Glad you got it working; I had missed yeffri's reply.
-- Murphy
On Dec 15, 2011, at 8:26 PM, Kimihiko FUKAMI wrote:
> I am sorry for replying this thread late.
>
> And I sent a reply only to yeffri.
>
> At first, I successed to send an ARP reply in C++. yeffri's code
> helps me very much!
>
> But yeffri's code can send an ARP request, so I wrote the code
> to send an ARP reply. The code is below.
>
> To yeffri and Murphy, thank you very much !!
>
> Kimihiko FUKAMI
>
> === code 1 ===
>
> Disposition Switch::handle(const Event& e){
> const Packet_in_event& pi = assert_cast<const Packet_in_event&>(e);
> uint32_t buffer_id = pi.buffer_id;
> Flow flow(pi.in_port, *pi.get_buffer());
> stringstream out, out2;
> ipaddr ipsrc(ntohl(flow.nw_src));
> ipaddr ipdst(ntohl(flow.nw_dst));
> string tp_src;
> string tp_dst;
> ipaddr globalgwaddr(LB_IP);
> ipaddr privategwaddr(GATEWAY_IP);
>
> if (flow.dl_type == ethernet::ARP){
> Nonowning_buffer b(*pi.get_buffer());
> const arp_eth_header* arp = NULL;
> const eth_header* eth = b.try_pull<eth_header>();
>
> if (b.size() >= ARP_ETH_HEADER_LEN) {
> arp = reinterpret_cast<const
> arp_eth_header*>(b.try_pull(ARP_ETH_HEADER_\
> LEN));
> }else {
> return CONTINUE;
> }
>
> if (arp->ar_op == arp::REQUEST){
> if (ipdst.string() == GATEWAY_IP){
> ethernetaddr senderMAC(arptable[GATEWAY_IP]);
> ethernetaddr targetMAC(flow.dl_src.string().c_str());
>
> sendARPReply(pi.datapath_id, pi.in_port, senderMAC,
> privategwaddr.addr\
> , targetMAC, ipsrc.addr);
> }
> }
>
> =====
>
> sendARPReply function code is below.
>
> ======
> void Switch::sendARPReply(datapathid dpid, int port, ethernetaddr senderMAC,
> u\
> int32_t senderIP, ethernetaddr targetMAC, uint32_t targetIP)
> {
> ethernet ethPacket;
> arp arpPacket;
>
> ethPacket.daddr = targetMAC;
> ethPacket.saddr = senderMAC;
> ethPacket.type = ethernet::ARP;
>
> arpPacket.hrd = arp::ETHER;
> arpPacket.pro = ethernet::IP;
> arpPacket.hln = ethernet::PAYLOAD_MIN; //6 for ethernet
> arpPacket.pln = sizeof(targetIP); //4 for IPV4
> arpPacket.sha = senderMAC;
> arpPacket.sip = senderIP;
> arpPacket.tha = targetMAC;
> arpPacket.tip = targetIP;
> arpPacket.op = arp::REPLY;
>
> int size = sizeof(ethernet) + sizeof(arp);
> uint8_t *data = new uint8_t[size];
>
> memcpy(data, ðPacket, sizeof(ethPacket));
> memcpy(data + sizeof(ethPacket), &arpPacket, sizeof(arpPacket));
> Array_buffer buffer(data,size); // data will be deleted automatically
>
> send_openflow_packet(dpid, buffer, port, OFPP_LOCAL, true); }
> }
>
> === end ===
>
> Murphy McCauley <jam...@nau.edu> wrote:
>
>> First, I'd suggest that you install a flow to send all appropriate ARP
>> messages to the controller.
>>
>> Second, use the packet in event to examine the ARP request. The data that
>> you need is all on the event object (specifically, the "buf" field of the
>> Ofp_msg_event class contains the raw packet data, which you can parse as an
>> ARP request).
>>
>> Third, build an ARP reply based on the request. Send this data using one of
>> the packet sending functions (e.g., send_openflow_packet()).
>>
>>
>> Have you considered writing this as a Python application first?
>>
>>
>> Hope that helps.
>>
>> -- Murphy
>>
>> On Nov 30, 2011, at 12:15 AM, Kimihiko FUKAMI wrote:
>>
>>> Hi,Murphy!
>>>
>>> Thank you for your reply!
>>>
>>> I look at arp.hh source code. But, my question is not addressed.
>>>
>>> I forgot to tell you the code I want to write...
>>>
>>> The code is NAT program. In the NAT, the condition is that arp
>>> reply should be addressed.
>>>
>>> I examined which api to send arp reply by using of Nox(zaku) in
>>> C++, and I get a hint from attached Nox sample code "switch.cc".
>>> The hint is Packet_in_event...
>>>
>>> Then I want to tell you how to get packet data from Packet_in_event
>>> instance. Please give me a hint!
>>>
>>>
>>> Murphy McCauley <jam...@nau.edu> wrote:
>>>
>>>> I don't think I've ever used it, but have you taken a look at
>>>> include/netinet++/arp.hh?
>>>>
>>>> -- Murphy
>>>>
>>>> On Nov 25, 2011, at 1:54 AM, Kimihiko FUKAMI wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> Currently, I can not send an ARP Reply by using of Nox(zaku) in
>>>>> C++ code.
>>>>>
>>>>> # I can write a code to reply ARP in python.
>>>>>
>>>>> So, I want a code sample to send ARP Reply in C++.
>>>>>
>>>>> Please teach me!
>>>>>
>>>>> ---
>>>>> E-mail: fukami.kimih...@lab.ntt.co.jp
>>>>>
>>>>> _______________________________________________
>>>>> nox-dev mailing list
>>>>> nox-dev@noxrepo.org
>>>>> http://noxrepo.org/mailman/listinfo/nox-dev
>>>
>>>
>>> ---
>>> 深見 公彦 (Kimihiko FUKAMI) TEL:0422-59-2475
>>> NTT 情報流通プラットホーム研究所
>>> ネットワークセキュリティプロジェクト
>>> E-mail: fukami.kimih...@lab.ntt.co.jp
>>>
>
>
>
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