--- zzzz-none-000/linux-4.1.52/include/net/netfilter/nf_conntrack_tuple.h	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/include/net/netfilter/nf_conntrack_tuple.h	2022-03-02 11:37:13.000000000 +0000
@@ -61,6 +61,12 @@
 			struct {
 				__be16 key;
 			} 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
 		} u;
 
 		/* The protocol. */