contrib/hostapd/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
  31
  32 #ifdef NEED_AP_MLME
  33
  34 static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len)
  35 {
  36 #ifdef CONFIG_TESTING_OPTIONS
  37         if (hapd->conf->bss_load_test_set) {
  38                 if (2 + 5 > len)
  39                         return eid;
  40                 *eid++ = WLAN_EID_BSS_LOAD;
  41                 *eid++ = 5;
  42                 os_memcpy(eid, hapd->conf->bss_load_test, 5);
  43                 eid += 5;
  44         }
  45 #endif /* CONFIG_TESTING_OPTIONS */
  46         return eid;
  47 }
  48
  49
  50 static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
  51 {
  52         u8 erp = 0;
  53
  54         if (hapd->iface->current_mode == NULL ||
  55             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  56                 return 0;
  57
  58         if (hapd->iface->olbc)
  59                 erp |= ERP_INFO_USE_PROTECTION;
  60         if (hapd->iface->num_sta_non_erp > 0) {
  61                 erp |= ERP_INFO_NON_ERP_PRESENT |
  62                         ERP_INFO_USE_PROTECTION;
  63         }
  64         if (hapd->iface->num_sta_no_short_preamble > 0 ||
  65             hapd->iconf->preamble == LONG_PREAMBLE)
  66                 erp |= ERP_INFO_BARKER_PREAMBLE_MODE;
  67
  68         return erp;
  69 }
  70
  71
  72 static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid)
  73 {
  74         *eid++ = WLAN_EID_DS_PARAMS;
  75         *eid++ = 1;
  76         *eid++ = hapd->iconf->channel;
  77         return eid;
  78 }
  79
  80
  81 static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
  82 {
  83         if (hapd->iface->current_mode == NULL ||
  84             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  85                 return eid;
  86
  87         /* Set NonERP_present and use_protection bits if there
  88          * are any associated NonERP stations. */
  89         /* TODO: use_protection bit can be set to zero even if
  90          * there are NonERP stations present. This optimization
  91          * might be useful if NonERP stations are "quiet".
  92          * See 802.11g/D6 E-1 for recommended practice.
  93          * In addition, Non ERP present might be set, if AP detects Non ERP
  94          * operation on other APs. */
  95
  96         /* Add ERP Information element */
  97         *eid++ = WLAN_EID_ERP_INFO;
  98         *eid++ = 1;
  99         *eid++ = ieee802_11_erp_info(hapd);
 100
 101         return eid;
 102 }
 103
 104
 105 static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing,
 106                                     struct hostapd_channel_data *start,
 107                                     struct hostapd_channel_data *prev)
 108 {
 109         if (end - pos < 3)
 110                 return pos;
 111
 112         /* first channel number */
 113         *pos++ = start->chan;
 114         /* number of channels */
 115         *pos++ = (prev->chan - start->chan) / chan_spacing + 1;
 116         /* maximum transmit power level */
 117         *pos++ = start->max_tx_power;
 118
 119         return pos;
 120 }
 121
 122
 123 static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
 124                                 int max_len)
 125 {
 126         u8 *pos = eid;
 127         u8 *end = eid + max_len;
 128         int i;
 129         struct hostapd_hw_modes *mode;
 130         struct hostapd_channel_data *start, *prev;
 131         int chan_spacing = 1;
 132
 133         if (!hapd->iconf->ieee80211d || max_len < 6 ||
 134             hapd->iface->current_mode == NULL)
 135                 return eid;
 136
 137         *pos++ = WLAN_EID_COUNTRY;
 138         pos++; /* length will be set later */
 139         os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
 140         pos += 3;
 141
 142         mode = hapd->iface->current_mode;
 143         if (mode->mode == HOSTAPD_MODE_IEEE80211A)
 144                 chan_spacing = 4;
 145
 146         start = prev = NULL;
 147         for (i = 0; i < mode->num_channels; i++) {
 148                 struct hostapd_channel_data *chan = &mode->channels[i];
 149                 if (chan->flag & HOSTAPD_CHAN_DISABLED)
 150                         continue;
 151                 if (start && prev &&
 152                     prev->chan + chan_spacing == chan->chan &&
