These packets are from non-matches. So I guess I'm only getting 128Bytes of
the packet from this? I guess I should install a rule that sends this
packets to the controller if I want the full packet.
Thanks,
Aaron
On Tue, Mar 1, 2011 at 7:28 PM, James "Murphy" McCauley <jam...@nau.edu>wrote:
> I didn't just add the "+ str(self.type)". I also switched it to a print
> from a call to self.msg() (which doesn't exist because the TCP option
> class isn't a subclass of the main packet class). You should do this.
>
> BUT... now I am suspicious. How are you getting these packets? Are
> they from non-matches, or did you install a flow with a
> send-to-controller action? In the former case, the packet is almost
> surely truncated because only 128 bytes of a packet from a miss are sent
> by default. In the latter, are you sure you specified a large enough
> size when installing the flow?
>
> -- Murphy
>
> On Tue, 2011-03-01 at 19:18 -0500, Aaron Rosen wrote:
> > If I pass packet.arr that still doesn't work. I don't get an Error
> > message but tcpdump says:
> >
> > 19:16:26.829891 IP truncated-ip - 730 bytes missing!
> > 130.127.39.173.58832 > 130.127.39.235.ssh: P
> > 2569410772:2569411564(792) ack 3106665167 win 12 <nop,nop,timestamp
> > 10172901 47037426>
> >
> > Also adding that +str(self.type) their doesn't seem to print out the
> > type at that point.
> >
> >
> > 00132|pyrt|ERR:unable to invoke a Python event handler:
> > Traceback (most recent call last):
> > File "./nox/lib/util.py", line 113, in f
> > event.total_len, buffer_id, packet)
> > File "./nox/coreapps/examples/aaronswitch.py", line 182, in
> packet_in_callback
> > self.forward(dpid, inport, packet, packet.arr, bufid)
> > File "./nox/coreapps/examples/aaronswitch.py", line 67, in forward
> > self.send_openflow_packet(dpid,
> > packet.tostring(),openflow.OFPP_FLOOD , inport)
> > File "./nox/lib/packet/packet_base.py", line 114, in tostring
> > return ''.join((buf, self.next.tostring()))
> > File "./nox/lib/packet/packet_base.py", line 114, in tostring
> > return ''.join((buf, self.next.tostring()))
> > File "./nox/lib/packet/packet_base.py", line 109, in tostring
> > buf = self.hdr()
> > File "./nox/lib/packet/tcp.py", line 215, in hdr
> > packet += option.to_bytes()
> > File "./nox/lib/packet/tcp.py", line 78, in to_bytes
> > self.msg('(tcp_opt to_bytes) warning, unknown option') +
> str(self.type)
> > AttributeError: tcp_opt instance has no attribute 'msg'
> >
> >
> >
> > On Tue, Mar 1, 2011 at 6:48 PM, James "Murphy" McCauley <jam...@nau.edu>
> wrote:
> > > Yeah, that's a bug too.
> > >
> > > Change line 78 in tcp.py to like...
> > > print '(tcp_opt to_bytes) warning, unknown option type ' +
> > > str(self.type)
> > >
> > > .. I'd actually be interested in knowing which option it is, because
> > > maybe we should be handling it.
> > >
> > > You could also probably pass packet.arr instead of packet.tostring()
> > > which would get around the fact that the parsing library has not been
> > > extensively tested for packet assembly (mostly it's used for parsing).
