120-openswan-2.4.0.kernel-2.6-natt.patch

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Index: linux-2.6.21.7/include/net/xfrmudp.h
===================================================================
--- /dev/null
+++ linux-2.6.21.7/include/net/xfrmudp.h
@@ -0,0 +1,10 @@
+/*
+ * pointer to function for type that xfrm4_input wants, to permit
+ * decoupling of XFRM from udp.c
+ */
+#define HAVE_XFRM4_UDP_REGISTER
+
+typedef int (*xfrm4_rcv_encap_t)(struct sk_buff *skb, __u16 encap_type);
+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);
Index: linux-2.6.21.7/net/ipv4/Kconfig
===================================================================
--- linux-2.6.21.7.orig/net/ipv4/Kconfig
+++ linux-2.6.21.7/net/ipv4/Kconfig
@@ -266,6 +266,12 @@ config NET_IPGRE_BROADCAST
 	  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 IPSEC_NAT_TRAVERSAL
+	bool "IPSEC NAT-Traversal (KLIPS compatible)"
+	depends on INET
+	---help---
+          Includes support for RFC3947/RFC3948 NAT-Traversal of ESP over UDP.
+
 config IP_MROUTE
 	bool "IP: multicast routing"
 	depends on IP_MULTICAST