 153                     start->max_tx_power == chan->max_tx_power) {
 154                         prev = chan;
 155                         continue; /* can use same entry */
 156                 }
 157
 158                 if (start) {
 159                         pos = hostapd_eid_country_add(pos, end, chan_spacing,
 160                                                       start, prev);
 161                         start = NULL;
 162                 }
 163
 164                 /* Start new group */
 165                 start = prev = chan;
 166         }
 167
 168         if (start) {
 169                 pos = hostapd_eid_country_add(pos, end, chan_spacing,
 170                                               start, prev);
 171         }
 172
 173         if ((pos - eid) & 1) {
 174                 if (end - pos < 1)
 175                         return eid;
 176                 *pos++ = 0; /* pad for 16-bit alignment */
 177         }
 178
 179         eid[1] = (pos - eid) - 2;
 180
 181         return pos;
 182 }
 183
 184
 185 static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len)
 186 {
 187         const u8 *ie;
 188         size_t ielen;
 189
 190         ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
 191         if (ie == NULL || ielen > len)
 192                 return eid;
 193
 194         os_memcpy(eid, ie, ielen);
 195         return eid + ielen;
 196 }
 197
 198
 199 static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid)
 200 {
 201         u8 chan;
 202
 203         if (!hapd->iface->cs_freq_params.freq)
 204                 return eid;
 205
 206         if (ieee80211_freq_to_chan(hapd->iface->cs_freq_params.freq, &chan) ==
 207             NUM_HOSTAPD_MODES)
 208                 return eid;
 209
 210         *eid++ = WLAN_EID_CHANNEL_SWITCH;
 211         *eid++ = 3;
 212         *eid++ = hapd->iface->cs_block_tx;
 213         *eid++ = chan;
 214         *eid++ = hapd->iface->cs_count;
 215
 216         return eid;
 217 }
 218
 219
 220 static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid)
 221 {
 222         u8 sec_ch;
 223
 224         if (!hapd->iface->cs_freq_params.sec_channel_offset)
 225                 return eid;
 226
 227         if (hapd->iface->cs_freq_params.sec_channel_offset == -1)
 228                 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW;
 229         else if (hapd->iface->cs_freq_params.sec_channel_offset == 1)
 230                 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE;
 231         else
 232                 return eid;
 233
 234         *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
 235         *eid++ = 1;
 236         *eid++ = sec_ch;
 237
 238         return eid;
 239 }
 240
 241
 242 static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos,
 243                                   u8 *start, unsigned int *csa_counter_off)
 244 {
 245         u8 *old_pos = pos;
 246
 247         if (!csa_counter_off)
 248                 return pos;
 249
 250         *csa_counter_off = 0;
 251         pos = hostapd_eid_csa(hapd, pos);
 252
 253         if (pos != old_pos) {
 254                 /* save an offset to the counter - should be last byte */
 255                 *csa_counter_off = pos - start - 1;
 256                 pos = hostapd_eid_secondary_channel(hapd, pos);
 257         }
 258
 259         return pos;
 260 }
 261
 262
 263 static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 264                                    struct sta_info *sta,
 265                                    const struct ieee80211_mgmt *req,
 266                                    int is_p2p, size_t *resp_len)
 267 {
 268         struct ieee80211_mgmt *resp;
 269         u8 *pos, *epos;
 270         size_t buflen;
 271
 272 #define MAX_PROBERESP_LEN 768
 273         buflen = MAX_PROBERESP_LEN;
 274 #ifdef CONFIG_WPS
 275         if (hapd->wps_probe_resp_ie)
 276                 buflen += wpabuf_len(hapd->wps_probe_resp_ie);
 277 #endif /* CONFIG_WPS */
 278 #ifdef CONFIG_P2P
 279         if (hapd->p2p_probe_resp_ie)
 280                 buflen += wpabuf_len(hapd->p2p_probe_resp_ie);
 281 #endif /* CONFIG_P2P */
 282         if (hapd->conf->vendor_elements)
 283                 buflen += wpabuf_len(hapd->conf->vendor_elements);
 284         resp = os_zalloc(buflen);
