netfilter: nfmark routing in OUTPUT, mangle, NFQUEUE

This patch let nfmark to be evaluated for routing decision for OUTPUT
packet, in mangle table, when process paquet in NFQUEUE
Until now, only change (in NFQUEUE process) on fields src_addr,
dest_addr and tos could make netfilter to reevalute the routing.

From: Laurent Licour <laurent@licour.com>
Signed-off-by: NEric Leblond <eric@inl.fr>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

net/ipv4/netfilter.c

@@ -125,6 +125,7 @@ struct ip_rt_info {
 	__be32 daddr;
 	__be32 saddr;
 	u_int8_t tos;
+	u_int32_t mark;
 };
 
 static void nf_ip_saveroute(const struct sk_buff *skb,
@@ -138,6 +139,7 @@ static void nf_ip_saveroute(const struct sk_buff *skb,
 		rt_info->tos = iph->tos;
 		rt_info->daddr = iph->daddr;
 		rt_info->saddr = iph->saddr;
+		rt_info->mark = skb->mark;
 	}
 }
 
@@ -150,6 +152,7 @@ static int nf_ip_reroute(struct sk_buff *skb,
 		const struct iphdr *iph = ip_hdr(skb);
 
 		if (!(iph->tos == rt_info->tos
+		      && skb->mark == rt_info->mark
 		      && iph->daddr == rt_info->daddr
 		      && iph->saddr == rt_info->saddr))
 			return ip_route_me_harder(skb, RTN_UNSPEC);