-diff -Nur linux-2.6.21.1/include/net/xfrmudp.h linux-2.6.21.1-owrt/include/net/xfrmudp.h
---- linux-2.6.21.1/include/net/xfrmudp.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux-2.6.21.1-owrt/include/net/xfrmudp.h 2007-05-14 11:26:11.000000000 +0200
+diff -urN linux-2.6.21.1.old/include/net/xfrmudp.h linux-2.6.21.1.dev/include/net/xfrmudp.h
+--- linux-2.6.21.1.old/include/net/xfrmudp.h 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.dev/include/net/xfrmudp.h 2007-05-26 20:24:53.933599448 +0200
@@ -0,0 +1,10 @@
+/*
+ * pointer to function for type that xfrm4_input wants, to permit
+extern int udp4_register_esp_rcvencap(xfrm4_rcv_encap_t func
+ , xfrm4_rcv_encap_t *oldfunc);
+extern int udp4_unregister_esp_rcvencap(xfrm4_rcv_encap_t func);
-diff -Nur linux-2.6.21.1/net/ipv4/Kconfig linux-2.6.21.1-owrt/net/ipv4/Kconfig
---- linux-2.6.21.1/net/ipv4/Kconfig 2007-04-27 23:49:26.000000000 +0200
-+++ linux-2.6.21.1-owrt/net/ipv4/Kconfig 2007-05-14 11:26:11.000000000 +0200
+diff -urN linux-2.6.21.1.old/net/ipv4/Kconfig linux-2.6.21.1.dev/net/ipv4/Kconfig
+--- linux-2.6.21.1.old/net/ipv4/Kconfig 2007-04-27 23:49:26.000000000 +0200
++++ linux-2.6.21.1.dev/net/ipv4/Kconfig 2007-05-26 20:24:53.965594584 +0200
@@ -266,6 +266,12 @@
Network), but can be distributed all over the Internet. If you want
to do that, say Y here and to "IP multicast routing" below.
config IP_MROUTE
bool "IP: multicast routing"
depends on IP_MULTICAST
-diff -Nur linux-2.6.21.1/net/ipv4/udp.c linux-2.6.21.1-owrt/net/ipv4/udp.c
---- linux-2.6.21.1/net/ipv4/udp.c 2007-04-27 23:49:26.000000000 +0200
-+++ linux-2.6.21.1-owrt/net/ipv4/udp.c 2007-05-14 11:42:44.000000000 +0200
+diff -urN linux-2.6.21.1.old/net/ipv4/udp.c linux-2.6.21.1.dev/net/ipv4/udp.c
+--- linux-2.6.21.1.old/net/ipv4/udp.c 2007-04-27 23:49:26.000000000 +0200
++++ linux-2.6.21.1.dev/net/ipv4/udp.c 2007-05-26 20:24:53.966594432 +0200
@@ -101,12 +101,15 @@
#include <net/route.h>
#include <net/checksum.h>