 285         if (resp == NULL)
 286                 return NULL;
 287
 288         epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
 289
 290         resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 291                                            WLAN_FC_STYPE_PROBE_RESP);
 292         if (req)
 293                 os_memcpy(resp->da, req->sa, ETH_ALEN);
 294         os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
 295
 296         os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
 297         resp->u.probe_resp.beacon_int =
 298                 host_to_le16(hapd->iconf->beacon_int);
 299
 300         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 301         resp->u.probe_resp.capab_info =
 302                 host_to_le16(hostapd_own_capab_info(hapd, sta, 1));
 303
 304         pos = resp->u.probe_resp.variable;
 305         *pos++ = WLAN_EID_SSID;
 306         *pos++ = hapd->conf->ssid.ssid_len;
 307         os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len);
 308         pos += hapd->conf->ssid.ssid_len;
 309
 310         /* Supported rates */
 311         pos = hostapd_eid_supp_rates(hapd, pos);
 312
 313         /* DS Params */
 314         pos = hostapd_eid_ds_params(hapd, pos);
 315
 316         pos = hostapd_eid_country(hapd, pos, epos - pos);
 317
 318         /* ERP Information element */
 319         pos = hostapd_eid_erp_info(hapd, pos);
 320
 321         /* Extended supported rates */
 322         pos = hostapd_eid_ext_supp_rates(hapd, pos);
 323
 324         /* RSN, MDIE, WPA */
 325         pos = hostapd_eid_wpa(hapd, pos, epos - pos);
 326
 327         pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
 328
 329 #ifdef CONFIG_IEEE80211N
 330         pos = hostapd_eid_ht_capabilities(hapd, pos);
 331         pos = hostapd_eid_ht_operation(hapd, pos);
 332 #endif /* CONFIG_IEEE80211N */
 333
 334         pos = hostapd_eid_ext_capab(hapd, pos);
 335
 336         pos = hostapd_eid_time_adv(hapd, pos);
 337         pos = hostapd_eid_time_zone(hapd, pos);
 338
 339         pos = hostapd_eid_interworking(hapd, pos);
 340         pos = hostapd_eid_adv_proto(hapd, pos);
 341         pos = hostapd_eid_roaming_consortium(hapd, pos);
 342
 343         pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp,
 344                                     &hapd->iface->cs_c_off_proberesp);
 345 #ifdef CONFIG_IEEE80211AC
 346         pos = hostapd_eid_vht_capabilities(hapd, pos);
 347         pos = hostapd_eid_vht_operation(hapd, pos);
 348 #endif /* CONFIG_IEEE80211AC */
 349
 350         /* Wi-Fi Alliance WMM */
 351         pos = hostapd_eid_wmm(hapd, pos);
 352
 353 #ifdef CONFIG_WPS
 354         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
 355                 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
 356                           wpabuf_len(hapd->wps_probe_resp_ie));
 357                 pos += wpabuf_len(hapd->wps_probe_resp_ie);
 358         }
 359 #endif /* CONFIG_WPS */
 360
 361 #ifdef CONFIG_P2P
 362         if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
 363             hapd->p2p_probe_resp_ie) {
 364                 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
 365                           wpabuf_len(hapd->p2p_probe_resp_ie));
 366                 pos += wpabuf_len(hapd->p2p_probe_resp_ie);
 367         }
 368 #endif /* CONFIG_P2P */
 369 #ifdef CONFIG_P2P_MANAGER
 370         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 371             P2P_MANAGE)
 372                 pos = hostapd_eid_p2p_manage(hapd, pos);
 373 #endif /* CONFIG_P2P_MANAGER */
 374
 375 #ifdef CONFIG_HS20
 376         pos = hostapd_eid_hs20_indication(hapd, pos);
 377 #endif /* CONFIG_HS20 */
 378
 379         if (hapd->conf->vendor_elements) {
 380                 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
 381                           wpabuf_len(hapd->conf->vendor_elements));
 382                 pos += wpabuf_len(hapd->conf->vendor_elements);
 383         }
 384
 385         *resp_len = pos - (u8 *) resp;
 386         return (u8 *) resp;
 387 }
 388
 389
 390 enum ssid_match_result {
 391         NO_SSID_MATCH,
 392         EXACT_SSID_MATCH,
 393         WILDCARD_SSID_MATCH
 394 };
 395
 396 static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
 397                                          const u8 *ssid, size_t ssid_len,
