[pox-dev] ARP request

[Muhammad Furqan Gagan]

I have implemented this code to handle ARP.. is it ok ? I am not sure about that.. need your comments please

        a= packet.find('arp')
        if a:
            if a.prototype == arp.PROTO_TYPE_IP:
                if a.hwtype == arp.HW_TYPE_ETHERNET:
                    if a.protosrc != 0:
                        if a.protosrc in arp_tale:
                            if a.hwsrc == True:
                                Mac = EthAddr(a.hwsrc)
                                arp_table[a.protosrc] = Mac:

              
            if a.opcode == arp.REQUEST:
            # Maybe we can answer

            if a.protodst in arp_table:
                r = arp()
                r.hwtype = a.hwtype
                r.prototype = a.prototype
                r.hwlen = a.hwlen
                r.protolen = a.protolen
                r.opcode = arp.REPLY
                r.hwdst = a.hwsrc
                r.protodst = a.protosrc
                r.protosrc = a.protodst
                Mac = arp_table[a.protodst]
                
                Mac = _dpid_to_mac(dpid)
                r.hwsrc = Mac
                e = ethernet(type=packet.type, src=_dpid_to_mac(dpid),
                dst=a.hwsrc)
                e.payload = r
                log.info("%s answering ARP for %s" % (dpid_to_str(dpid),
                str(r.protosrc)))
                msg = of.ofp_packet_out()
                msg.data = e.pack()
                msg.actions.append(of.ofp_action_output(port =
                                                          of.OFPP_IN_PORT))
                msg.in_port = inport
                event.connection.send(msg)
                     
            else:
                msg = of.ofp_packet_out()
                msg.actions.append(of.ofp_action_output(port = of.OFPP_FLOOD))
                msg.data = event.ofp
                event.connection.send(msg.pack())

Thanks

Muhammad

On Nov 13, 2013, at 12:56 PM, Murphy McCauley <murphy.mccauley at gmail.com> wrote:

> Durga is spot on, but I'll throw in another couple things you might look at:
> forwarding.l3_learning handles ARP
> proto.arp_helper attempts to make it easier to work with ARP
> 
> (Oh, and misc.arp_responder has moved to proto.arp_responder in newer versions.)
> 
> -- Murphy
> 
> On Nov 13, 2013, at 2:06 AM, durga <c.vijaya.durga at gmail.com> wrote:
> 
>> 
>> hello,
>> Seems pox supports packet type as arp, can be found here (pox / pox / lib / packet / arp.py ), as well as may be you can get some help by refering to the below example.
>>  pox / pox / misc / arp_responder.py 
>> 
>> Cheers!
>> Durga
>> 
>> 
>> 
>> On Wed, Nov 13, 2013 at 8:35 PM, Muhammad Furqan Gagan <furqan.gagan at gmail.com> wrote:
>> Hello,
>> 
>> Any one know how to handle ARP request in controller?
>> 
>> Thanks
>> 
>> Muhammad
>> 
> 

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