| /* |
| * hostapd / IEEE 802.11 Management: Beacon and Probe Request/Response |
| * Copyright (c) 2002-2004, Instant802 Networks, Inc. |
| * Copyright (c) 2005-2006, Devicescape Software, Inc. |
| * Copyright (c) 2008-2009, Jouni Malinen <j@w1.fi> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * Alternatively, this software may be distributed under the terms of BSD |
| * license. |
| * |
| * See README and COPYING for more details. |
| */ |
| |
| #include "utils/includes.h" |
| |
| #ifndef CONFIG_NATIVE_WINDOWS |
| |
| #include "utils/common.h" |
| #include "common/ieee802_11_defs.h" |
| #include "common/ieee802_11_common.h" |
| #include "drivers/driver.h" |
| #include "wps/wps_defs.h" |
| #include "p2p/p2p.h" |
| #include "hostapd.h" |
| #include "ieee802_11.h" |
| #include "wpa_auth.h" |
| #include "wmm.h" |
| #include "ap_config.h" |
| #include "sta_info.h" |
| #include "p2p_hostapd.h" |
| #include "ap_drv_ops.h" |
| #include "beacon.h" |
| |
| |
| static u8 ieee802_11_erp_info(struct hostapd_data *hapd) |
| { |
| u8 erp = 0; |
| |
| if (hapd->iface->current_mode == NULL || |
| hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) |
| return 0; |
| |
| switch (hapd->iconf->cts_protection_type) { |
| case CTS_PROTECTION_FORCE_ENABLED: |
| erp |= ERP_INFO_NON_ERP_PRESENT | ERP_INFO_USE_PROTECTION; |
| break; |
| case CTS_PROTECTION_FORCE_DISABLED: |
| erp = 0; |
| break; |
| case CTS_PROTECTION_AUTOMATIC: |
| if (hapd->iface->olbc) |
| erp |= ERP_INFO_USE_PROTECTION; |
| /* continue */ |
| case CTS_PROTECTION_AUTOMATIC_NO_OLBC: |
| if (hapd->iface->num_sta_non_erp > 0) { |
| erp |= ERP_INFO_NON_ERP_PRESENT | |
| ERP_INFO_USE_PROTECTION; |
| } |
| break; |
| } |
| if (hapd->iface->num_sta_no_short_preamble > 0 || |
| hapd->iconf->preamble == LONG_PREAMBLE) |
| erp |= ERP_INFO_BARKER_PREAMBLE_MODE; |
| |
| return erp; |
| } |
| |
| |
| static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid) |
| { |
| *eid++ = WLAN_EID_DS_PARAMS; |
| *eid++ = 1; |
| *eid++ = hapd->iconf->channel; |
| return eid; |
| } |
| |
| |
| static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid) |
| { |
| if (hapd->iface->current_mode == NULL || |
| hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) |
| return eid; |
| |
| /* Set NonERP_present and use_protection bits if there |
| * are any associated NonERP stations. */ |
| /* TODO: use_protection bit can be set to zero even if |
| * there are NonERP stations present. This optimization |
| * might be useful if NonERP stations are "quiet". |
| * See 802.11g/D6 E-1 for recommended practice. |
| * In addition, Non ERP present might be set, if AP detects Non ERP |
| * operation on other APs. */ |
| |
| /* Add ERP Information element */ |
| *eid++ = WLAN_EID_ERP_INFO; |
| *eid++ = 1; |
| *eid++ = ieee802_11_erp_info(hapd); |
| |
| return eid; |
| } |
| |
| |
| static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing, |
| struct hostapd_channel_data *start, |
| struct hostapd_channel_data *prev) |
| { |
| if (end - pos < 3) |
| return pos; |
| |
| /* first channel number */ |
