wpa_supplicant: Initial Revision 0.8.X
Based on:
commit 0725cc7b7efc434910e89865c42eda7ce61bbf08
Author: Jouni Malinen <j@w1.fi>
Date: Thu Apr 21 20:41:01 2011 +0300
Enable CONFIG_DRIVER_NL80211=y in the default configuration
nl80211 should be preferred over WEXT with any recent Linux
kernel version.
Change-Id: I26aec5afbbd4f4a1f5fd900912545b6f5050de64
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/src/ap/beacon.c b/src/ap/beacon.c
new file mode 100644
index 0000000..5544925
--- /dev/null
+++ b/src/ap/beacon.c
@@ -0,0 +1,535 @@
+/*
+ * 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 */