v4.19.13 snapshot.
diff --git a/include/linux/if_tunnel.h b/include/linux/if_tunnel.h
new file mode 100644
index 0000000..2660652
--- /dev/null
+++ b/include/linux/if_tunnel.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _IF_TUNNEL_H_
+#define _IF_TUNNEL_H_
+
+#include <linux/ip.h>
+#include <linux/in6.h>
+#include <uapi/linux/if_tunnel.h>
+#include <linux/u64_stats_sync.h>
+
+/*
+ * Locking : hash tables are protected by RCU and RTNL
+ */
+
+#define for_each_ip_tunnel_rcu(pos, start) \
+ for (pos = rcu_dereference(start); pos; pos = rcu_dereference(pos->next))
+
+#endif /* _IF_TUNNEL_H_ */