| *pos++ = start->chan; |
| /* number of channels */ |
| *pos++ = (prev->chan - start->chan) / chan_spacing + 1; |
| /* maximum transmit power level */ |
| *pos++ = start->max_tx_power; |
| |
| return pos; |
| } |
| |
| |
| static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid, |
| int max_len) |
| { |
| u8 *pos = eid; |
| u8 *end = eid + max_len; |
| int i; |
| struct hostapd_hw_modes *mode; |
| struct hostapd_channel_data *start, *prev; |
| int chan_spacing = 1; |
| |
| if (!hapd->iconf->ieee80211d || max_len < 6 || |
| hapd->iface->current_mode == NULL) |
| return eid; |
| |
| *pos++ = WLAN_EID_COUNTRY; |
| pos++; /* length will be set later */ |
| os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */ |
| pos += 3; |
| |
| mode = hapd->iface->current_mode; |
| if (mode->mode == HOSTAPD_MODE_IEEE80211A) |
| chan_spacing = 4; |
| |
| start = prev = NULL; |
| for (i = 0; i < mode->num_channels; i++) { |
| struct hostapd_channel_data *chan = &mode->channels[i]; |
| if (chan->flag & HOSTAPD_CHAN_DISABLED) |
| continue; |
| if (start && prev && |
| prev->chan + chan_spacing == chan->chan && |
| start->max_tx_power == chan->max_tx_power) { |
| prev = chan; |
| continue; /* can use same entry */ |
| } |
| |
| if (start) { |
| pos = hostapd_eid_country_add(pos, end, chan_spacing, |
| start, prev); |
| start = NULL; |
| } |
| |
| /* Start new group */ |
| start = prev = chan; |
| } |
| |
| if (start) { |
| pos = hostapd_eid_country_add(pos, end, chan_spacing, |
| start, prev); |
| } |
| |
| if ((pos - eid) & 1) { |
| if (end - pos < 1) |
| return eid; |
| *pos++ = 0; /* pad for 16-bit alignment */ |
| } |
| |
| eid[1] = (pos - eid) - 2; |
| |
| return pos; |
| } |
| |
| |
| static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len, |
| struct sta_info *sta) |
| { |
| const u8 *ie; |
| size_t ielen; |
| |
| ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen); |
| if (ie == NULL || ielen > len) |
| return eid; |
| |
| os_memcpy(eid, ie, ielen); |
| return eid + ielen; |
| } |
| |
| |
| void handle_probe_req(struct hostapd_data *hapd, |
| const struct ieee80211_mgmt *mgmt, size_t len) |
| { |
| struct ieee80211_mgmt *resp; |
| struct ieee802_11_elems elems; |
| char *ssid; |
| u8 *pos, *epos; |
| const u8 *ie; |
| size_t ssid_len, ie_len; |
| struct sta_info *sta = NULL; |
| size_t buflen; |
| size_t i; |
| |
| ie = mgmt->u.probe_req.variable; |
| if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req)) |
| return; |
| ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req)); |
| |
| for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++) |
| if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx, |
| mgmt->sa, ie, ie_len) > 0) |
| return; |
| |
| if (!hapd->iconf->send_probe_response) |
| return; |
| |
| if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) { |
| wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR, |
| MAC2STR(mgmt->sa)); |
| return; |
| } |
| |
| ssid = NULL; |
| ssid_len = 0; |
| |
| if ((!elems.ssid || !elems.supp_rates)) { |
| wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request " |
| "without SSID or supported rates element", |
| MAC2STR(mgmt->sa)); |
| return; |
| } |
| |
| #ifdef CONFIG_P2P |
| if (hapd->p2p && elems.wps_ie) { |
| struct wpabuf *wps; |
| wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA); |
| if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) { |
| wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request " |
| "due to mismatch with Requested Device " |
| "Type"); |
| wpabuf_free(wps); |
| return; |
| } |
| wpabuf_free(wps); |
| } |
| #endif /* CONFIG_P2P */ |
| |
| if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0) { |
| wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for " |
| "broadcast SSID ignored", MAC2STR(mgmt->sa)); |
| return; |
| } |
| |
| sta = ap_get_sta(hapd, mgmt->sa); |
| |
| #ifdef CONFIG_P2P |
| if ((hapd->conf->p2p & P2P_GROUP_OWNER) && |
| elems.ssid_len == P2P_WILDCARD_SSID_LEN && |
| os_memcmp(elems.ssid, P2P_WILDCARD_SSID, |
| P2P_WILDCARD_SSID_LEN) == 0) { |
| /* Process P2P Wildcard SSID like Wildcard SSID */ |
| elems.ssid_len = 0; |
| } |
| #endif /* CONFIG_P2P */ |
| |
| if (elems.ssid_len == 0 || |
| (elems.ssid_len == hapd->conf->ssid.ssid_len && |
| os_memcmp(elems.ssid, hapd->conf->ssid.ssid, elems.ssid_len) == |
| 0)) { |
| ssid = hapd->conf->ssid.ssid; |
| ssid_len = hapd->conf->ssid.ssid_len; |
| if (sta) |
| sta->ssid_probe = &hapd->conf->ssid; |
| } |
| |
| if (!ssid) { |
| if (!(mgmt->da[0] & 0x01)) { |
| char ssid_txt[33]; |
| ieee802_11_print_ssid(ssid_txt, elems.ssid, |
| elems.ssid_len); |
| wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR |
| " for foreign SSID '%s' (DA " MACSTR ")", |
| MAC2STR(mgmt->sa), ssid_txt, |
| MAC2STR(mgmt->da)); |
| } |
| return; |
| } |
| |
| /* TODO: verify that supp_rates contains at least one matching rate |
| * with AP configuration */ |
| #define MAX_PROBERESP_LEN 768 |
| buflen = MAX_PROBERESP_LEN; |
| #ifdef CONFIG_WPS |
| if (hapd->wps_probe_resp_ie) |
| buflen += wpabuf_len(hapd->wps_probe_resp_ie); |
| #endif /* CONFIG_WPS */ |
| #ifdef CONFIG_P2P |
| if (hapd->p2p_probe_resp_ie) |
| buflen += wpabuf_len(hapd->p2p_probe_resp_ie); |
| #endif /* CONFIG_P2P */ |
| resp = os_zalloc(buflen); |
| if (resp == NULL) |
| return; |
| epos = ((u8 *) resp) + MAX_PROBERESP_LEN; |
| |
| resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, |
| WLAN_FC_STYPE_PROBE_RESP); |
| os_memcpy(resp->da, mgmt->sa, ETH_ALEN); |
| os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN); |
| |
| os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN); |
| resp->u.probe_resp.beacon_int = |
| host_to_le16(hapd->iconf->beacon_int); |
| |
| /* hardware or low-level driver will setup seq_ctrl and timestamp */ |
| resp->u.probe_resp.capab_info = |
| host_to_le16(hostapd_own_capab_info(hapd, sta, 1)); |
| |
| pos = resp->u.probe_resp.variable; |
| *pos++ = WLAN_EID_SSID; |
| *pos++ = ssid_len; |
| os_memcpy(pos, ssid, ssid_len); |
| pos += ssid_len; |
| |
| /* Supported rates */ |
| pos = hostapd_eid_supp_rates(hapd, pos); |
| |
| /* DS Params */ |
