The controller can get as much of the packet as it wants. The number of bytes to send is an operand of the action that sends a packet to the controller.
Of course it's doable in OVS--but it's going to be more work and you'll have to understand OVS internals instead of OpenFlow. On Fri, Jun 05, 2020 at 07:47:56PM +0000, Luca Mancini wrote: > Hi Ben, > I thought controllers didn’t have access to the complete packet but just the > (packet_in msgs), so I was told to implement this in the switches and use the > controller just as the “brain”. > I’d much rather work on a controller to be honest, however, do you not think > its doable at all in OVS? > > Cheers, > > Luca > > From: Ben Pfaff<mailto:b...@ovn.org> > Sent: Friday, June 5, 2020 21:32 > To: Luca Mancini<mailto:luca.manc...@outlook.com> > Cc: Gregory Rose<mailto:gvrose8...@gmail.com>; > ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org> > Subject: Re: [ovs-discuss] DP_Packet Payload Modification > > On Fri, Jun 05, 2020 at 05:56:54PM +0000, Luca Mancini wrote: > > Basically, I’m implementing a custom action which is meant to buffer > > an x amount of dp_packets that match a certain flow, and then send a > > new packet directly from the switch, containing the buffer of packets, > > as its payload. At some other switch this payload is then meant to be > > extracted so that I can retrieve the buffer of dp_packets and send the > > single packets contained in the buffer to the correct hosts. > > > > My action is implemented in userspace only for now since efficiency > > isn’t a concern for me atm. I already implemented the buffering > > mechanism and it works, and now I’m trying to create this custom udp > > packet so that I can store the buffer in it. For now I’m only trying > > to create a dummy udp packet with a “hello world” string as its > > payload just to see if I can create this custom packet however I just > > can’t figure out what I’m missing. My most recent attempt is the > > following > > I'd use a local controller for this. Then you don't have to implement > anything in OVS at all. > _______________________________________________ discuss mailing list disc...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-discuss