 398                                          const u8 *ssid_list,
 399                                          size_t ssid_list_len)
 400 {
 401         const u8 *pos, *end;
 402         int wildcard = 0;
 403
 404         if (ssid_len == 0)
 405                 wildcard = 1;
 406         if (ssid_len == hapd->conf->ssid.ssid_len &&
 407             os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
 408                 return EXACT_SSID_MATCH;
 409
 410         if (ssid_list == NULL)
 411                 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 412
 413         pos = ssid_list;
 414         end = ssid_list + ssid_list_len;
 415         while (pos + 1 <= end) {
 416                 if (pos + 2 + pos[1] > end)
 417                         break;
 418                 if (pos[1] == 0)
 419                         wildcard = 1;
 420                 if (pos[1] == hapd->conf->ssid.ssid_len &&
 421                     os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
 422                         return EXACT_SSID_MATCH;
 423                 pos += 2 + pos[1];
 424         }
 425
 426         return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 427 }
 428
 429
 430 void handle_probe_req(struct hostapd_data *hapd,
 431                       const struct ieee80211_mgmt *mgmt, size_t len,
 432                       int ssi_signal)
 433 {
 434         u8 *resp;
 435         struct ieee802_11_elems elems;
 436         const u8 *ie;
 437         size_t ie_len;
 438         struct sta_info *sta = NULL;
 439         size_t i, resp_len;
 440         int noack;
 441         enum ssid_match_result res;
 442
 443         ie = mgmt->u.probe_req.variable;
 444         if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
 445                 return;
 446         ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
 447
 448         for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
 449                 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
 450                                             mgmt->sa, mgmt->da, mgmt->bssid,
 451                                             ie, ie_len, ssi_signal) > 0)
 452                         return;
 453
 454         if (!hapd->iconf->send_probe_response)
 455                 return;
 456
 457         if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
 458                 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
 459                            MAC2STR(mgmt->sa));
 460                 return;
 461         }
 462
 463         if ((!elems.ssid || !elems.supp_rates)) {
 464                 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
 465                            "without SSID or supported rates element",
 466                            MAC2STR(mgmt->sa));
 467                 return;
 468         }
 469
 470 #ifdef CONFIG_P2P
 471         if (hapd->p2p && elems.wps_ie) {
 472                 struct wpabuf *wps;
 473                 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
 474                 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
 475                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 476                                    "due to mismatch with Requested Device "
 477                                    "Type");
 478                         wpabuf_free(wps);
 479                         return;
 480                 }
 481                 wpabuf_free(wps);
 482         }
 483
 484         if (hapd->p2p && elems.p2p) {
 485                 struct wpabuf *p2p;
 486                 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
 487                 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
 488                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 489                                    "due to mismatch with Device ID");
 490                         wpabuf_free(p2p);
 491                         return;
 492                 }
 493                 wpabuf_free(p2p);
 494         }
 495 #endif /* CONFIG_P2P */
 496
 497         if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
 498             elems.ssid_list_len == 0) {
 499                 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
 500                            "broadcast SSID ignored", MAC2STR(mgmt->sa));
