[NETFILTER]: Fix xfrm lookup in ip_route_me_harder/ip6_route_me_harder
ip_route_me_harder doesn't use the port numbers of the xfrm lookup and
uses ip_route_input for non-local addresses which doesn't do a xfrm
lookup, ip6_route_me_harder doesn't do a xfrm lookup at all.
Use xfrm_decode_session and do the lookup manually, make sure both
only do the lookup if the packet hasn't been transformed already.
Makeing sure the lookup only happens once needs a new field in the
IP6CB, which exceeds the size of skb->cb. The size of skb->cb is
increased to 48b. Apparently the IPv6 mobile extensions need some
more room anyway.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 5cfc715..9c8f4c9 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -192,6 +192,9 @@
__u16 dst1;
__u16 lastopt;
__u32 nhoff;
+ __u16 flags;
+
+#define IP6SKB_XFRM_TRANSFORMED 1
};
#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 483cfc4..e5fd66c 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -251,7 +251,7 @@
* want to keep them across layers you have to do a skb_clone()
* first. This is owned by whoever has the skb queued ATM.
*/
- char cb[40];
+ char cb[48];
unsigned int len,
data_len,
diff --git a/include/net/ip.h b/include/net/ip.h
index 52f4d9c..a494d04 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -39,7 +39,8 @@
#define IPSKB_FORWARDED 1
#define IPSKB_XFRM_TUNNEL_SIZE 2
-#define IPSKB_FRAG_COMPLETE 4
+#define IPSKB_XFRM_TRANSFORMED 4
+#define IPSKB_FRAG_COMPLETE 8
};
struct ipcm_cookie
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 297d09d..d6111a2 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -668,7 +668,7 @@
return xfrm_policy_check(sk, dir, skb, AF_INET6);
}
-
+extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)