I've also tried this which yields the same results:
if packet.next.protocol == 0x4:
print "UNENCAPED1 "
packet.next = packet.next.next
self.send_openflow_packet(dpid, packet.arr,openflow.OFPP_FLOOD ,
inport)
self.send_openflow_packet(dpid,
packet.tostring(),openflow.OFPP_FLOOD , inport)
On Sat, Mar 5, 2011 at 10:38 PM, Aaron Rosen <[email protected]> wrote:
> Hey Guys I have one more question:
>
> I'm receiving IPIP packets and I want to unencapsulate them. I'm receiving
> these packets as packet_ins and I have the follow code to handle this:
>
> if packet.next.protocol == 0x4:
> print "UNENCAPED1 "
> packet.next = packet.next.next
> self.send_openflow_packet(dpid, packet.tostring(),
> openflow.OFPP_FLOOD)
> print "UNENCAPED2 "
> return CONTINUE
>
>
> In NOX I see:
>
> UNENCAPED1
> UNENCAPED2
>
> But in wireshark a packet_out event is never generated.
>
> Any idea whats going wrong here? (attached is one of the packet_in events
> that I'm receiving I'm not sure it will be helpful). I've also changed the
> follow code so that my controller receives the full packet from a packet_in
> event.)
>
>
> diff --git a/src/lib/openflow.cc b/src/lib/openflow.cc
> index e23cb20..9b5a023 100644
> --- a/src/lib/openflow.cc
> +++ b/src/lib/openflow.cc
> @@ -598,7 +598,7 @@ int Openflow_connection::send_
> switch_config() {
> osc.header.length = htons(sizeof osc);
> osc.header.xid = openflow_pack::get_xid();
> osc.flags = 0;
> - osc.miss_send_len = htons(OFP_DEFAULT_MISS_SEND_LEN);
> + osc.miss_send_len = htons(UINT16_MAX);
>
> return send_openflow(&osc.header, false);
>
>
> Thanks,
>
> Aaron
>
>
> On Tue, Mar 1, 2011 at 7:50 PM, James "Murphy" McCauley <[email protected]>wrote:
>
>> You CAN change how much of the packet gets forwarded from a miss, but
>> this is done in the switch negotiation and there's no really clean way
>> to change it (it's a macro in one of the openflow headers). You're
>> better off installing a flow.
>>
>> In that case, if you're not manipulating the packets at all (it doesn't
>> seem like you are), you can also then generally send them back out by
>> buffer id, and not actually have to send the full packet both ways
>> to/from the controller. Also, if you just want to spy on traffic and
>> not alter it, you could set an action to flood the packet as well as the
>> action to send it to the controller.
>>
>> -- Murphy
>>
>> On Tue, 2011-03-01 at 19:36 -0500, Aaron Rosen wrote:
>> > 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
>> > <[email protected]> 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
>> > <[email protected]> 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
>> > <[email protected]>
>> > > >> 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
>> > > >> <[email protected]> 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
>> > > >> > <[email protected]> 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
>> > > >> > > [email protected]
>> > > >> > >
>> > > >>
>> > 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
>> >
>>
>>
>>
>
>
> --
> 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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