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 program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * Alternatively, this software may be distributed under the terms of BSD
  12  * license.
  13  *
  14  * See README and COPYING for more details.
  15  */
  16
  17 #include "utils/includes.h"
  18
  19 #ifndef CONFIG_NATIVE_WINDOWS
  20
  21 #include "utils/common.h"
  22 #include "common/ieee802_11_defs.h"
  23 #include "common/ieee802_11_common.h"
  24 #include "wps/wps_defs.h"
  25 #include "p2p/p2p.h"
  26 #include "hostapd.h"
  27 #include "ieee802_11.h"
  28 #include "wpa_auth.h"
  29 #include "wmm.h"
  30 #include "ap_config.h"
  31 #include "sta_info.h"
  32 #include "p2p_hostapd.h"
  33 #include "ap_drv_ops.h"
  34 #include "beacon.h"
  35 #include "hs20.h"
  36
  37
  38 #ifdef NEED_AP_MLME
  39
  40 static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len)
  41 {
  42 #ifdef CONFIG_TESTING_OPTIONS
  43         if (hapd->conf->bss_load_test_set) {
  44                 if (2 + 5 > len)
  45                         return eid;
  46                 *eid++ = WLAN_EID_BSS_LOAD;
  47                 *eid++ = 5;
  48                 os_memcpy(eid, hapd->conf->bss_load_test, 5);
  49                 eid += 5;
  50         }
  51 #endif /* CONFIG_TESTING_OPTIONS */
  52         return eid;
  53 }
  54
  55
  56 static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
  57 {
  58         u8 erp = 0;
  59
  60         if (hapd->iface->current_mode == NULL ||
  61             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  62                 return 0;
  63
  64         if (hapd->iface->olbc)
  65                 erp |= ERP_INFO_USE_PROTECTION;
  66         if (hapd->iface->num_sta_non_erp > 0) {
  67                 erp |= ERP_INFO_NON_ERP_PRESENT |
  68                         ERP_INFO_USE_PROTECTION;
  69         }
  70         if (hapd->iface->num_sta_no_short_preamble > 0 ||
  71             hapd->iconf->preamble == LONG_PREAMBLE)
  72                 erp |= ERP_INFO_BARKER_PREAMBLE_MODE;
  73
  74         return erp;
  75 }
  76
  77
  78 static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid)
  79 {
  80         *eid++ = WLAN_EID_DS_PARAMS;
  81         *eid++ = 1;
  82         *eid++ = hapd->iconf->channel;
  83         return eid;
  84 }
  85
  86
  87 static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
  88 {
  89         if (hapd->iface->current_mode == NULL ||
  90             hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
  91                 return eid;
  92
  93         /* Set NonERP_present and use_protection bits if there
  94          * are any associated NonERP stations. */
  95         /* TODO: use_protection bit can be set to zero even if
  96          * there are NonERP stations present. This optimization
  97          * might be useful if NonERP stations are "quiet".
  98          * See 802.11g/D6 E-1 for recommended practice.
