What NOX are you using? Your udp.py does not seem to be the one in zaku or
destiny...
-- Murphy
On Sunday, June 19, 2011 03:34:20 PM Aaron Rosen wrote:
> Hello,
>
> I'm trying to send udp packets from my controller but I'm getting the
> following assertion when I call udp().checksum(). I was hoping someone
> could point out where I'm going wrong.
>
> Thanks,
>
> Aaron
>
> Traceback (most recent call last):
> File "./nox/lib/util.py", line 116, in f
> event.total_len, buffer_id, packet)
> File "./nox/coreapps/examples/sos.py", line 299, in packet_in_callback
> learn(dpid, inport, packet)
> File "./nox/coreapps/examples/sos.py", line 56, in learn
> send_packet = send_udp_message()
> File "./nox/coreapps/examples/sos.py", line 48, in send_udp_message
> l4.csum = l4.checksum()
> File "./nox/lib/packet/udp.py", line 111, in checksum
> assert(isinstance(self.next, packet_base))
> AssertionError
>
>
> def send_udp_message():
>
> l4 = udp()
> l4.srcport = 1999
> l4.dstport = 1888
> l4.len = udp.MIN_LEN + len("hello_world")
> l4.set_payload("Hello_world")
>
> l3 = ipv4()
> l3.iplen = ipv4.MIN_LEN
> l3.protocol = ipv4.UDP_PROTOCOL
> l3.dstip = ipstr_to_int("130.127.39.7");
> l3.srcip = ipstr_to_int("1.1.1.1");
> l3.set_payload(l4)
>
> l2 = ethernet()
> l2.set_payload(l3)
> l2.dst = octstr_to_array("00:00:00:00:00:02")
> l2.dst = octstr_to_array("a1:00:04:00:0a:04")
> l2.type = ethernet.IP_TYPE
> l3.checksum()
> l4.csum = l4.checksum()
>
> return l2
>
>
> ....
> send_packet = send_udp_message()
> inst.send_openflow_packet(dpid, send_packet.tostring(),
> openflow.OFPP_FLOOD, inport)
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