 501                 return;
 502         }
 503
 504         sta = ap_get_sta(hapd, mgmt->sa);
 505
 506 #ifdef CONFIG_P2P
 507         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 508             elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
 509             os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
 510                       P2P_WILDCARD_SSID_LEN) == 0) {
 511                 /* Process P2P Wildcard SSID like Wildcard SSID */
 512                 elems.ssid_len = 0;
 513         }
 514 #endif /* CONFIG_P2P */
 515
 516         res = ssid_match(hapd, elems.ssid, elems.ssid_len,
 517                          elems.ssid_list, elems.ssid_list_len);
 518         if (res != NO_SSID_MATCH) {
 519                 if (sta)
 520                         sta->ssid_probe = &hapd->conf->ssid;
 521         } else {
 522                 if (!(mgmt->da[0] & 0x01)) {
 523                         char ssid_txt[33];
 524                         ieee802_11_print_ssid(ssid_txt, elems.ssid,
 525                                               elems.ssid_len);
 526                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 527                                    " for foreign SSID '%s' (DA " MACSTR ")%s",
 528                                    MAC2STR(mgmt->sa), ssid_txt,
 529                                    MAC2STR(mgmt->da),
 530                                    elems.ssid_list ? " (SSID list)" : "");
 531                 }
 532                 return;
 533         }
 534
 535 #ifdef CONFIG_INTERWORKING
 536         if (elems.interworking && elems.interworking_len >= 1) {
 537                 u8 ant = elems.interworking[0] & 0x0f;
 538                 if (ant != INTERWORKING_ANT_WILDCARD &&
 539                     ant != hapd->conf->access_network_type) {
 540                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 541                                    " for mismatching ANT %u ignored",
 542                                    MAC2STR(mgmt->sa), ant);
 543                         return;
 544                 }
 545         }
 546
 547         if (elems.interworking &&
 548             (elems.interworking_len == 7 || elems.interworking_len == 9)) {
 549                 const u8 *hessid;
 550                 if (elems.interworking_len == 7)
 551                         hessid = elems.interworking + 1;
 552                 else
 553                         hessid = elems.interworking + 1 + 2;
 554                 if (!is_broadcast_ether_addr(hessid) &&
 555                     os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
 556                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 557                                    " for mismatching HESSID " MACSTR
 558                                    " ignored",
 559                                    MAC2STR(mgmt->sa), MAC2STR(hessid));
 560                         return;
 561                 }
 562         }
 563 #endif /* CONFIG_INTERWORKING */
 564
 565 #ifdef CONFIG_P2P
 566         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 567             supp_rates_11b_only(&elems)) {
 568                 /* Indicates support for 11b rates only */
 569                 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
 570                            MACSTR " with only 802.11b rates",
 571                            MAC2STR(mgmt->sa));
 572                 return;
 573         }
 574 #endif /* CONFIG_P2P */
 575
 576         /* TODO: verify that supp_rates contains at least one matching rate
 577          * with AP configuration */
 578
 579 #ifdef CONFIG_TESTING_OPTIONS
 580         if (hapd->iconf->ignore_probe_probability > 0.0d &&
 581             drand48() < hapd->iconf->ignore_probe_probability) {
 582                 wpa_printf(MSG_INFO,
 583                            "TESTING: ignoring probe request from " MACSTR,
 584                            MAC2STR(mgmt->sa));
 585                 return;
 586         }
 587 #endif /* CONFIG_TESTING_OPTIONS */
 588
 589         resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL,
 590                                       &resp_len);
 591         if (resp == NULL)
 592                 return;
 593
 594         /*
 595          * If this is a broadcast probe request, apply no ack policy to avoid
 596          * excessive retries.
