OWE: Add AP support for transition mode

The new owe_transition_bssid and owe_transition_ssid parameters can be
used to configure hostapd to advertise the OWE Transition Mode element.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

hostapd/config_file.c

@@ -3773,6 +3773,28 @@ static int hostapd_config_fill(struct hostapd_config *conf,
 	} else if (os_strcmp(buf, "dpp_csign_expiry") == 0) {
 		bss->dpp_csign_expiry = strtol(pos, NULL, 0);
 #endif /* CONFIG_DPP */
+#ifdef CONFIG_OWE
+	} else if (os_strcmp(buf, "owe_transition_bssid") == 0) {
+		if (hwaddr_aton(pos, bss->owe_transition_bssid)) {
+			wpa_printf(MSG_ERROR,
+				   "Line %d: invalid owe_transition_bssid",
+				   line);
+			return 1;
+		}
+	} else if (os_strcmp(buf, "owe_transition_ssid") == 0) {
+		size_t slen;
+		char *str = wpa_config_parse_string(pos, &slen);
+
+		if (!str || slen < 1 || slen > SSID_MAX_LEN) {
+			wpa_printf(MSG_ERROR, "Line %d: invalid SSID '%s'",
+				   line, pos);
+			os_free(str);
+			return 1;
+		}
+		os_memcpy(bss->owe_transition_ssid, str, slen);
+		bss->owe_transition_ssid_len = slen;
+		os_free(str);
+#endif /* CONFIG_OWE */
 	} else {
 		wpa_printf(MSG_ERROR,
 			   "Line %d: unknown configuration item '%s'",

hostapd/hostapd.conf

@@ -1407,6 +1407,12 @@ own_ip_addr=127.0.0.1
 # 1-65535 DH Group to use for FILS PFS
 #fils_dh_group=0
 
+# OWE transition mode configuration
+# Pointer to the matching open/OWE BSS
+#owe_transition_bssid=<bssid>
+# SSID in same format as ssid2 described above.
+#owe_transition_ssid=<SSID>
+
 # DHCP server for FILS HLP
 # If configured, hostapd will act as a DHCP relay for all FILS HLP requests
 # that include a DHCPDISCOVER message and send them to the specific DHCP

src/ap/ap_config.h

@@ -644,6 +644,12 @@ struct hostapd_bss_config {
 	struct wpabuf *dpp_csign;
 	unsigned int dpp_csign_expiry;
 #endif /* CONFIG_DPP */
+
+#ifdef CONFIG_OWE
+	macaddr owe_transition_bssid;
+	u8 owe_transition_ssid[SSID_MAX_LEN];
+	size_t owe_transition_ssid_len;
+#endif /* CONFIG_OWE */
 };
 
 /**

src/ap/beacon.c

@@ -363,6 +363,63 @@ static u8 * hostapd_eid_supported_op_classes(struct hostapd_data *hapd, u8 *eid)
 }
 
 
+#ifdef CONFIG_OWE
+static int hostapd_eid_owe_trans_enabled(struct hostapd_data *hapd)
+{
+	return hapd->conf->owe_transition_ssid_len > 0 &&
+		!is_zero_ether_addr(hapd->conf->owe_transition_bssid);
+}
+#endif /* CONFIG_OWE */
+
+
+static size_t hostapd_eid_owe_trans_len(struct hostapd_data *hapd)
+{
+#ifdef CONFIG_OWE
+	if (!hostapd_eid_owe_trans_enabled(hapd))
+		return 0;
+	return 6 + ETH_ALEN + 1 + hapd->conf->owe_transition_ssid_len;
+#else /* CONFIG_OWE */
+	return 0;
+#endif /* CONFIG_OWE */
+}
+
+
+static u8 * hostapd_eid_owe_trans(struct hostapd_data *hapd, u8 *eid,
+				  size_t len)
+{
+#ifdef CONFIG_OWE
+	u8 *pos = eid;
+	size_t elen;
+
+	if (!hostapd_eid_owe_trans_enabled(hapd))
+		return pos;
+
+	elen = hostapd_eid_owe_trans_len(hapd);
+	if (len < elen) {
+		wpa_printf(MSG_DEBUG,
+			   "OWE: Not enough room in the buffer for OWE IE");
+		return pos;
+	}
+
+	*pos++ = WLAN_EID_VENDOR_SPECIFIC;
+	*pos++ = elen - 2;
+	WPA_PUT_BE24(pos, OUI_WFA);
+	pos += 3;
+	*pos++ = OWE_OUI_TYPE;
+	os_memcpy(pos, hapd->conf->owe_transition_bssid, ETH_ALEN);
+	pos += ETH_ALEN;
+	*pos++ = hapd->conf->owe_transition_ssid_len;
+	os_memcpy(pos, hapd->conf->owe_transition_ssid,
+		  hapd->conf->owe_transition_ssid_len);
+	pos += hapd->conf->owe_transition_ssid_len;
+
+	return pos;
+#else /* CONFIG_OWE */
+	return eid;
+#endif /* CONFIG_OWE */
+}
+
+
 static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 				   const struct ieee80211_mgmt *req,
 				   int is_p2p, size_t *resp_len)
@@ -400,6 +457,7 @@ static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 #endif /* CONFIG_IEEE80211AX */
 
 	buflen += hostapd_mbo_ie_len(hapd);
+	buflen += hostapd_eid_owe_trans_len(hapd);
 
 	resp = os_zalloc(buflen);
 	if (resp == NULL)
@@ -545,6 +603,7 @@ static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 #endif /* CONFIG_HS20 */
 
 	pos = hostapd_eid_mbo(hapd, pos, (u8 *) resp + buflen - pos);
+	pos = hostapd_eid_owe_trans(hapd, pos, (u8 *) resp + buflen - pos);
 
 	if (hapd->conf->vendor_elements) {
 		os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
@@ -1062,6 +1121,7 @@ int ieee802_11_build_ap_params(struct hostapd_data *hapd,
 #endif /* CONFIG_IEEE80211AX */
 
 	tail_len += hostapd_mbo_ie_len(hapd);
+	tail_len += hostapd_eid_owe_trans_len(hapd);
 
 	tailpos = tail = os_malloc(tail_len);
 	if (head == NULL || tail == NULL) {
@@ -1229,6 +1289,8 @@ int ieee802_11_build_ap_params(struct hostapd_data *hapd,
 #endif /* CONFIG_HS20 */
 
 	tailpos = hostapd_eid_mbo(hapd, tailpos, tail + tail_len - tailpos);
+	tailpos = hostapd_eid_owe_trans(hapd, tailpos,
+					tail + tail_len - tailpos);
 
 	if (hapd->conf->vendor_elements) {
 		os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),

src/common/ieee802_11_defs.h

@@ -1196,6 +1196,8 @@ struct ieee80211_ampe_ie {
 #define OSEN_IE_VENDOR_TYPE 0x506f9a12
 #define MBO_IE_VENDOR_TYPE 0x506f9a16
 #define MBO_OUI_TYPE 22
+#define OWE_IE_VENDOR_TYPE 0x506f9a1c
+#define OWE_OUI_TYPE 28
 
 #define WMM_OUI_TYPE 2
 #define WMM_OUI_SUBTYPE_INFORMATION_ELEMENT 0