--- zzzz-none-000/linux-4.1.52/include/uapi/linux/netfilter/nf_conntrack_tuple_common.h	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/include/uapi/linux/netfilter/nf_conntrack_tuple_common.h	2022-03-02 11:37:13.000000000 +0000
@@ -32,6 +32,12 @@
 	struct {
 		__be16 key;	/* GRE key is 32bit, PPtP only uses 16bit */
 	} gre;
+#if defined(CONFIG_BCM_KF_PROTO_ESP) && \
+	(defined(CONFIG_NF_CT_PROTO_ESP) || defined(CONFIG_NF_CT_PROTO_ESP_MODULE))
+	struct {
+		__be16 spi;
+	} esp;
+#endif
 };
 
 #define CTINFO2DIR(ctinfo) ((ctinfo) >= IP_CT_IS_REPLY ? IP_CT_DIR_REPLY : IP_CT_DIR_ORIGINAL)