> > >
> > > -- Murphy
> > >
> > > On Tue, 2011-03-01 at 18:21 -0500, Aaron Rosen wrote:
> > >> Oh Nox is also telling me this:
> > >>
> > >> Traceback (most recent call last):
> > >> File "./nox/lib/util.py", line 113, in f
> > >> event.total_len, buffer_id, packet)
> > >> File "./nox/coreapps/examples/aaronswitch.py", line 182, in
> > >> packet_in_callback
> > >> self.forward(dpid, inport, packet, packet.arr, bufid)
> > >> File "./nox/coreapps/examples/aaronswitch.py", line 67, in forward
> > >> self.send_openflow_packet(dpid,
> > >> packet.tostring(),openflow.OFPP_FLOOD , inport)
> > >> File "./nox/lib/packet/packet_base.py", line 114, in tostring
> > >> return ''.join((buf, self.next.tostring()))
> > >> File "./nox/lib/packet/packet_base.py", line 114, in tostring
> > >> return ''.join((buf, self.next.tostring()))
> > >> File "./nox/lib/packet/packet_base.py", line 109, in tostring
> > >> buf = self.hdr()
> > >> File "./nox/lib/packet/tcp.py", line 215, in hdr
> > >> packet += option.to_bytes()
> > >> File "./nox/lib/packet/tcp.py", line 78, in to_bytes
> > >> self.msg('(tcp_opt to_bytes) warning, unknown option')
> > >> AttributeError: tcp_opt instance has no attribute 'msg'
> > >>
> > >>
> > >>
> > >>
> > >> On Tue, Mar 1, 2011 at 6:18 PM, Aaron Rosen <aro...@clemson.edu>
> > >> wrote:
> > >> Thanks Murphy that fixes the typeerror but I'm still not sure
> > >> if the packets are correct because I'm not able to make a
> > >> connection. In Wireshark for this ssh packet_in's it's saying
> > >> "This frame is a suspected retransmission" and in tcpdump at
> > >> the host that is getting these packets its saying:
> > >>
> > >>
> > >> 18:13:48.227362 IP truncated-ip - 730 bytes missing!
> > >> 130.127.39.173.59276 > 130.127.39.235.ssh: P 40:832(792) ack
> > >> 33 win 12 <nop,nop,timestamp 9797038 46103242>
> > >>
> > >>
> > >> Thanks,
> > >>
> > >> Aaron
> > >>
> > >>
> > >>
> > >>
> > >> On Tue, Mar 1, 2011 at 5:39 PM, James "Murphy" McCauley
> > >> <jam...@nau.edu> wrote:
> > >> Looks like the problem is in the parsing. Here's a
> > >> patch:
> > >>
> > >> --- a/src/nox/lib/packet/tcp.py
> > >> +++ b/src/nox/lib/packet/tcp.py
> > >> @@ -150,7 +150,7 @@ class tcp(packet_base):
> > >> elif arr[i] == tcp_opt.MSS:
> > >> if arr[i+1] != 4:
> > >> raise Exception()
> > >> - val = struct.unpack('!H',arr[i+2:i
> > >> +4])
> > >> + val = struct.unpack('!H',arr[i+2:i
> > >> +4])[0]
> > >>
> > >> self.options.append(tcp_opt(tcp_opt.MSS,val))
> > >> elif arr[i] == tcp_opt.WSOPT:
> > >> if arr[i+1] != 3:
> > >>
> > >> -- Murphy
> > >>
> > >>
> > >> On Tue, 2011-03-01 at 17:29 -0500, Aaron Rosen wrote:
> > >> > Hi Murphy,
> > >> >
> > >> > I'm just trying to connect to a computer using ssh
> > >> so when I do ssh
> > >> > 130.127.39.235 I see these typeerror messages. I do
> > >> not to anything
> > >> > with the packet when it gets to the controller
> > >> except tell it to
> > >> > flood.
> > >> >
> > >> > The MSS of these packets are 1460 in the packet_in
> > >> event.
> > >> >
> > >> > Any idea?
> > >> >
> > >> > Thanks,
> > >> >
> > >> > Aaron
> > >> >
> > >> >
> > >> > On Tue, Mar 1, 2011 at 3:51 PM, James "Murphy"
> > >> McCauley
> > >> > <jam...@nau.edu> wrote:
> > >> > You're not doing anything wrong here. You
> > >> seem to be doing
> > >> > something
> > >> > wrong elsewhere. Specifically, you seem to
> > >> have constructed
> > >> > an MSS TCP
> > >> > option with a tuple as its value, when the
> > >> value should be
> > >> > some sort of
> > >> > integer.
