOWS */