Thanks,
I hate to bug you again but this looks fine to me?
iplen = 39 len("hello world")(11) + udp header(8) + 20 (ip_header)
17 = UDP_PROTOCOL
bad packet [69, 0, 39, 1312840938, 0, 64, 17, 0, 167837954, 167837953]
00019|pyrt|ERR:unable to invoke a Python event handler:
Traceback (most recent call last):
File "./nox/lib/util.py", line 114, in f
event.total_len, buffer_id, packet)
File "./nox/coreapps/examples/sos.py", line 644, in packet_in_callback
learn(dpid, inport, packet, packet.arr, bufid)
File "./nox/coreapps/examples/sos.py", line 212, in learn
forward(dpid, inport, packet, packet.arr, bufid, TRUNK_PORT)
File "./nox/coreapps/examples/sos.py", line 333, in forward
ret = install_agent_flows(dpid, inport, packet, buf, bufid, TRUNK_PORT);
File "./nox/coreapps/examples/sos.py", line 594, in install_agent_flows
inst.send_openflow_packet(dp_near, inform_dest.tostring(),
inst.Agents[dp_near]['inport'], inport)
File "./nox/lib/packet/packet_base.py", line 118, in tostring
return ''.join((buf, self.next.tostring()))
File "./nox/lib/packet/packet_base.py", line 113, in tostring
buf = self.hdr()
File "./nox/lib/packet/ipv4.py", line 179, in hdr
self.dstip)
error: 'H' format requires 0 <= number <= 65535
On Mon, Aug 8, 2011 at 5:32 PM, Murphy McCauley <jam...@nau.edu> wrote:
> I think you just have a field with a bad value.
>
> Try replacing the checksum function with something like this to help you
> spot it:
>
> def checksum(self):
> try:
> data = struct.pack('!BBHHBBHII', (self.v << 4) + self.hl, self.tos,
> self.iplen, self.id,
> (self.flags << 13) | self.frag, self.ttl,
> self.protocol, 0, self.srcip,
> self.dstip)
> return checksum(data, 0)
> except:
> print "bad packet",[(self.v << 4) + self.hl,
> self.tos,
> self.iplen, self.id,
> (self.flags << 13) | self.frag, self.ttl,
> self.protocol, 0, self.srcip,
> self.dstip]
>
> -- Murphy
>
> On Aug 8, 2011, at 1:50 PM, Aaron Rosen wrote:
>
> Hello,
>
> I emailed the mailing list about this before but it seems like maybe
> something changed or maybe I'm blind. Anyways, the following code generates
> the following execption. Any ideas what's going wrong?
>
>
> def send_udp(mac, dstip, srcip, port, payload):
> l4 = udp()
> l4.srcport = 1999
> l4.dstport = 1998
> l4.len = udp.MIN_LEN + len("hello world")
> l4.set_payload("hello world")
> l4.arr = l4.tostring()
>
> l3 = ipv4()
> l3.iplen = ipv4.MIN_LEN + l4.len
> l3.protocol = ipv4.UDP_PROTOCOL
> l3.dstip = ipstr_to_int("10.1.1.1")
> l3.srcip = ipstr_to_int("10.1.1.2")
> l3.set_payload(l4)
>
> l2 = ethernet()
> l2.set_payload(l3)
> l2.dst = octstr_to_array("00:00:00:00:00:01")
> l2.src = octstr_to_array("00:00:00:00:00:09")
> l2.type = ethernet.IP_TYPE
> l3.checksum()
> l4.csum = l4.checksum()
> return l2
>
>
> 00019|pyrt|ERR:unable to invoke a Python event handler:
> Traceback (most recent call last):
> File "./nox/lib/util.py", line 114, in f
> event.total_len, buffer_id, packet)
> File "./nox/coreapps/examples/sos.py", line 626, in packet_in_callback
> learn(dpid, inport, packet, packet.arr, bufid)
> File "./nox/coreapps/examples/sos.py", line 194, in learn
> forward(dpid, inport, packet, packet.arr, bufid, TRUNK_PORT)
> File "./nox/coreapps/examples/sos.py", line 315, in forward
> ret = install_agent_flows(dpid, inport, packet, buf, bufid,
> TRUNK_PORT);
> File "./nox/coreapps/examples/sos.py", line 575, in install_agent_flows
> inform_dest = send_udp(mac, dstip, srcip, port, payload)
> File "./nox/coreapps/examples/sos.py", line 89, in send_udp
> l3.checksum()
> File "./nox/lib/packet/ipv4.py", line 162, in checksum
> self.dstip)
> error: 'H' format requires 0 <= number <= 65535
>
>
> On Mon, Jun 20, 2011 at 1:59 PM, Aaron Rosen <aro...@clemson.edu> wrote:
>
>> Thanks Murphy!
>>
>> You're right, that did the trick.
>>
>> Aaron
>>
>> On Mon, Jun 20, 2011 at 1:55 PM, Murphy McCauley <jam...@nau.edu> wrote:
>> > So I think the call to l3.checksum() is extraneous, but the real issue
>> is
>> > probably that l3.iplen should be ipv4.MIN_LEN + l4.len.
>> >
>> > -- Murphy
>> >
>> > On Monday, June 20, 2011 09:42:07 AM Aaron Rosen wrote:
>> >> Hi Murphy,
>> >>
>> >> wow... Opps...
>> >>
>> >> I'm trying the following: This doesn't return any errors but in
>> >> wireshark the packet_outs say Malformed UDP packets.
>> >>
>> >> 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")
>> >> l4.arr = l4.tostring()
>> >>
>> >> 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
>> >>
>> >> ....
>> >> inst.send_openflow_packet(dpid, send_udp_message().tostring(),
>> >> openflow.OFPP_FLOOD, inport)
>> >> source = mac_to_str(packet.src)
>> >>
>> >> On Mon, Jun 20, 2011 at 12:29 PM, Murphy McCauley <jam...@nau.edu>
>> wrote:
>> >> > 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)
>> >
>>
>>
>>
>> --
>> Aaron O. Rosen
>> Masters Student - Network Communication
>> 306B Fluor Daniel
>>
>
>
>
> --
> Aaron O. Rosen
> Masters Student - Network Communication
> 306B Fluor Daniel
>
>
>
>
--
Aaron O. Rosen
Masters Student - Network Communication
306B Fluor Daniel
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