  99          * In addition, Non ERP present might be set, if AP detects Non ERP
 100          * operation on other APs. */
 101
 102         /* Add ERP Information element */
 103         *eid++ = WLAN_EID_ERP_INFO;
 104         *eid++ = 1;
 105         *eid++ = ieee802_11_erp_info(hapd);
 106
 107         return eid;
 108 }
 109
 110
 111 static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing,
 112                                     struct hostapd_channel_data *start,
 113                                     struct hostapd_channel_data *prev)
 114 {
 115         if (end - pos < 3)
 116                 return pos;
 117
 118         /* first channel number */
 119         *pos++ = start->chan;
 120         /* number of channels */
 121         *pos++ = (prev->chan - start->chan) / chan_spacing + 1;
 122         /* maximum transmit power level */
 123         *pos++ = start->max_tx_power;
 124
 125         return pos;
 126 }
 127
 128
 129 static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
 130                                 int max_len)
 131 {
 132         u8 *pos = eid;
 133         u8 *end = eid + max_len;
 134         int i;
 135         struct hostapd_hw_modes *mode;
 136         struct hostapd_channel_data *start, *prev;
 137         int chan_spacing = 1;
 138
 139         if (!hapd->iconf->ieee80211d || max_len < 6 ||
 140             hapd->iface->current_mode == NULL)
 141                 return eid;
 142
 143         *pos++ = WLAN_EID_COUNTRY;
 144         pos++; /* length will be set later */
 145         os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
 146         pos += 3;
 147
 148         mode = hapd->iface->current_mode;
 149         if (mode->mode == HOSTAPD_MODE_IEEE80211A)
 150                 chan_spacing = 4;
 151
 152         start = prev = NULL;
 153         for (i = 0; i < mode->num_channels; i++) {
 154                 struct hostapd_channel_data *chan = &mode->channels[i];
 155                 if (chan->flag & HOSTAPD_CHAN_DISABLED)
 156                         continue;
 157                 if (start && prev &&
 158                     prev->chan + chan_spacing == chan->chan &&
 159                     start->max_tx_power == chan->max_tx_power) {
 160                         prev = chan;
 161                         continue; /* can use same entry */
 162                 }
 163
 164                 if (start) {
 165                         pos = hostapd_eid_country_add(pos, end, chan_spacing,
 166                                                       start, prev);
 167                         start = NULL;
 168                 }
 169
 170                 /* Start new group */
 171                 start = prev = chan;
 172         }
 173
 174         if (start) {
 175                 pos = hostapd_eid_country_add(pos, end, chan_spacing,
 176                                               start, prev);
 177         }
 178
 179         if ((pos - eid) & 1) {
 180                 if (end - pos < 1)
 181                         return eid;
 182                 *pos++ = 0; /* pad for 16-bit alignment */
 183         }
 184
 185         eid[1] = (pos - eid) - 2;
 186
 187         return pos;
 188 }
 189
 190
 191 static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len)
 192 {
 193         const u8 *ie;
 194         size_t ielen;
 195
 196         ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
 197         if (ie == NULL || ielen > len)
 198                 return eid;
 199
 200         os_memcpy(eid, ie, ielen);
 201         return eid + ielen;
 202 }
 203
 204
 205 static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid)
 206 {
 207         u8 chan;
 208
 209         if (!hapd->iface->cs_freq_params.freq)
 210                 return eid;
 211
 212         if (ieee80211_freq_to_chan(hapd->iface->cs_freq_params.freq, &chan) ==
 213             NUM_HOSTAPD_MODES)
 214                 return eid;
 215
 216         *eid++ = WLAN_EID_CHANNEL_SWITCH;
 217         *eid++ = 3;
 218         *eid++ = hapd->iface->cs_block_tx;
 219         *eid++ = chan;
 220         *eid++ = hapd->iface->cs_count;
 221
 222         return eid;
 223 }
 224
 225
 226 static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid)
 227 {
 228         u8 sec_ch;
 229
 230         if (!hapd->iface->cs_freq_params.sec_channel_offset)
 231                 return eid;
 232
 233         if (hapd->iface->cs_freq_params.sec_channel_offset == -1)
 234                 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW;
 235         else if (hapd->iface->cs_freq_params.sec_channel_offset == 1)
 236                 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE;
 237         else
 238                 return eid;
 239
 240         *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
 241         *eid++ = 1;
 242         *eid++ = sec_ch;
 243
 244         return eid;
 245 }
 246