| pos = hostapd_eid_ds_params(hapd, pos); |
| |
| pos = hostapd_eid_country(hapd, pos, epos - pos); |
| |
| /* ERP Information element */ |
| pos = hostapd_eid_erp_info(hapd, pos); |
| |
| /* Extended supported rates */ |
| pos = hostapd_eid_ext_supp_rates(hapd, pos); |
| |
| /* RSN, MDIE, WPA */ |
| pos = hostapd_eid_wpa(hapd, pos, epos - pos, sta); |
| |
| #ifdef CONFIG_IEEE80211N |
| pos = hostapd_eid_ht_capabilities(hapd, pos); |
| pos = hostapd_eid_ht_operation(hapd, pos); |
| #endif /* CONFIG_IEEE80211N */ |
| |
| pos = hostapd_eid_ext_capab(hapd, pos); |
| |
| /* Wi-Fi Alliance WMM */ |
| pos = hostapd_eid_wmm(hapd, pos); |
| |
| #ifdef CONFIG_WPS |
| if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) { |
| os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie), |
| wpabuf_len(hapd->wps_probe_resp_ie)); |
| pos += wpabuf_len(hapd->wps_probe_resp_ie); |
| } |
| #endif /* CONFIG_WPS */ |
| |
| #ifdef CONFIG_P2P |
| if ((hapd->conf->p2p & P2P_ENABLED) && elems.p2p && |
| hapd->p2p_probe_resp_ie) { |
| os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie), |
| wpabuf_len(hapd->p2p_probe_resp_ie)); |
| pos += wpabuf_len(hapd->p2p_probe_resp_ie); |
| } |
| #endif /* CONFIG_P2P */ |
| #ifdef CONFIG_P2P_MANAGER |
| if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) == |
| P2P_MANAGE) |
| pos = hostapd_eid_p2p_manage(hapd, pos); |
| #endif /* CONFIG_P2P_MANAGER */ |
| |
| if (hostapd_drv_send_mlme(hapd, resp, pos - (u8 *) resp) < 0) |
| perror("handle_probe_req: send"); |
| |
| os_free(resp); |
| |
| wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s " |
| "SSID", MAC2STR(mgmt->sa), |
| elems.ssid_len == 0 ? "broadcast" : "our"); |
| } |
| |
| |
| void ieee802_11_set_beacon(struct hostapd_data *hapd) |
| { |
| struct ieee80211_mgmt *head; |
| u8 *pos, *tail, *tailpos; |
| u16 capab_info; |
| size_t head_len, tail_len; |
| |
| #ifdef CONFIG_P2P |
| if ((hapd->conf->p2p & (P2P_ENABLED | P2P_GROUP_OWNER)) == P2P_ENABLED) |
| goto no_beacon; |
| #endif /* CONFIG_P2P */ |
| |
| #define BEACON_HEAD_BUF_SIZE 256 |
| #define BEACON_TAIL_BUF_SIZE 512 |
| head = os_zalloc(BEACON_HEAD_BUF_SIZE); |
| tail_len = BEACON_TAIL_BUF_SIZE; |
| #ifdef CONFIG_WPS |
| if (hapd->conf->wps_state && hapd->wps_beacon_ie) |
| tail_len += wpabuf_len(hapd->wps_beacon_ie); |
| #endif /* CONFIG_WPS */ |
| #ifdef CONFIG_P2P |
| if (hapd->p2p_beacon_ie) |
| tail_len += wpabuf_len(hapd->p2p_beacon_ie); |
| #endif /* CONFIG_P2P */ |
| tailpos = tail = os_malloc(tail_len); |
| if (head == NULL || tail == NULL) { |
| wpa_printf(MSG_ERROR, "Failed to set beacon data"); |
| os_free(head); |
| os_free(tail); |
| return; |
| } |
| |
| head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, |
| WLAN_FC_STYPE_BEACON); |
| head->duration = host_to_le16(0); |
| os_memset(head->da, 0xff, ETH_ALEN); |
| |
| os_memcpy(head->sa, hapd->own_addr, ETH_ALEN); |
| os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN); |
| head->u.beacon.beacon_int = |
| host_to_le16(hapd->iconf->beacon_int); |
| |
| /* hardware or low-level driver will setup seq_ctrl and timestamp */ |
