v4.19.13 snapshot.
diff --git a/include/net/netns/packet.h b/include/net/netns/packet.h
new file mode 100644
index 0000000..aae69bb
--- /dev/null
+++ b/include/net/netns/packet.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Packet network namespace
+ */
+#ifndef __NETNS_PACKET_H__
+#define __NETNS_PACKET_H__
+
+#include <linux/rculist.h>
+#include <linux/mutex.h>
+
+struct netns_packet {
+ struct mutex sklist_lock;
+ struct hlist_head sklist;
+};
+
+#endif /* __NETNS_PACKET_H__ */