 247
 248 static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos,
 249                                   u8 *start, unsigned int *csa_counter_off)
 250 {
 251         u8 *old_pos = pos;
 252
 253         if (!csa_counter_off)
 254                 return pos;
 255
 256         *csa_counter_off = 0;
 257         pos = hostapd_eid_csa(hapd, pos);
 258
 259         if (pos != old_pos) {
 260                 /* save an offset to the counter - should be last byte */
 261                 *csa_counter_off = pos - start - 1;
 262                 pos = hostapd_eid_secondary_channel(hapd, pos);
 263         }
 264
 265         return pos;
 266 }
 267
 268
 269 static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 270                                    struct sta_info *sta,
 271                                    const struct ieee80211_mgmt *req,
 272                                    int is_p2p, size_t *resp_len)
 273 {
 274         struct ieee80211_mgmt *resp;
 275         u8 *pos, *epos;
 276         size_t buflen;
 277
 278 #define MAX_PROBERESP_LEN 768
 279         buflen = MAX_PROBERESP_LEN;
 280 #ifdef CONFIG_WPS
 281         if (hapd->wps_probe_resp_ie)
 282                 buflen += wpabuf_len(hapd->wps_probe_resp_ie);
 283 #endif /* CONFIG_WPS */
 284 #ifdef CONFIG_P2P
 285         if (hapd->p2p_probe_resp_ie)
 286                 buflen += wpabuf_len(hapd->p2p_probe_resp_ie);
 287 #endif /* CONFIG_P2P */
 288         if (hapd->conf->vendor_elements)
 289                 buflen += wpabuf_len(hapd->conf->vendor_elements);
 290         resp = os_zalloc(buflen);
 291         if (resp == NULL)
 292                 return NULL;
 293
 294         epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
 295
 296         resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 297                                            WLAN_FC_STYPE_PROBE_RESP);
 298         if (req)
 299                 os_memcpy(resp->da, req->sa, ETH_ALEN);
 300         os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
 301
 302         os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
 303         resp->u.probe_resp.beacon_int =
 304                 host_to_le16(hapd->iconf->beacon_int);
 305
 306         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 307         resp->u.probe_resp.capab_info =
 308                 host_to_le16(hostapd_own_capab_info(hapd, sta, 1));
 309
 310         pos = resp->u.probe_resp.variable;
 311         *pos++ = WLAN_EID_SSID;
 312         *pos++ = hapd->conf->ssid.ssid_len;
 313         os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len);
 314         pos += hapd->conf->ssid.ssid_len;
 315
 316         /* Supported rates */
 317         pos = hostapd_eid_supp_rates(hapd, pos);
 318
 319         /* DS Params */
 320         pos = hostapd_eid_ds_params(hapd, pos);
 321
 322         pos = hostapd_eid_country(hapd, pos, epos - pos);
 323
 324         /* ERP Information element */
 325         pos = hostapd_eid_erp_info(hapd, pos);
 326
 327         /* Extended supported rates */
 328         pos = hostapd_eid_ext_supp_rates(hapd, pos);
 329
 330         /* RSN, MDIE, WPA */
 331         pos = hostapd_eid_wpa(hapd, pos, epos - pos);
 332
 333         pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
 334
 335 #ifdef CONFIG_IEEE80211N
 336         pos = hostapd_eid_ht_capabilities(hapd, pos);
 337         pos = hostapd_eid_ht_operation(hapd, pos);
 338 #endif /* CONFIG_IEEE80211N */
 339
 340         pos = hostapd_eid_ext_capab(hapd, pos);
 341
 342         pos = hostapd_eid_time_adv(hapd, pos);
 343         pos = hostapd_eid_time_zone(hapd, pos);
 344
 345         pos = hostapd_eid_interworking(hapd, pos);
 346         pos = hostapd_eid_adv_proto(hapd, pos);
 347         pos = hostapd_eid_roaming_consortium(hapd, pos);
 348
 349         pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp,
 350                                     &hapd->iface->cs_c_off_proberesp);
 351 #ifdef CONFIG_IEEE80211AC
 352         pos = hostapd_eid_vht_capabilities(hapd, pos);
 353         pos = hostapd_eid_vht_operation(hapd, pos);
 354 #endif /* CONFIG_IEEE80211AC */
 355
 356         /* Wi-Fi Alliance WMM */
 357         pos = hostapd_eid_wmm(hapd, pos);
 358
 359 #ifdef CONFIG_WPS
 360         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
 361                 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
 362                           wpabuf_len(hapd->wps_probe_resp_ie));
 363                 pos += wpabuf_len(hapd->wps_probe_resp_ie);
 364         }
 365 #endif /* CONFIG_WPS */
 366
 367 #ifdef CONFIG_P2P
 368         if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
 369             hapd->p2p_probe_resp_ie) {
 370                 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
 371                           wpabuf_len(hapd->p2p_probe_resp_ie));
