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diff -rduNp linux-2.6.21.5.orig/include/net/xfrmudp.h linux-2.6.21.5/include/net/xfrmudp.h
--- linux-2.6.21.5.orig/include/net/xfrmudp.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.21.5/include/net/xfrmudp.h 2007-06-21 10:53:38.000000000 +0200
@@ -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);
diff -rduNp linux-2.6.21.5.orig/net/ipv4/Kconfig linux-2.6.21.5/net/ipv4/Kconfig
--- linux-2.6.21.5.orig/net/ipv4/Kconfig 2007-06-11 20:37:06.000000000 +0200
+++ linux-2.6.21.5/net/ipv4/Kconfig 2007-06-21 10:53:38.000000000 +0200
@@ -349,6 +349,12 @@ config SYN_COOKIES
be taken as absolute truth.
SYN cookies may prevent correct error reporting on clients when the
+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.
+
server is really overloaded. If this happens frequently better turn
them off.
diff -rduNp linux-2.6.21.5.orig/net/ipv4/udp.c linux-2.6.21.5/net/ipv4/udp.c
--- linux-2.6.21.5.orig/net/ipv4/udp.c 2007-06-11 20:37:06.000000000 +0200
+++ linux-2.6.21.5/net/ipv4/udp.c 2007-06-21 10:56:18.000000000 +0200
@@ -108,6 +108,7 @@
*/
DEFINE_SNMP_STAT(struct udp_mib, udp_statistics) __read_mostly;
+#include <net/xfrmudp.h>
struct hlist_head udp_hash[UDP_HTABLE_SIZE];
DEFINE_RWLOCK(udp_hash_lock);
@@ -915,6 +916,44 @@ int udp_disconnect(struct sock *sk, int
return 0;
}
+#if defined(CONFIG_XFRM) || defined(CONFIG_IPSEC_NAT_TRAVERSAL)
+
+/* if XFRM isn't a module, then register it directly. */
+#if !defined(CONFIG_XFRM_MODULE)
+static xfrm4_rcv_encap_t xfrm4_rcv_encap_func = xfrm4_rcv_encap;
+#else
+static xfrm4_rcv_encap_t xfrm4_rcv_encap_func = NULL;
+#endif
+
+static xfrm4_rcv_encap_t xfrm4_rcv_encap_func;
+
+int udp4_register_esp_rcvencap(xfrm4_rcv_encap_t func
+ , xfrm4_rcv_encap_t *oldfunc)
+{
+ if(oldfunc != NULL) {
+ *oldfunc = xfrm4_rcv_encap_func;
+ }
+
+#if 0
+ if(xfrm4_rcv_encap_func != NULL)
+ return -1;
+#endif
+
+ xfrm4_rcv_encap_func = func;
+ return 0;
+}
+
+int udp4_unregister_esp_rcvencap(xfrm4_rcv_encap_t func)
+{
+ if(xfrm4_rcv_encap_func != func)
+ return -1;
+
+ xfrm4_rcv_encap_func = NULL;
+ return 0;
+}
+#endif /* CONFIG_XFRM || defined(CONFIG_IPSEC_NAT_TRAVERSAL)*/
+
+
/* return:
* 1 if the the UDP system should process it
* 0 if we should drop this packet
@@ -922,9 +961,9 @@ int udp_disconnect(struct sock *sk, int
*/
static int udp_encap_rcv(struct sock * sk, struct sk_buff *skb)
{
-#ifndef CONFIG_XFRM
+#if !defined(CONFIG_XFRM) && !defined(CONFIG_IPSEC_NAT_TRAVERSAL)
return 1;
-#else
+#else /* either CONFIG_XFRM or CONFIG_IPSEC_NAT_TRAVERSAL */
struct udp_sock *up = udp_sk(sk);
struct udphdr *uh;
struct iphdr *iph;
@@ -1052,9 +1091,14 @@ int udp_queue_rcv_skb(struct sock * sk,
}
if (ret < 0) {
/* process the ESP packet */
- ret = xfrm4_rcv_encap(skb, up->encap_type);
- UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
- return -ret;
+ if (xfrm4_rcv_encap_func != NULL) {
+ ret = (*xfrm4_rcv_encap_func)(skb, up->encap_type);
+ UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
+ } else {
+ UDP_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
+ ret = 1;
+ }
+ return ret;
}
/* FALLTHROUGH -- it's a UDP Packet */
}
@@ -1733,3 +1777,9 @@ EXPORT_SYMBOL(udp_poll);
EXPORT_SYMBOL(udp_proc_register);
EXPORT_SYMBOL(udp_proc_unregister);
#endif
+
+#if defined(CONFIG_IPSEC_NAT_TRAVERSAL)
+EXPORT_SYMBOL(udp4_register_esp_rcvencap);
+EXPORT_SYMBOL(udp4_unregister_esp_rcvencap);
+#endif
+
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