netfilter: nf_flow_table: fix offloading connections with SNAT+DNAT

Pass all NAT types to the flow offload struct, otherwise parts of the
address/port pair do not get translated properly, causing connection
stalls
Signed-off-by: NFelix Fietkau <nbd@nbd.name>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_flow_table_core.c

@@ -84,7 +84,7 @@ flow_offload_alloc(struct nf_conn *ct, struct nf_flow_route *route)
 
 	if (ct->status & IPS_SRC_NAT)
 		flow->flags |= FLOW_OFFLOAD_SNAT;
-	else if (ct->status & IPS_DST_NAT)
+	if (ct->status & IPS_DST_NAT)
 		flow->flags |= FLOW_OFFLOAD_DNAT;
 
 	return flow;