 372                 pos += wpabuf_len(hapd->p2p_probe_resp_ie);
 373         }
 374 #endif /* CONFIG_P2P */
 375 #ifdef CONFIG_P2P_MANAGER
 376         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 377             P2P_MANAGE)
 378                 pos = hostapd_eid_p2p_manage(hapd, pos);
 379 #endif /* CONFIG_P2P_MANAGER */
 380
 381 #ifdef CONFIG_HS20
 382         pos = hostapd_eid_hs20_indication(hapd, pos);
 383 #endif /* CONFIG_HS20 */
 384
 385         if (hapd->conf->vendor_elements) {
 386                 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
 387                           wpabuf_len(hapd->conf->vendor_elements));
 388                 pos += wpabuf_len(hapd->conf->vendor_elements);
 389         }
 390
 391         *resp_len = pos - (u8 *) resp;
 392         return (u8 *) resp;
 393 }
 394
 395
 396 enum ssid_match_result {
 397         NO_SSID_MATCH,
 398         EXACT_SSID_MATCH,
 399         WILDCARD_SSID_MATCH
 400 };
 401
 402 static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
 403                                          const u8 *ssid, size_t ssid_len,
 404                                          const u8 *ssid_list,
 405                                          size_t ssid_list_len)
 406 {
 407         const u8 *pos, *end;
 408         int wildcard = 0;
 409
 410         if (ssid_len == 0)
 411                 wildcard = 1;
 412         if (ssid_len == hapd->conf->ssid.ssid_len &&
 413             os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
 414                 return EXACT_SSID_MATCH;
 415
 416         if (ssid_list == NULL)
 417                 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 418
 419         pos = ssid_list;
 420         end = ssid_list + ssid_list_len;
 421         while (pos + 1 <= end) {
 422                 if (pos + 2 + pos[1] > end)
 423                         break;
 424                 if (pos[1] == 0)
 425                         wildcard = 1;
 426                 if (pos[1] == hapd->conf->ssid.ssid_len &&
 427                     os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
 428                         return EXACT_SSID_MATCH;
 429                 pos += 2 + pos[1];
 430         }
 431
 432         return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
 433 }
 434
 435
 436 void handle_probe_req(struct hostapd_data *hapd,
 437                       const struct ieee80211_mgmt *mgmt, size_t len,
 438                       int ssi_signal)
 439 {
 440         u8 *resp;
 441         struct ieee802_11_elems elems;
 442         const u8 *ie;
 443         size_t ie_len;
 444         struct sta_info *sta = NULL;
 445         size_t i, resp_len;
 446         int noack;
 447         enum ssid_match_result res;
 448
 449         ie = mgmt->u.probe_req.variable;
 450         if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
 451                 return;
 452         ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
 453
 454         for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
 455                 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
 456                                             mgmt->sa, mgmt->da, mgmt->bssid,
 457                                             ie, ie_len, ssi_signal) > 0)
 458                         return;
 459
 460         if (!hapd->iconf->send_probe_response)
 461                 return;
 462
 463         if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
 464                 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
 465                            MAC2STR(mgmt->sa));
 466                 return;
 467         }
 468
 469         if ((!elems.ssid || !elems.supp_rates)) {
 470                 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
 471                            "without SSID or supported rates element",
 472                            MAC2STR(mgmt->sa));
 473                 return;
 474         }
 475
 476 #ifdef CONFIG_P2P
 477         if (hapd->p2p && elems.wps_ie) {
 478                 struct wpabuf *wps;
 479                 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
 480                 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
 481                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 482                                    "due to mismatch with Requested Device "
 483                                    "Type");
 484                         wpabuf_free(wps);
 485                         return;
 486                 }
 487                 wpabuf_free(wps);
 488         }
 489
 490         if (hapd->p2p && elems.p2p) {
 491                 struct wpabuf *p2p;
 492                 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
 493                 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
 494                         wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