 597          */
 598         noack = !!(res == WILDCARD_SSID_MATCH &&
 599                    is_broadcast_ether_addr(mgmt->da));
 600
 601         if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
 602                 wpa_printf(MSG_INFO, "handle_probe_req: send failed");
 603
 604         os_free(resp);
 605
 606         wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
 607                    "SSID", MAC2STR(mgmt->sa),
 608                    elems.ssid_len == 0 ? "broadcast" : "our");
 609 }
 610
 611
 612 static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
 613                                         size_t *resp_len)
 614 {
 615         /* check probe response offloading caps and print warnings */
 616         if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
 617                 return NULL;
 618
 619 #ifdef CONFIG_WPS
 620         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
 621             (!(hapd->iface->probe_resp_offloads &
 622                (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
 623                 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
 624                 wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
 625                            "Probe Response while not supporting this");
 626 #endif /* CONFIG_WPS */
 627
 628 #ifdef CONFIG_P2P
 629         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
 630             !(hapd->iface->probe_resp_offloads &
 631               WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
 632                 wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
 633                            "Probe Response while not supporting this");
 634 #endif  /* CONFIG_P2P */
 635
 636         if (hapd->conf->interworking &&
 637             !(hapd->iface->probe_resp_offloads &
 638               WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
 639                 wpa_printf(MSG_WARNING, "Device is trying to offload "
 640                            "Interworking Probe Response while not supporting "
 641                            "this");
 642
 643         /* Generate a Probe Response template for the non-P2P case */
 644         return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len);
 645 }
 646
 647 #endif /* NEED_AP_MLME */
 648
 649
 650 int ieee802_11_build_ap_params(struct hostapd_data *hapd,
 651                                struct wpa_driver_ap_params *params)
 652 {
 653         struct ieee80211_mgmt *head = NULL;
 654         u8 *tail = NULL;
 655         size_t head_len = 0, tail_len = 0;
 656         u8 *resp = NULL;
 657         size_t resp_len = 0;
 658 #ifdef NEED_AP_MLME
 659         u16 capab_info;
 660         u8 *pos, *tailpos;
 661
 662 #define BEACON_HEAD_BUF_SIZE 256
 663 #define BEACON_TAIL_BUF_SIZE 512
 664         head = os_zalloc(BEACON_HEAD_BUF_SIZE);
 665         tail_len = BEACON_TAIL_BUF_SIZE;
 666 #ifdef CONFIG_WPS
 667         if (hapd->conf->wps_state && hapd->wps_beacon_ie)
 668                 tail_len += wpabuf_len(hapd->wps_beacon_ie);
 669 #endif /* CONFIG_WPS */
 670 #ifdef CONFIG_P2P
 671         if (hapd->p2p_beacon_ie)
 672                 tail_len += wpabuf_len(hapd->p2p_beacon_ie);
 673 #endif /* CONFIG_P2P */
 674         if (hapd->conf->vendor_elements)
 675                 tail_len += wpabuf_len(hapd->conf->vendor_elements);
 676         tailpos = tail = os_malloc(tail_len);
 677         if (head == NULL || tail == NULL) {
 678                 wpa_printf(MSG_ERROR, "Failed to set beacon data");
 679                 os_free(head);
 680                 os_free(tail);
 681                 return -1;
 682         }
 683
 684         head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 685                                            WLAN_FC_STYPE_BEACON);
 686         head->duration = host_to_le16(0);
 687         os_memset(head->da, 0xff, ETH_ALEN);
 688
 689         os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
 690         os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
 691         head->u.beacon.beacon_int =
 692                 host_to_le16(hapd->iconf->beacon_int);
 693
 694         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 695         capab_info = hostapd_own_capab_info(hapd, NULL, 0);
 696         head->u.beacon.capab_info = host_to_le16(capab_info);
 697         pos = &head->u.beacon.variable[0];
 698
 699         /* SSID */
 700         *pos++ = WLAN_EID_SSID;
 701         if (hapd->conf->ignore_broadcast_ssid == 2) {
 702                 /* clear the data, but keep the correct length of the SSID */
 703                 *pos++ = hapd->conf->ssid.ssid_len;
 704                 os_memset(pos, 0, hapd->conf->ssid.ssid_len);
 705                 pos += hapd->conf->ssid.ssid_len;
 706         } else if (hapd->conf->ignore_broadcast_ssid) {
 707                 *pos++ = 0; /* empty SSID */
 708         } else {
 709                 *pos++ = hapd->conf->ssid.ssid_len;
 710                 os_memcpy(pos, hapd->conf->ssid.ssid,
 711                           hapd->conf->ssid.ssid_len);
 712                 pos += hapd->conf->ssid.ssid_len;
 713         }
 714
 715         /* Supported rates */
 716         pos = hostapd_eid_supp_rates(hapd, pos);
 717
 718         /* DS Params */
 719         pos = hostapd_eid_ds_params(hapd, pos);
 720
 721         head_len = pos - (u8 *) head;
 722
 723         tailpos = hostapd_eid_country(hapd, tailpos,
 724                                       tail + BEACON_TAIL_BUF_SIZE - tailpos);
 725
 726         /* ERP Information element */
 727         tailpos = hostapd_eid_erp_info(hapd, tailpos);
 728
 729         /* Extended supported rates */
 730         tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
 731
 732         /* RSN, MDIE, WPA */
 733         tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
 734                                   tailpos);
 735
 736         tailpos = hostapd_eid_bss_load(hapd, tailpos,
 737                                        tail + BEACON_TAIL_BUF_SIZE - tailpos);
 738
 739 #ifdef CONFIG_IEEE80211N
 740         tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
 741         tailpos = hostapd_eid_ht_operation(hapd, tailpos);
 742 #endif /* CONFIG_IEEE80211N */
 743
 744         tailpos = hostapd_eid_ext_capab(hapd, tailpos);
 745
 746         /*
 747          * TODO: Time Advertisement element should only be included in some
 748          * DTIM Beacon frames.
