diff --git a/sfe_ipv4_esp.h b/sfe_ipv4_esp.h
new file mode 100644
index 0000000..f889605
--- /dev/null
+++ b/sfe_ipv4_esp.h
@@ -0,0 +1,21 @@
+/*
+ * sfe_ipv4_esp.h
+ *	Shortcut forwarding engine - IPv4 ESP header file
+ *
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+int sfe_ipv4_recv_esp(struct sfe_ipv4 *si, struct sk_buff *skb, struct net_device *dev, unsigned int len,
+			struct iphdr *iph, unsigned int ihl, bool sync_on_find, bool tun_outer);