 495                                    "due to mismatch with Device ID");
 496                         wpabuf_free(p2p);
 497                         return;
 498                 }
 499                 wpabuf_free(p2p);
 500         }
 501 #endif /* CONFIG_P2P */
 502
 503         if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
 504             elems.ssid_list_len == 0) {
 505                 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
 506                            "broadcast SSID ignored", MAC2STR(mgmt->sa));
 507                 return;
 508         }
 509
 510         sta = ap_get_sta(hapd, mgmt->sa);
 511
 512 #ifdef CONFIG_P2P
 513         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 514             elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
 515             os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
 516                       P2P_WILDCARD_SSID_LEN) == 0) {
 517                 /* Process P2P Wildcard SSID like Wildcard SSID */
 518                 elems.ssid_len = 0;
 519         }
 520 #endif /* CONFIG_P2P */
 521
 522         res = ssid_match(hapd, elems.ssid, elems.ssid_len,
 523                          elems.ssid_list, elems.ssid_list_len);
 524         if (res != NO_SSID_MATCH) {
 525                 if (sta)
 526                         sta->ssid_probe = &hapd->conf->ssid;
 527         } else {
 528                 if (!(mgmt->da[0] & 0x01)) {
 529                         char ssid_txt[33];
 530                         ieee802_11_print_ssid(ssid_txt, elems.ssid,
 531                                               elems.ssid_len);
 532                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 533                                    " for foreign SSID '%s' (DA " MACSTR ")%s",
 534                                    MAC2STR(mgmt->sa), ssid_txt,
 535                                    MAC2STR(mgmt->da),
 536                                    elems.ssid_list ? " (SSID list)" : "");
 537                 }
 538                 return;
 539         }
 540
 541 #ifdef CONFIG_INTERWORKING
 542         if (elems.interworking && elems.interworking_len >= 1) {
 543                 u8 ant = elems.interworking[0] & 0x0f;
 544                 if (ant != INTERWORKING_ANT_WILDCARD &&
 545                     ant != hapd->conf->access_network_type) {
 546                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 547                                    " for mismatching ANT %u ignored",
 548                                    MAC2STR(mgmt->sa), ant);
 549                         return;
 550                 }
 551         }
 552
 553         if (elems.interworking &&
 554             (elems.interworking_len == 7 || elems.interworking_len == 9)) {
 555                 const u8 *hessid;
 556                 if (elems.interworking_len == 7)
 557                         hessid = elems.interworking + 1;
 558                 else
 559                         hessid = elems.interworking + 1 + 2;
 560                 if (!is_broadcast_ether_addr(hessid) &&
 561                     os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
 562                         wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
 563                                    " for mismatching HESSID " MACSTR
 564                                    " ignored",
 565                                    MAC2STR(mgmt->sa), MAC2STR(hessid));
 566                         return;
 567                 }
 568         }
 569 #endif /* CONFIG_INTERWORKING */
 570
 571 #ifdef CONFIG_P2P
 572         if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
 573             supp_rates_11b_only(&elems)) {
 574                 /* Indicates support for 11b rates only */
 575                 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
 576                            MACSTR " with only 802.11b rates",
 577                            MAC2STR(mgmt->sa));
 578                 return;
 579         }
 580 #endif /* CONFIG_P2P */
 581
 582         /* TODO: verify that supp_rates contains at least one matching rate
 583          * with AP configuration */
 584
 585 #ifdef CONFIG_TESTING_OPTIONS
 586         if (hapd->iconf->ignore_probe_probability > 0.0d &&
 587             drand48() < hapd->iconf->ignore_probe_probability) {
 588                 wpa_printf(MSG_INFO,
 589                            "TESTING: ignoring probe request from " MACSTR,
 590                            MAC2STR(mgmt->sa));
 591                 return;
 592         }
 593 #endif /* CONFIG_TESTING_OPTIONS */
 594
 595         resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL,
 596                                       &resp_len);
 597         if (resp == NULL)
 598                 return;
 599
 600         /*
 601          * If this is a broadcast probe request, apply no ack policy to avoid
 602          * excessive retries.