 749          */
 750         tailpos = hostapd_eid_time_adv(hapd, tailpos);
 751
 752         tailpos = hostapd_eid_interworking(hapd, tailpos);
 753         tailpos = hostapd_eid_adv_proto(hapd, tailpos);
 754         tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
 755         tailpos = hostapd_add_csa_elems(hapd, tailpos, tail,
 756                                         &hapd->iface->cs_c_off_beacon);
 757 #ifdef CONFIG_IEEE80211AC
 758         tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
 759         tailpos = hostapd_eid_vht_operation(hapd, tailpos);
 760 #endif /* CONFIG_IEEE80211AC */
 761
 762         /* Wi-Fi Alliance WMM */
 763         tailpos = hostapd_eid_wmm(hapd, tailpos);
 764
 765 #ifdef CONFIG_WPS
 766         if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
 767                 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
 768                           wpabuf_len(hapd->wps_beacon_ie));
 769                 tailpos += wpabuf_len(hapd->wps_beacon_ie);
 770         }
 771 #endif /* CONFIG_WPS */
 772
 773 #ifdef CONFIG_P2P
 774         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
 775                 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
 776                           wpabuf_len(hapd->p2p_beacon_ie));
 777                 tailpos += wpabuf_len(hapd->p2p_beacon_ie);
 778         }
 779 #endif /* CONFIG_P2P */
 780 #ifdef CONFIG_P2P_MANAGER
 781         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 782             P2P_MANAGE)
 783                 tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
 784 #endif /* CONFIG_P2P_MANAGER */
 785
 786 #ifdef CONFIG_HS20
 787         tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
 788 #endif /* CONFIG_HS20 */
 789
 790         if (hapd->conf->vendor_elements) {
 791                 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
 792                           wpabuf_len(hapd->conf->vendor_elements));
 793                 tailpos += wpabuf_len(hapd->conf->vendor_elements);
 794         }
 795
 796         tail_len = tailpos > tail ? tailpos - tail : 0;
 797
 798         resp = hostapd_probe_resp_offloads(hapd, &resp_len);
 799 #endif /* NEED_AP_MLME */
 800
 801         os_memset(params, 0, sizeof(*params));
 802         params->head = (u8 *) head;
 803         params->head_len = head_len;
 804         params->tail = tail;
 805         params->tail_len = tail_len;
 806         params->proberesp = resp;
 807         params->proberesp_len = resp_len;
 808         params->dtim_period = hapd->conf->dtim_period;
 809         params->beacon_int = hapd->iconf->beacon_int;
 810         params->basic_rates = hapd->iface->basic_rates;
 811         params->ssid = hapd->conf->ssid.ssid;
 812         params->ssid_len = hapd->conf->ssid.ssid_len;
 813         params->pairwise_ciphers = hapd->conf->rsn_pairwise ?
