On 01/22/2016 01:33 PM, Jason Wang wrote: > > > On 01/20/2016 06:34 PM, Wen Congyang wrote: >> On 01/20/2016 06:03 PM, Jason Wang wrote: >>> >>> On 01/20/2016 05:49 PM, Wen Congyang wrote: >>>> On 01/20/2016 05:20 PM, Jason Wang wrote: >>>>> On 01/20/2016 03:44 PM, Wen Congyang wrote: >>>>>>>> ... >>>>>>>> -chardev socket,id=comparer0,host=ip_primary,port=X,server,nowait >>>>>>>> -chardev socket,id=comparer1,host=ip_primary,port=Y,server,nowait >>>>>>>> -chardev socket,id=mirrorer0,host=ip_primary,port=Z,server,nowait >>>>>>>> -netdev tap,id=hn0 >>>>>>>> -traffic-mirrorer netdev=hn0,id=t0,indev=comparer0,outdev=mirrorer0 >>>>>>>> -colo-comparer primary_traffic=comparer0,secondary_traffic=comparer1 >>>>>>>> ... >>>>>>>> >>>>>>>> packet comparer compares the packets from two chardev: comparer0 and >>>>>>>> comparer1. >>>>>>>> traffic-mirrorer mirror tx to secondary node through chardev mirrorer0, >>>>>>>> and mirror rx to packet comparer through chardev comparer0. >>>>>>>> >>>>>>>> In secondary node: >>>>>>>> >>>>>>>> ... >>>>>>>> -chardev socket,id=redirector0,host=ip_primary,port=Y >>>>>>>> -chardev socket,id=redirector1,host=ip_primary,port=Z >>>>>>>> -netdev tap,id=hn0 >>>>>>>> -traffic-redirector >>>>>>>> netdev=hn0,id,r0,indev=redirector0,outdev=redirector1 >>>>>>>> -colo-rewriter netdev=hn0,id=c0 >>>>>>>> ... >>>>>>>> >>>>>>>> traffic-redirector redirect the rx traffic from primary node through >>>>>>>> redirector0 and redirect the tx traffic to promary node through >>>>>>>> redirector1. >>>>>>>> colo-rewriter rewrite seq number as a normal netfilter. >>>>>> What are traffic-mirrorer and colo-comparer, traffic-redirector, >>>>>> colo-rewriter? >>>>>> A netfilter driver? >>>>> traffic-mirrorer/redirector is a type of netfilter that just >>>>> mirror/redirect packets between netdev and chardev (just the mirror >>>>> client/sever and redirect client/sever in the above graph) >>>>> colo-rewriter is a type of netfilter that did ack/seq adjust (just the >>>>> TCP rewriter in the above graph) >>>>> colo-comparer is a thread object that did packet comparing (similar to >>>>> "compare" in the above graph but not a netfiler) >>>> Thanks. I have another question: >>>> IIRC, both rx and tx packets walk through all netfilter objects in the >>>> same order. >>>> >>>> tx packet(sent to the guest): we want that redirector hanldes it first >>>> rx packet(sent from the guest): we want that colo-rewriter handles it first >>>> Change the order or use two traffic-redirectors? >>>> >>>> Thanks >>>> Wen Congyang >>> Interesting question. >>> >>> Two redirectors sounds ok or maybe we can go through rx filters in a >>> reverse order? >> netdev <---> filter1 <----> filter2 <----> .... <----> emulated device >> <----> guest >> So I think we can go through rx filters in a reverse order. But it changes >> the behavior. So I am not sure if we can do it. > > I think we can. Both dump and buffer filter does not require strict > order, so it's a good time and change to do this.
OK, we will do it. Thanks Wen Congyang > >> >> Thanks >> Wen Congyang >> >>> >>> . >>> >> >> > > > > . >