Hello,
I am trying to modify the existing example script to generate a packet
out for every packet-in. My requirement is to send a packet out message to
the switch with the Packet-Out payload containing a 802.1Q VLAN tag of the
controller VID. In other words, irrespective of what packet was sent in the
packet-in message i send this crafted packet in the packet-out with all
hard coded packet fields. Following is the handler function:
* @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER) def
packet_in_handler(self, ev): msg = ev.msg dp =
msg.datapath ofp = dp.ofproto ofp_parser = dp.ofproto_parser*
* /* Construct payload packet */*
* e =
ethernet.ethernet(DST_MAC_ADDRESS,
SRC_MAC_ADDRESS, ether.ETH_TYPE_IP) ip
= ipv4.ipv4(4, header_length, tos, total_length,
identification, 0, 0, IPV4_TTL, inet.IPPROTO_UDP,
0, primary_ip_address, IPV4_DST_ADDRESS) p
= packet.Packet() p.add_protocol(e) if vlan_id is not
None: vlan_ = vlan.vlan(0, 0, vlan_id, e.ethertype)
e.ethertype = ether.ETH_TYPE_8021Q p.add_protocol(vlan_)
p.add_protocol(ip)*
* /* HOW DO I ASSOCIATE Packet 'p' TO THE PKT-OUT PAYLOAD HERE? */*
* actions = [ofp_parser.OFPActionOutput(ofp.OFPP_FLOOD)] out
= ofp_parser.OFPPacketOut( datapath=dp, buffer_id=msg.buffer_id,
in_port=msg.in_port, actions=actions) dp.send_msg(out)*
However i am unable to figure out how to associate the crafted packet (p)
to the packet-out payload. I am newbie to python/RYU programming. Please
help.
Thanks,
Nitish
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