wlantest: Update BSS IEs based on EAPOL-Key msg 3/4

If no Beacon or Probe Response frame has been seen in the capture, use
the IEs from EAPOL-Key msg 3/4 to set up BSS information.

Signed-off-by: Jouni Malinen <j@w1.fi>

wlantest/bss.c

@@ -129,7 +129,7 @@ static void bss_add_pmk(struct wlantest *wt, struct wlantest_bss *bss)
 
 
 void bss_update(struct wlantest *wt, struct wlantest_bss *bss,
-		struct ieee802_11_elems *elems)
+		struct ieee802_11_elems *elems, int beacon)
 {
 	struct wpa_ie_data data;
 	int update = 0;
@@ -137,15 +137,18 @@ void bss_update(struct wlantest *wt, struct wlantest_bss *bss,
 	if (bss->capab_info != bss->prev_capab_info)
 		update = 1;
 
-	if (elems->ssid == NULL || elems->ssid_len > 32) {
+	if (beacon && (!elems->ssid || elems->ssid_len > 32)) {
-		wpa_printf(MSG_INFO, "Invalid or missing SSID in a Beacon "
+		wpa_printf(MSG_INFO,
-			   "frame for " MACSTR, MAC2STR(bss->bssid));
+			   "Invalid or missing SSID in a %s frame for " MACSTR,
+			   beacon == 1 ? "Beacon" : "Probe Response",
+			   MAC2STR(bss->bssid));
 		bss->parse_error_reported = 1;
 		return;
 	}
 
-	if (bss->ssid_len != elems->ssid_len ||
+	if (beacon &&
-	    os_memcmp(bss->ssid, elems->ssid, bss->ssid_len) != 0) {
+	    (bss->ssid_len != elems->ssid_len ||
+	     os_memcmp(bss->ssid, elems->ssid, bss->ssid_len) != 0)) {
 		wpa_printf(MSG_DEBUG, "Store SSID '%s' for BSSID " MACSTR,
 			   wpa_ssid_txt(elems->ssid, elems->ssid_len),
 			   MAC2STR(bss->bssid));
@@ -223,7 +226,11 @@ void bss_update(struct wlantest *wt, struct wlantest_bss *bss,
 	if (!update)
 		return;
 
-	bss->beacon_seen = 1;
+	if (beacon == 1)
+		bss->beacon_seen = 1;
+	else if (beacon == 2)
+		bss->proberesp_seen = 1;
+	bss->ies_set = 1;
 	bss->prev_capab_info = bss->capab_info;
 	bss->proto = 0;
 	bss->pairwise_cipher = 0;

wlantest/rx_eapol.c

@@ -222,6 +222,25 @@ static void derive_ptk(struct wlantest *wt, struct wlantest_bss *bss,
 }
 
 
+static void elems_from_eapol_ie(struct ieee802_11_elems *elems,
+				struct wpa_eapol_ie_parse *ie)
+{
+	os_memset(elems, 0, sizeof(*elems));
+	if (ie->wpa_ie) {
+		elems->wpa_ie = ie->wpa_ie + 2;
+		elems->wpa_ie_len = ie->wpa_ie_len - 2;
+	}
+	if (ie->rsn_ie) {
+		elems->rsn_ie = ie->rsn_ie + 2;
+		elems->rsn_ie_len = ie->rsn_ie_len - 2;
+	}
+	if (ie->osen) {
+		elems->osen = ie->osen + 2;
+		elems->osen_len = ie->osen_len - 2;
+	}
+}
+
+
 static void rx_data_eapol_key_2_of_4(struct wlantest *wt, const u8 *dst,
 				     const u8 *src, const u8 *data, size_t len)
 {
@@ -268,19 +287,7 @@ static void rx_data_eapol_key_2_of_4(struct wlantest *wt, const u8 *dst,
 	if (!sta->assocreq_seen) {
 		struct ieee802_11_elems elems;
 
