[NETFILTER]: ip6table_mangle: reroute when nfmark changes in NF_IP6_LOCAL_OUT

Now that IPv6 supports policy routing we need to reroute in NF_IP6_LOCAL_OUT
when the mark value changes.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netfilter_ipv6.h b/include/linux/netfilter_ipv6.h
index 52a7b9e..d97e268 100644
--- a/include/linux/netfilter_ipv6.h
+++ b/include/linux/netfilter_ipv6.h
@@ -73,6 +73,7 @@
 };
 
 #ifdef CONFIG_NETFILTER
+extern int ip6_route_me_harder(struct sk_buff *skb);
 extern unsigned int nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
 				    unsigned int dataoff, u_int8_t protocol);