| capab_info = hostapd_own_capab_info(hapd, NULL, 0); |
| head->u.beacon.capab_info = host_to_le16(capab_info); |
| pos = &head->u.beacon.variable[0]; |
| |
| /* SSID */ |
| *pos++ = WLAN_EID_SSID; |
| if (hapd->conf->ignore_broadcast_ssid == 2) { |
| /* clear the data, but keep the correct length of the SSID */ |
| *pos++ = hapd->conf->ssid.ssid_len; |
| os_memset(pos, 0, hapd->conf->ssid.ssid_len); |
| pos += hapd->conf->ssid.ssid_len; |
| } else if (hapd->conf->ignore_broadcast_ssid) { |
| *pos++ = 0; /* empty SSID */ |
| } else { |
| *pos++ = hapd->conf->ssid.ssid_len; |
| os_memcpy(pos, hapd->conf->ssid.ssid, |
| hapd->conf->ssid.ssid_len); |
| pos += hapd->conf->ssid.ssid_len; |
| } |
| |
| /* Supported rates */ |
| pos = hostapd_eid_supp_rates(hapd, pos); |
| |
| /* DS Params */ |
| pos = hostapd_eid_ds_params(hapd, pos); |
| |
| head_len = pos - (u8 *) head; |
| |
| tailpos = hostapd_eid_country(hapd, tailpos, |
| tail + BEACON_TAIL_BUF_SIZE - tailpos); |
| |
| /* ERP Information element */ |
| tailpos = hostapd_eid_erp_info(hapd, tailpos); |
| |
| /* Extended supported rates */ |
| tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos); |
| |
| /* RSN, MDIE, WPA */ |
| tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE - |
| tailpos, NULL); |
| |
| #ifdef CONFIG_IEEE80211N |
| tailpos = hostapd_eid_ht_capabilities(hapd, tailpos); |
| tailpos = hostapd_eid_ht_operation(hapd, tailpos); |
| #endif /* CONFIG_IEEE80211N */ |
| |
| tailpos = hostapd_eid_ext_capab(hapd, tailpos); |
| |
| /* Wi-Fi Alliance WMM */ |
| tailpos = hostapd_eid_wmm(hapd, tailpos); |
| |
| #ifdef CONFIG_WPS |
| if (hapd->conf->wps_state && hapd->wps_beacon_ie) { |
| os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie), |
| wpabuf_len(hapd->wps_beacon_ie)); |
| tailpos += wpabuf_len(hapd->wps_beacon_ie); |
| } |
| #endif /* CONFIG_WPS */ |
| |
| #ifdef CONFIG_P2P |
| if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) { |
| os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie), |
| wpabuf_len(hapd->p2p_beacon_ie)); |
| tailpos += wpabuf_len(hapd->p2p_beacon_ie); |
| } |
| #endif /* CONFIG_P2P */ |
| #ifdef CONFIG_P2P_MANAGER |
| if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) == |
| P2P_MANAGE) |
| tailpos = hostapd_eid_p2p_manage(hapd, tailpos); |
| #endif /* CONFIG_P2P_MANAGER */ |
| |
| tail_len = tailpos > tail ? tailpos - tail : 0; |
| |
| if (hostapd_drv_set_beacon(hapd, (u8 *) head, head_len, |
| tail, tail_len, hapd->conf->dtim_period, |
| hapd->iconf->beacon_int)) |
| wpa_printf(MSG_ERROR, "Failed to set beacon head/tail or DTIM " |
| "period"); |
| |
| os_free(tail); |
| os_free(head); |
| |
| #ifdef CONFIG_P2P |
| no_beacon: |
| #endif /* CONFIG_P2P */ |
| hostapd_set_bss_params(hapd, !!(ieee802_11_erp_info(hapd) & |
| ERP_INFO_USE_PROTECTION)); |
| } |
| |
| |
| void ieee802_11_set_beacons(struct hostapd_iface *iface) |
| { |
| size_t i; |
| for (i = 0; i < iface->num_bss; i++) |
| ieee802_11_set_beacon(iface->bss[i]); |
| } |
| |
| #endif /* CONFIG_NATIVE_WINDOWS */ |