 603          */
 604         noack = !!(res == WILDCARD_SSID_MATCH &&
 605                    is_broadcast_ether_addr(mgmt->da));
 606
 607         if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
 608                 wpa_printf(MSG_INFO, "handle_probe_req: send failed");
 609
 610         os_free(resp);
 611
 612         wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
 613                    "SSID", MAC2STR(mgmt->sa),
 614                    elems.ssid_len == 0 ? "broadcast" : "our");
 615 }
 616
 617
 618 static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
 619                                         size_t *resp_len)
 620 {
 621         /* check probe response offloading caps and print warnings */
 622         if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
 623                 return NULL;
 624
 625 #ifdef CONFIG_WPS
 626         if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
 627             (!(hapd->iface->probe_resp_offloads &
 628                (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
 629                 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
 630                 wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
 631                            "Probe Response while not supporting this");
 632 #endif /* CONFIG_WPS */
 633
 634 #ifdef CONFIG_P2P
 635         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
 636             !(hapd->iface->probe_resp_offloads &
 637               WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
 638                 wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
 639                            "Probe Response while not supporting this");
 640 #endif  /* CONFIG_P2P */
 641
 642         if (hapd->conf->interworking &&
 643             !(hapd->iface->probe_resp_offloads &
 644               WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
 645                 wpa_printf(MSG_WARNING, "Device is trying to offload "
 646                            "Interworking Probe Response while not supporting "
 647                            "this");
 648
 649         /* Generate a Probe Response template for the non-P2P case */
 650         return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len);
 651 }
 652
 653 #endif /* NEED_AP_MLME */
 654
 655
 656 int ieee802_11_build_ap_params(struct hostapd_data *hapd,
 657                                struct wpa_driver_ap_params *params)
 658 {
 659         struct ieee80211_mgmt *head = NULL;
 660         u8 *tail = NULL;
 661         size_t head_len = 0, tail_len = 0;
 662         u8 *resp = NULL;
 663         size_t resp_len = 0;
 664 #ifdef NEED_AP_MLME
 665         u16 capab_info;
 666         u8 *pos, *tailpos;
 667
 668 #define BEACON_HEAD_BUF_SIZE 256
 669 #define BEACON_TAIL_BUF_SIZE 512
 670         head = os_zalloc(BEACON_HEAD_BUF_SIZE);
 671         tail_len = BEACON_TAIL_BUF_SIZE;
 672 #ifdef CONFIG_WPS
 673         if (hapd->conf->wps_state && hapd->wps_beacon_ie)
 674                 tail_len += wpabuf_len(hapd->wps_beacon_ie);
 675 #endif /* CONFIG_WPS */
 676 #ifdef CONFIG_P2P
 677         if (hapd->p2p_beacon_ie)
 678                 tail_len += wpabuf_len(hapd->p2p_beacon_ie);
 679 #endif /* CONFIG_P2P */
 680         if (hapd->conf->vendor_elements)
 681                 tail_len += wpabuf_len(hapd->conf->vendor_elements);
 682         tailpos = tail = os_malloc(tail_len);
 683         if (head == NULL || tail == NULL) {
 684                 wpa_printf(MSG_ERROR, "Failed to set beacon data");
 685                 os_free(head);
 686                 os_free(tail);
 687                 return -1;
 688         }
 689
 690         head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 691                                            WLAN_FC_STYPE_BEACON);
 692         head->duration = host_to_le16(0);
 693         os_memset(head->da, 0xff, ETH_ALEN);
 694
 695         os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
 696         os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
 697         head->u.beacon.beacon_int =
 698                 host_to_le16(hapd->iconf->beacon_int);
 699
 700         /* hardware or low-level driver will setup seq_ctrl and timestamp */
 701         capab_info = hostapd_own_capab_info(hapd, NULL, 0);
 702         head->u.beacon.capab_info = host_to_le16(capab_info);
 703         pos = &head->u.beacon.variable[0];
 704
 705         /* SSID */
 706         *pos++ = WLAN_EID_SSID;
 707         if (hapd->conf->ignore_broadcast_ssid == 2) {
 708                 /* clear the data, but keep the correct length of the SSID */
 709                 *pos++ = hapd->conf->ssid.ssid_len;
