Interworking: Store HESSID in BSS entry

This makes it more convenient to match BSS entries that belong to the
same homogenous ESS.

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

wpa_supplicant/bss.c

@@ -35,6 +35,22 @@
 #define WPA_BSS_IES_CHANGED_FLAG	BIT(8)
 
 
+static void wpa_bss_set_hessid(struct wpa_bss *bss)
+{
+#ifdef CONFIG_INTERWORKING
+	const u8 *ie = wpa_bss_get_ie(bss, WLAN_EID_INTERWORKING);
+	if (ie == NULL || (ie[1] != 7 && ie[1] != 9)) {
+		os_memset(bss->hessid, 0, ETH_ALEN);
+		return;
+	}
+	if (ie[1] == 7)
+		os_memcpy(bss->hessid, ie + 3, ETH_ALEN);
+	else
+		os_memcpy(bss->hessid, ie + 5, ETH_ALEN);
+#endif /* CONFIG_INTERWORKING */
+}
+
+
 struct wpa_bss_anqp * wpa_bss_anqp_alloc(void)
 {
 	struct wpa_bss_anqp *anqp;
@@ -227,6 +243,7 @@ static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s,
 	bss->ie_len = res->ie_len;
 	bss->beacon_ie_len = res->beacon_ie_len;
 	os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
+	wpa_bss_set_hessid(bss);
 
 	dl_list_add_tail(&wpa_s->bss, &bss->list);
 	dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
@@ -407,6 +424,8 @@ static void wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
 		}
 		dl_list_add(prev, &bss->list_id);
 	}
+	if (changes & WPA_BSS_IES_CHANGED_FLAG)
+		wpa_bss_set_hessid(bss);
 	dl_list_add_tail(&wpa_s->bss, &bss->list);
 
 	notify_bss_changes(wpa_s, changes, bss);

wpa_supplicant/bss.h

@@ -47,6 +47,7 @@ struct wpa_bss_anqp {
  * @flags: information flags about the BSS/IBSS (WPA_BSS_*)
  * @last_update_idx: Index of the last scan update
  * @bssid: BSSID
+ * @hessid: HESSID
  * @freq: frequency of the channel in MHz (e.g., 2412 = channel 1)
  * @beacon_int: beacon interval in TUs (host byte order)
  * @caps: capability information field in host byte order
@@ -69,6 +70,7 @@ struct wpa_bss {
 	unsigned int last_update_idx;
 	unsigned int flags;
 	u8 bssid[ETH_ALEN];
+	u8 hessid[ETH_ALEN];
 	u8 ssid[32];
 	size_t ssid_len;
 	int freq;