> > >> >
> > >> > -- Murphy
> > >> >
> > >> >
> > >> > On Tue, 2011-03-01 at 15:22 -0500, Aaron
> > >> Rosen wrote:
> > >> > > Hello I was wondering if someone could
> > >> explain where I'm
> > >> > going wrong
> > >> > > here:
> > >> > > I'm receiving a packet and then trying to
> > >> send it back out
> > >> > with
> > >> > >
> > >> > > self.send_openflow_packet(dpid,
> > >> > > packet.tostring(),openflow.OFPP_FLOOD ,
> > >> inport)
> > >> > >
> > >> > > When I do this I'm getting the following
> > >> exception:
> > >> > >
> > >> > > 00290|pyrt|ERR:unable to invoke a Python
> > >> event handler:
> > >> > > Traceback (most recent call last):
> > >> > > File "./nox/lib/util.py", line 113, in f
> > >> > > event.total_len, buffer_id, packet)
> > >> > > File
> > >> "./nox/coreapps/examples/aaronswitch.py", line 177,
> > >> > in
> > >> > > packet_in_callback
> > >> > > self.forward(dpid, inport, packet,
> > >> packet.arr, bufid)
> > >> > > File
> > >> "./nox/coreapps/examples/aaronswitch.py", line 96, in
> > >> > forward
> > >> > > self.send_openflow_packet(dpid,
> > >> > > packet.tostring(),openflow.OFPP_FLOOD ,
> > >> inport)
> > >> > > File "./nox/lib/packet/packet_base.py",
> > >> line 114, in
> > >> > tostring
> > >> > > return ''.join((buf,
> > >> self.next.tostring()))
> > >> > > File "./nox/lib/packet/packet_base.py",
> > >> line 114, in
> > >> > tostring
> > >> > > return ''.join((buf,
> > >> self.next.tostring()))
> > >> > > File "./nox/lib/packet/packet_base.py",
> > >> line 109, in
> > >> > tostring
> > >> > > buf = self.hdr()
> > >> > > File "./nox/lib/packet/tcp.py", line
> > >> 215, in hdr
> > >> > > packet += option.to_bytes()
> > >> > > File "./nox/lib/packet/tcp.py", line 70,
> > >> in to_bytes
> > >> > > return struct.pack('!
> > >> BBH',self.type,4,self.val)
> > >> > > TypeError: unsupported operand type(s) for
> > >> &: 'tuple' and
> > >> > 'long'
> > >> > >
> > >> > > Thanks,
> > >> > >
> > >> > > Aaron
> > >> > >
> > >> > >
> > >> > > --
> > >> > > Aaron O. Rosen
> > >> > > Masters Student - Network Communication
> > >> > > 306B Fluor Daniel
> > >> > > 843.425.9777
> > >> > >
> > >> >
> > >> > >
> > >> _______________________________________________
> > >> > > nox-dev mailing list
> > >> > > nox-dev@noxrepo.org
> > >> > >
> > >>
> http://noxrepo.org/mailman/listinfo/nox-dev_noxrepo.org
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> > --
> > >> > Aaron O. Rosen
> > >> > Masters Student - Network Communication
> > >> > 306B Fluor Daniel
> > >> > 843.425.9777
> > >> >
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >> --
> > >>
> > >> Aaron O. Rosen
> > >> Masters Student - Network Communication
> > >> 306B Fluor Daniel
> > >> 843.425.9777
> > >>
> > >>
> > >>
> > >>
> > >>
> > >> --
> > >> Aaron O. Rosen
> > >> Masters Student - Network Communication
> > >> 306B Fluor Daniel
> > >> 843.425.9777
> > >>
> > >
> > >
> > >
> >
> >
> >
>
>
>
--
Aaron O. Rosen
Masters Student - Network Communication
306B Fluor Daniel
843.425.9777
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