Resolvido por OP nos comentários:
I have added the interface peth1 to a class (peth1 is the bridge for eth1. so the traffic goes: vif1.0 --> peth1 --> eth1 --> internet). Then a new filter:
tc filter add dev peth1 parent 1: protocol ip prio 16 u32 match ip src xxx.xxx.xxx.xxx flowid 1:1