Android: nl80211: Work around limited genl_ctrl_resolve()

Android ICS system/core/libnl_2 has very limited genl_ctrl_resolve()
implementation that cannot handle names other than nlctrl. Work
around that by implementing more complete genl_ctrl_resolve()
functionality within driver_nl80211.c for Android builds.

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

src/drivers/driver_nl80211.c

@@ -2572,6 +2572,42 @@ static int wpa_driver_nl80211_capa(struct wpa_driver_nl80211_data *drv)
 }
 
 
+#ifdef ANDROID
+static int android_genl_ctrl_resolve(struct nl_handle *handle,
+				     const char *name)
+{
+	/*
+	 * Android ICS has very minimal genl_ctrl_resolve() implementation, so
+	 * need to work around that.
+	 */
+	struct nl_cache *cache = NULL;
+	struct genl_family *nl80211 = NULL;
+	int id = -1;
+
+	if (genl_ctrl_alloc_cache(handle, &cache) < 0) {
+		wpa_printf(MSG_ERROR, "nl80211: Failed to allocate generic "
+			   "netlink cache");
+		goto fail;
+	}
+
+	nl80211 = genl_ctrl_search_by_name(cache, name);
+	if (nl80211 == NULL)
+		goto fail;
+
+	id = genl_family_get_id(nl80211);
+
+fail:
+	if (nl80211)
+		genl_family_put(nl80211);
+	if (cache)
+		nl_cache_free(cache);
+
+	return id;
+}
+#define genl_ctrl_resolve android_genl_ctrl_resolve
+#endif /* ANDROID */
+
+
 static int wpa_driver_nl80211_init_nl_global(struct nl80211_global *global)
 {
 	int ret;