 710                 os_memset(pos, 0, hapd->conf->ssid.ssid_len);
 711                 pos += hapd->conf->ssid.ssid_len;
 712         } else if (hapd->conf->ignore_broadcast_ssid) {
 713                 *pos++ = 0; /* empty SSID */
 714         } else {
 715                 *pos++ = hapd->conf->ssid.ssid_len;
 716                 os_memcpy(pos, hapd->conf->ssid.ssid,
 717                           hapd->conf->ssid.ssid_len);
 718                 pos += hapd->conf->ssid.ssid_len;
 719         }
 720
 721         /* Supported rates */
 722         pos = hostapd_eid_supp_rates(hapd, pos);
 723
 724         /* DS Params */
 725         pos = hostapd_eid_ds_params(hapd, pos);
 726
 727         head_len = pos - (u8 *) head;
 728
 729         tailpos = hostapd_eid_country(hapd, tailpos,
 730                                       tail + BEACON_TAIL_BUF_SIZE - tailpos);
 731
 732         /* ERP Information element */
 733         tailpos = hostapd_eid_erp_info(hapd, tailpos);
 734
 735         /* Extended supported rates */
 736         tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
 737
 738         /* RSN, MDIE, WPA */
 739         tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
 740                                   tailpos);
 741
 742         tailpos = hostapd_eid_bss_load(hapd, tailpos,
 743                                        tail + BEACON_TAIL_BUF_SIZE - tailpos);
 744
 745 #ifdef CONFIG_IEEE80211N
 746         tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
 747         tailpos = hostapd_eid_ht_operation(hapd, tailpos);
 748 #endif /* CONFIG_IEEE80211N */
 749
 750         tailpos = hostapd_eid_ext_capab(hapd, tailpos);
 751
 752         /*
 753          * TODO: Time Advertisement element should only be included in some
 754          * DTIM Beacon frames.
 755          */
 756         tailpos = hostapd_eid_time_adv(hapd, tailpos);
 757
 758         tailpos = hostapd_eid_interworking(hapd, tailpos);
 759         tailpos = hostapd_eid_adv_proto(hapd, tailpos);
 760         tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
 761         tailpos = hostapd_add_csa_elems(hapd, tailpos, tail,
 762                                         &hapd->iface->cs_c_off_beacon);
 763 #ifdef CONFIG_IEEE80211AC
 764         tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
 765         tailpos = hostapd_eid_vht_operation(hapd, tailpos);
 766 #endif /* CONFIG_IEEE80211AC */
 767
 768         /* Wi-Fi Alliance WMM */
 769         tailpos = hostapd_eid_wmm(hapd, tailpos);
 770
 771 #ifdef CONFIG_WPS
 772         if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
 773                 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
 774                           wpabuf_len(hapd->wps_beacon_ie));
 775                 tailpos += wpabuf_len(hapd->wps_beacon_ie);
 776         }
 777 #endif /* CONFIG_WPS */
 778
 779 #ifdef CONFIG_P2P
 780         if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
 781                 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
 782                           wpabuf_len(hapd->p2p_beacon_ie));
 783                 tailpos += wpabuf_len(hapd->p2p_beacon_ie);
 784         }
 785 #endif /* CONFIG_P2P */
 786 #ifdef CONFIG_P2P_MANAGER
 787         if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
 788             P2P_MANAGE)
 789                 tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
 790 #endif /* CONFIG_P2P_MANAGER */
 791
 792 #ifdef CONFIG_HS20
 793         tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
 794 #endif /* CONFIG_HS20 */
 795
 796         if (hapd->conf->vendor_elements) {
 797                 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
 798                           wpabuf_len(hapd->conf->vendor_elements));
 799                 tailpos += wpabuf_len(hapd->conf->vendor_elements);
 800         }
 801
 802         tail_len = tailpos > tail ? tailpos - tail : 0;
 803
 804         resp = hostapd_probe_resp_offloads(hapd, &resp_len);
 805 #endif /* NEED_AP_MLME */
 806
 807         os_memset(params, 0, sizeof(*params));
 808         params->head = (u8 *) head;
 809         params->head_len = head_len;
 810         params->tail = tail;
 811         params->tail_len = tail_len;
 812         params->proberesp = resp;
 813         params->proberesp_len = resp_len;
 814         params->dtim_period = hapd->conf->dtim_period;
 815         params->beacon_int = hapd->iconf->beacon_int;
 816         params->basic_rates = hapd->iface->basic_rates;
 817         params->ssid = hapd->conf->ssid.ssid;
 818         params->ssid_len = hapd->conf->ssid.ssid_len;
 819         params->pairwise_ciphers = hapd->conf->rsn_pairwise ?
