I believe if you do ipstr_to_int("10.0.0.3") it should work.
Aaron
On Wed, Apr 25, 2012 at 6:37 PM, Weiyang Mo <[email protected]> wrote:
> Hi,
>
> I tested the code and view the packets in Wireshark. For ETH packets, it
> works. For IPV4, some errors when I complie it.
>
> (1) I tried ETH packets and the host can receive the packets.
> eth_packet= ethernet()
> eth_packet.set_payload(str("hello"))
> eth_packet.dst = packet.dst
> eth_packet.src = packet.src
> eth_packet.type = ethenet.IP_TYPE
>
> self.send_openflow_packet(dpid,eth_packet.tostring(),inport)
>
> (2) I tried IPV4 and this time an error " "H" format requires
> <=number<=65535 " , here's the following code
>
> ipv4_packet = ipv4()
> payload = str("hello")
> ipv4_packet.iplen = ipv4.MIN_LEN + len(payload)
> ipv4_packet.set_payload(payload)
> ipv4_packet.dstip = str("10.0.0.3")
> ipv4_packet.srcip = str("192.168.56.102")
>
> eth_packet= ethernet()
> eth_packet.set_payload(ipv4_packet)
> packet.dst = packet.dst
> eth_packet.src = packet.src
> eth_packet.type = ethenet.IP_TYPE
> ipv4_packet.csum = ipv4_packet.checksum()
>
> self.send_openflow_packet(dpid,ipv4_packet.tostring(),inport)
>
> I guess why it is failed maybe due to such line ipv4_packet.dstip
> = str("10.0.0.3") is not acceptable. Or other reasons?
>
> Thanks very much.
>
> Weiyang
>
>
>
>
> 2012/4/25 Aaron Rosen <[email protected]>
>>
>> Hi Weiyang,
>>
>> You can inject packets from the controller into the switch like this.
>> Here is some code that I've used to send UDP packets from the
>> controller to hosts.
>>
>> Aaron
>>
>> def send_udp(mac, dstip, srcip, port, payload):
>> l4 = udp()
>> l4.srcport = port
>> l4.dstport = AGENT_MESSAGE_PORT
>> l4.len = udp.MIN_LEN + len(payload)
>> l4.set_payload(payload)
>> l4.arr = l4.tostring()
>> l3 = ipv4()
>> l3.iplen = ipv4.MIN_LEN + l4.len
>> l3.protocol = ipv4.UDP_PROTOCOL
>> l3.dstip = dstip
>> l3.srcip = srcip
>> l3.set_payload(l4)
>> l2 = ethernet()
>> l2.set_payload(l3)
>> l2.dst = mac
>> l2.src = octstr_to_array(CONTROLLER_MAC)
>> l2.type = ethernet.IP_TYPE
>> l4.csum = l4.checksum()
>> return l2
>>
>>
>> inform_dest = send_udp(mac, dstip, srcip, port, payload)
>> inst.send_openflow_packet(HA, inform_dest.tostring(),
>> inst.Agent[HA]['inport'], openflow.OFPP_NONE)
>>
>>
>> On Wed, Apr 25, 2012 at 3:02 PM, Weiyang Mo <[email protected]>
>> wrote:
>> > Thanks very much for your quick reply.
>> >
>> > But I am still confused. do you mean that "the controller instruct a
>> > switch
>> > to send a packet" is not an OpenFlow feature? Or I misunderstand what
>> > you
>> > mean.
>> >
>> > I am sending packets from a client to a server through multiple OpenFlow
>> > switches. I already have this functionality that the controller inserts
>> > flow-entries and then the packets can be sent to the server.
>> >
>> > Now, I want to have another action that " when the controller receives
>> > the
>> > first packet-in message, it can instruct a switch to send a packet which
>> > contains some data(e.g, hello). And this new packet can be sent to
>> > another
>> > host. If so, the host can run other applications automatically upon
>> > receving
>> > the packet "hello".
>> >
>> > Is it possible?( Packet in->controller controller-> instrucrt the
>> > switch to create a new packet new packet(Hello) ->host). How should
>> > I
>> > write the pseudo code.
>> >
>> > Thanks
>> >
>> > Weiyang
>> >
>> > 2012/4/25 Murphy McCauley <[email protected]>
>> >>
>> >> There are no examples of this because this is not an OpenFlow feature
>> >> --
>> >> only the controller can instruct a switch to send a packet.
>> >>
>> >> Unless maybe there is some vendor extension for some switches…
>> >>
>> >> -- Murphy
>> >>
>> >> On Apr 25, 2012, at 11:28 AM, Weiyang Mo wrote:
>> >>
>> >> BTW,any example code for this? For instance, the controller wishes to
>> >> send
>> >> a packet which contains the data "Hello" through the switch to the
>> >> Output.
>> >>
>> >> How should I write the code? Is it like
>> >> "actions=[openflow.ofp_packet_out,
>> >> ...]" ?
>> >>
>> >> I am not clear because I don't find sample codes. Could anyone
>> >> provides a
>> >> simple sample code?
>> >>
>> >> Regards
>> >>
>> >> Weiyang
>> >> ---------- Forwarded message ----------
>> >> From: Weiyang Mo <[email protected]>
>> >> Date: 2012/4/25
>> >> Subject: instruct the swtich to create a new packet.
>> >> To: [email protected]
>> >>
>> >>
>> >> Hi,all,
>> >>
>> >> I want to insert an action in to flow entry. The action can tell the
>> >> switch to create a new arbitary packet. What command should I use?
>> >>
>> >> Thanks a lot
>> >>
>> >> Weiyang
>> >>
>> >>
>> >
>>
>>
>>
>> --
>> Aaron O. Rosen
>> Masters Student - Network Communication
>> 306B Fluor Daniel
>
>
--
Aaron O. Rosen
Masters Student - Network Communication
306B Fluor Daniel
