Index: sys/net/iflib.h
===================================================================
--- sys/net/iflib.h
+++ sys/net/iflib.h
@@ -131,7 +131,12 @@
 	uint8_t			ipi_mflags;	/* packet mbuf flags */
 
 	uint32_t		ipi_tcp_seq;	/* tcp seqno */
-	uint32_t		__spare0__;
+
+	/* Tunneled packets offload handling */
+	uint8_t			ipi_inner_ehdrlen;	/* inner ether header length */
+	uint8_t			ipi_inner_ip_hlen;	/* inner ip header length */
+	uint8_t			ipi_inner_l4_hlen;	/* inner l4 header length */
+	uint8_t			ipi_inner_ipproto;	/* inner ip protocol */
 } *if_pkt_info_t;
 
 typedef struct if_irq {