diff -urN linux-2.6.21.1.old/net/ipv4/netfilter/ipt_ipp2p.c linux-2.6.21.1.dev/net/ipv4/netfilter/ipt_ipp2p.c
--- linux-2.6.21.1.old/net/ipv4/netfilter/ipt_ipp2p.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.21.1.dev/net/ipv4/netfilter/ipt_ipp2p.c 2007-05-26 20:21:54.587864144 +0200
-@@ -0,0 +1,881 @@
+@@ -0,0 +1,882 @@
+#if defined(MODVERSIONS)
+#include <linux/modversions.h>
+#endif
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+ .name = "ipp2p",
+ .match = &match,
++ .family = AF_INET,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
+ .matchsize = sizeof(struct ipt_p2p_info),
+#endif