v4.19.13 snapshot.
diff --git a/include/linux/ip.h b/include/linux/ip.h
new file mode 100644
index 0000000..492bc65
--- /dev/null
+++ b/include/linux/ip.h
@@ -0,0 +1,37 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * Definitions for the IP protocol.
+ *
+ * Version: @(#)ip.h 1.0.2 04/28/93
+ *
+ * Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#ifndef _LINUX_IP_H
+#define _LINUX_IP_H
+
+#include <linux/skbuff.h>
+#include <uapi/linux/ip.h>
+
+static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
+{
+ return (struct iphdr *)skb_network_header(skb);
+}
+
+static inline struct iphdr *inner_ip_hdr(const struct sk_buff *skb)
+{
+ return (struct iphdr *)skb_inner_network_header(skb);
+}
+
+static inline struct iphdr *ipip_hdr(const struct sk_buff *skb)
+{
+ return (struct iphdr *)skb_transport_header(skb);
+}
+#endif /* _LINUX_IP_H */