Unfortunately, your tweak breaks the logic of the assert.
The assert is asserting that self.next is a packet_base of some sort OR a
string. You've set it to a string, so... it should be a string. So it should
definitely not be a packet_base. So the first of your asserts will always
fail.
For the sake of testing, would you please comment out the first of your two
asserts (leaving only the one against type('')), and let me know the result?
-- Murphy
On Monday, June 20, 2011 09:22:23 AM Aaron Rosen wrote:
> Hi Murphy,
>
> I'm using zaku but the one in destiny looked the same to be.
>
> I changed to assert to be on two lines so I could see which one was firing.
>
> def checksum(self):
> #assert(isinstance(self.next, packet_base) or type(self.next)
> == type(''))
> assert(isinstance(self.next, packet_base))
> assert(type(self.next) == type(''))
>
>
> Thanks,
>
> Aaron
>
> On Mon, Jun 20, 2011 at 12:19 PM, Murphy McCauley <jam...@nau.edu> wrote:
> > 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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