-		os_memset(&elems, 0, sizeof(elems));
+		elems_from_eapol_ie(&elems, &ie);
-		if (ie.wpa_ie) {
-			elems.wpa_ie = ie.wpa_ie + 2;
-			elems.wpa_ie_len = ie.wpa_ie_len - 2;
-		}
-		if (ie.rsn_ie) {
-			elems.rsn_ie = ie.rsn_ie + 2;
-			elems.rsn_ie_len = ie.rsn_ie_len - 2;
-		}
-		if (ie.osen) {
-			elems.osen = ie.osen + 2;
-			elems.osen_len = ie.osen_len - 2;
-		}
 		wpa_printf(MSG_DEBUG,
 			   "Update STA data based on IEs in EAPOL-Key 2/4");
 		sta_update_assoc(sta, &elems);
@@ -750,6 +757,15 @@ static void rx_data_eapol_key_3_of_4(struct wlantest *wt, const u8 *dst,
 		return;
 	}
 
+	if (!bss->ies_set) {
+		struct ieee802_11_elems elems;
+
+		elems_from_eapol_ie(&elems, &ie);
+		wpa_printf(MSG_DEBUG,
+			   "Update BSS data based on IEs in EAPOL-Key 3/4");
+		bss_update(wt, bss, &elems, 0);
+	}
+
 	if ((ie.wpa_ie &&
 	     os_memcmp(ie.wpa_ie, bss->wpaie, ie.wpa_ie_len) != 0) ||
 	    (ie.wpa_ie == NULL && bss->wpaie[0])) {

wlantest/rx_mgmt.c

@@ -86,7 +86,7 @@ static void rx_mgmt_beacon(struct wlantest *wt, const u8 *data, size_t len)
 		return;
 	}
 
-	bss_update(wt, bss, &elems);
+	bss_update(wt, bss, &elems, 1);
 
 	mme = get_ie(mgmt->u.beacon.variable, len - offset, WLAN_EID_MMIE);
 	if (!mme) {
@@ -173,7 +173,7 @@ static void rx_mgmt_probe_resp(struct wlantest *wt, const u8 *data, size_t len)
 		return;
 	}
 
-	bss_update(wt, bss, &elems);
+	bss_update(wt, bss, &elems, 2);
 }
 
 

wlantest/sta.c

@@ -156,7 +156,8 @@ void sta_update_assoc(struct wlantest_sta *sta, struct ieee802_11_elems *elems)
 			   MAC2STR(sta->addr), sta->pairwise_cipher,
 			   MAC2STR(bss->bssid), bss->pairwise_cipher);
 	}
-	if (sta->proto && data.group_cipher != bss->group_cipher) {
+	if (sta->proto && data.group_cipher != bss->group_cipher &&
+	    bss->ies_set) {
 		wpa_printf(MSG_INFO, "Mismatch in group cipher: STA "
 			   MACSTR " 0x%x != BSS " MACSTR " 0x%x",
 			   MAC2STR(sta->addr), data.group_cipher,

wlantest/wlantest.h

@@ -135,6 +135,7 @@ struct wlantest_bss {
 	size_t ssid_len;
 	int beacon_seen;
 	int proberesp_seen;
+	int ies_set;
 	int parse_error_reported;
 	u8 wpaie[257];
 	u8 rsnie[257];
@@ -265,7 +266,7 @@ struct wlantest_bss * bss_find(struct wlantest *wt, const u8 *bssid);
 struct wlantest_bss * bss_get(struct wlantest *wt, const u8 *bssid);
 void bss_deinit(struct wlantest_bss *bss);
 void bss_update(struct wlantest *wt, struct wlantest_bss *bss,
-		struct ieee802_11_elems *elems);
+		struct ieee802_11_elems *elems, int beacon);
 void bss_flush(struct wlantest *wt);
 int bss_add_pmk_from_passphrase(struct wlantest_bss *bss,
 				const char *passphrase);