 820                 hapd->conf->rsn_pairwise : hapd->conf->wpa_pairwise;
 821         params->group_cipher = hapd->conf->wpa_group;
 822         params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
 823         params->auth_algs = hapd->conf->auth_algs;
 824         params->wpa_version = hapd->conf->wpa;
 825         params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
 826                 (hapd->conf->ieee802_1x &&
 827                  (hapd->conf->default_wep_key_len ||
 828                   hapd->conf->individual_wep_key_len));
 829         switch (hapd->conf->ignore_broadcast_ssid) {
 830         case 0:
 831                 params->hide_ssid = NO_SSID_HIDING;
 832                 break;
 833         case 1:
 834                 params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
 835                 break;
 836         case 2:
 837                 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
 838                 break;
 839         }
 840         params->isolate = hapd->conf->isolate;
 841 #ifdef NEED_AP_MLME
 842         params->cts_protect = !!(ieee802_11_erp_info(hapd) &
 843                                 ERP_INFO_USE_PROTECTION);
 844         params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
 845                 hapd->iconf->preamble == SHORT_PREAMBLE;
 846         if (hapd->iface->current_mode &&
 847             hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
 848                 params->short_slot_time =
 849                         hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
 850         else
 851                 params->short_slot_time = -1;
 852         if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
 853                 params->ht_opmode = -1;
 854         else
 855                 params->ht_opmode = hapd->iface->ht_op_mode;
 856 #endif /* NEED_AP_MLME */
 857         params->interworking = hapd->conf->interworking;
 858         if (hapd->conf->interworking &&
 859             !is_zero_ether_addr(hapd->conf->hessid))
 860                 params->hessid = hapd->conf->hessid;
 861         params->access_network_type = hapd->conf->access_network_type;
 862         params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
 863 #ifdef CONFIG_HS20
 864         params->disable_dgaf = hapd->conf->disable_dgaf;
 865 #endif /* CONFIG_HS20 */
 866         return 0;
 867 }
 868
 869
 870 void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
 871 {
 872         os_free(params->tail);
 873         params->tail = NULL;
 874         os_free(params->head);
 875         params->head = NULL;
 876         os_free(params->proberesp);
 877         params->proberesp = NULL;
 878 }
 879
 880
 881 int ieee802_11_set_beacon(struct hostapd_data *hapd)
 882 {
 883         struct wpa_driver_ap_params params;
 884         struct wpabuf *beacon, *proberesp, *assocresp;
 885         int res, ret = -1;
 886
 887         if (hapd->iface->csa_in_progress) {
 888                 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
 889                 return -1;
 890         }
 891
 892         hapd->beacon_set_done = 1;
 893
 894         if (ieee802_11_build_ap_params(hapd, &params) < 0)
 895                 return -1;
 896
 897         if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
 898             0)
 899                 goto fail;
 900
 901         params.beacon_ies = beacon;
 902         params.proberesp_ies = proberesp;
 903         params.assocresp_ies = assocresp;
 904
 905         res = hostapd_drv_set_ap(hapd, &params);
 906         hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
 907         if (res)
 908                 wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
 909         else
 910                 ret = 0;
 911 fail:
 912         ieee802_11_free_ap_params(&params);
 913         return ret;
 914 }
 915
 916
 917 int ieee802_11_set_beacons(struct hostapd_iface *iface)
 918 {
 919         size_t i;
 920         int ret = 0;
 921
 922         for (i = 0; i < iface->num_bss; i++) {
 923                 if (iface->bss[i]->started &&
 924                     ieee802_11_set_beacon(iface->bss[i]) < 0)
 925                         ret = -1;
 926         }
 927
 928         return ret;
 929 }
 930
 931
 932 /* only update beacons if started */
 933 int ieee802_11_update_beacons(struct hostapd_iface *iface)
 934 {
 935         size_t i;
 936         int ret = 0;
 937
 938         for (i = 0; i < iface->num_bss; i++) {
 939                 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started &&
 940                     ieee802_11_set_beacon(iface->bss[i]) < 0)
 941                         ret = -1;
 942         }
 943
 944         return ret;
 945 }
 946
 947 #endif /* CONFIG_NATIVE_WINDOWS */