Hi,
I have a python component and want to create an udp packet in the
controller and send it out via "self.send_openflow_packet(dpid,
packet.tostring(), outport)"
First of all: a small bugfix is needed:
nox/src/nox/lib/packet/packet_base.py needs an "import array". Without
that, the set_payload function raises an exception as it does not find
array.array.
Now I create my packet the following way:
from nox.lib.packet.udp import udp
from nox.lib.packet.ipv4 import ipv4
from nox.lib.packet.ethernet import ethernet
udp_packet = udp()
udp_packet.srcport = 12345
udp_packet.dstport = 4711
rand = random.random()
udp_packet.set_payload(str(rand))
udp_packet.csum = udp_packet.checksum()
ipv4_packet = ipv4()
ipv4_packet.set_payload(udp_packet)
ipv4_packet.srcip = ipstr_to_int(CONTROLLER_IP)
ipv4_packet.dstip = ipstr_to_int(CONTROLLER_IP)
ipv4_packet.csum = ipv4_packet.checksum()
eth_packet = ethernet()
eth_packet.src = CONTROLLER_MAC
eth_packet.dst = CONTROLLER_MAC
eth_packet.set_payload(ipv4_packet)
eth_packet.type = ethernet.IP_TYPE
and send this then via self.send_openflow_packet
The packet goes out the link and is forwarded (via a flow on another
switch) back to the controller where I can see it in my packet_in handler.
The only problem is: the packet only consists of the link layer
(ethernet type) header and the ipv4 type header. The payload of the ipv4
packet (which should be my udp header and the payload) is completely
missing. From the ipv4 class, the ipv4.next is None and I can also
verify with wireshark that the packet that is transmitted from the
controller to the switch encapsuled in an OpenFlow packet, consists only
of the ethernet header and the ipv4 header.
Am I missing something? Where is this going wrong?
I tried to look at the send_openflow_packet function. It seems to
somehow call self.ctxt.send_openflow_packet_port in
nox/src/nox/lib/core.py which I could not find?!
I am not into Swig and all that stuff, so I am stuck here :(
Any help is greatly appreciated!
Best regards
Bernd
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