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 <jam...@nau.edu>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
> > <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
> >
>
>
>
--
Aaron O. Rosen
Masters Student - Network Communication
306B Fluor Daniel
843.425.9777
err.pcap
Description: application/cap
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