Hi All,
I am writing my first non-tutorial controller using Ryu. We are currently
writing a program using a Ryu Controller connected to OvS with openflow 1.5.
During the program an external client sends a packet to OvS which is then
transferred to Ryu for handling. The packet_in interface works fine, the
packet is received and the operation is performed correctly, the problem is
that the controller needs to send a reply packet at the end of the
operation. But when I TCP dump the client computer I don't get the reply
packet, and I am not sure what I did wrong. I am pasting the code for the
reply operation below. (the reply pkt is created in a different function,
and port == in_port of the original request packet that arrived in
packet_in)
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
datapath = ev.msg.datapath
port = ev.msg.match['in_port']
<... some more code ...>
reply_pkt =
self._handle_delete(eth,ip,udp_p,md_udp,md_bin,key)
self._send_reply_packet(datapath,port,reply_pkt)
def _send_reply_packet(self, datapath, port, pkt):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
pkt.serialize()
data = pkt.data
actions = [parser.OFPActionOutput(port=port)]
out = parser.OFPPacketOut(datapath=datapath,
buffer_id=ofproto.OFP_NO_BUFFER,
match=parser.OFPMatch(in_port=ofproto.OFPP_CONTROLLER),
actions=actions,
data=data)
datapath.send_msg(out)
Thanks,
Eyal Cidon
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