 814                 hapd->conf->rsn_pairwise : hapd->conf->wpa_pairwise;
 815         params->group_cipher = hapd->conf->wpa_group;
 816         params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
 817         params->auth_algs = hapd->conf->auth_algs;
 818         params->wpa_version = hapd->conf->wpa;
 819         params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
 820                 (hapd->conf->ieee802_1x &&
 821                  (hapd->conf->default_wep_key_len ||
 822                   hapd->conf->individual_wep_key_len));
 823         switch (hapd->conf->ignore_broadcast_ssid) {
 824         case 0:
 825                 params->hide_ssid = NO_SSID_HIDING;
 826                 break;
 827         case 1:
 828                 params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
 829                 break;
 830         case 2:
 831                 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
 832                 break;
 833         }
 834         params->isolate = hapd->conf->isolate;
 835 #ifdef NEED_AP_MLME
 836         params->cts_protect = !!(ieee802_11_erp_info(hapd) &
 837                                 ERP_INFO_USE_PROTECTION);
 838         params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
 839                 hapd->iconf->preamble == SHORT_PREAMBLE;
 840         if (hapd->iface->current_mode &&
 841             hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
 842                 params->short_slot_time =
 843                         hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
 844         else
 845                 params->short_slot_time = -1;
 846         if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
 847                 params->ht_opmode = -1;
 848         else
 849                 params->ht_opmode = hapd->iface->ht_op_mode;
 850 #endif /* NEED_AP_MLME */
 851         params->interworking = hapd->conf->interworking;
 852         if (hapd->conf->interworking &&
 853             !is_zero_ether_addr(hapd->conf->hessid))
 854                 params->hessid = hapd->conf->hessid;
 855         params->access_network_type = hapd->conf->access_network_type;
 856         params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
 857 #ifdef CONFIG_HS20
 858         params->disable_dgaf = hapd->conf->disable_dgaf;
 859 #endif /* CONFIG_HS20 */
 860         return 0;
 861 }
 862
 863
 864 void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
 865 {
 866         os_free(params->tail);
 867         params->tail = NULL;
 868         os_free(params->head);
 869         params->head = NULL;
 870         os_free(params->proberesp);
 871         params->proberesp = NULL;
 872 }
 873
 874
 875 int ieee802_11_set_beacon(struct hostapd_data *hapd)
 876 {
 877         struct wpa_driver_ap_params params;
 878         struct wpabuf *beacon, *proberesp, *assocresp;
 879         int res, ret = -1;
 880
 881         if (hapd->iface->csa_in_progress) {
 882                 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
 883                 return -1;
 884         }
 885
 886         hapd->beacon_set_done = 1;
 887
 888         if (ieee802_11_build_ap_params(hapd, &params) < 0)
 889                 return -1;
 890
 891         if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
 892             0)
 893                 goto fail;
 894
 895         params.beacon_ies = beacon;
 896         params.proberesp_ies = proberesp;
 897         params.assocresp_ies = assocresp;
 898
 899         res = hostapd_drv_set_ap(hapd, &params);
 900         hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
 901         if (res)
 902                 wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
 903         else
 904                 ret = 0;
 905 fail:
 906         ieee802_11_free_ap_params(&params);
 907         return ret;
 908 }
 909
 910
 911 int ieee802_11_set_beacons(struct hostapd_iface *iface)
 912 {
 913         size_t i;
 914         int ret = 0;
 915
 916         for (i = 0; i < iface->num_bss; i++) {
 917                 if (iface->bss[i]->started &&
 918                     ieee802_11_set_beacon(iface->bss[i]) < 0)
 919                         ret = -1;
 920         }
 921
 922         return ret;
 923 }
 924
 925
 926 /* only update beacons if started */
 927 int ieee802_11_update_beacons(struct hostapd_iface *iface)
 928 {
 929         size_t i;
 930         int ret = 0;
 931
 932         for (i = 0; i < iface->num_bss; i++) {
 933                 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started &&
 934                     ieee802_11_set_beacon(iface->bss[i]) < 0)
 935                         ret = -1;
 936         }
 937
 938         return ret;
 939 }
 940
 941 #endif /* CONFIG_NATIVE_WINDOWS */