--- src/sys/net/pfil.c	2008/09/14 11:13:00	1.11
+++ src/sys/net/pfil.c	2008/09/16 11:53:33	1.12
@@ -42,6 +42,17 @@
 #include <net/pfil.h>
 #include <net/netmsg2.h>
 
+/*
+ * The packet filter hooks are designed for anything to call them to
+ * possibly intercept the packet.
+ */
+struct packet_filter_hook {
+        TAILQ_ENTRY(packet_filter_hook) pfil_link;
+	pfil_func_t	pfil_func;
+	void		*pfil_arg;
+	int		pfil_flags;
+};
+
 #define PFIL_CFGPORT	cpu_portfn(0)
 
 struct netmsg_pfil {