Packet to Upper Layer-Need Suggestion

[karthik karra]

I am receiving the packet,which I needed, at wifi mac layer and need to send to csma net device interface and both are on the same node.

Will it be a good idea to extract the data, form a new packet and send it to upper layer so that I can forward to other interface(CSMA). ?

By searching some of the posts,I got to know that I need to use PacketTags. Am I right ?

Any suggestions would be helpful.

Thanks,
Karra.

[Tommaso Pecorella]

The only thing I can suggest is to explain your problem in a way that can be understood.

Remember that it's your duty to be understood, not viceversa.

Thanks,

T.

[karthik karra]

Hi, (Sorry if it is verbose)

I am having an AccessPoint which has two interfaces 1. WifiMac 2.CsmaNetDevice.

WifiMac interface is connected to Mobile node and CsmaNetDevice is connected to openflow switch.

From mobile node I am receiving the "MGT_ASSOCIATION_REQUEST" header in "Receive" function in "Ap-Wifi-Mac".

Now, I need to extract the data from the above Header and send to Open flow controller via openflow switch.

For this, I need to send the information first to CsmaNetDevice(of AccessPoint) then from there to Openflow Switch.

First I thought that I would be able to send it directly using some methods(even I have tried few and few trail and errors) but didn't work.

Then I had seen the diagram in NS3 website with Two "ForwardUp" functions from WifiMac to WifiNetDevice.

So my idea was, Will I be able to forward the packet(newly formed) by forwarding to WifiNetDevice and from there to IP layer and then using routing to forward it to CsmaNetDevice.

[Tommaso Pecorella]

Hi,

not really. Those messages are "consumed" inside the Wi-Fi part, and are not delivered up.

You can, of course, modify the Wi-Fi module to have a new function called upon association, and use that one to send a message to the other (middle) node.

Hope this helps,

T.

[karthik karra]

I have tried almost the same thing. Defined a new function for which I have passed the WifiMacHeader as parameter which I got in Receive function and I am able to print the Addresses from the header.

Just for experimental purpose I have created a packet in "ap-wifi-mac" and trying it to send to "wifi-net-device" using "ForwardUp" function but I couldn't find any packet getting received.

ostringstream msg;
    msg<<"Hello World!!!"<<"\0";
    Ptr<Packet> pkt = Create<Packet>((uint8_t*)msg.str().c_str(),msg.str().length());
    EthernetHeader header;
    header.SetDestination("00:00:00:00:00:04");
    header.SetSource("00:00:00:00:00:02");
    pkt->AddHeader(header);
    this->ForwardUp(pkt,"00:00:00:00:00:02","00:00:00:00:00:04");

The above piece of code in ApWifiMac::CsmaNet(WifiMacHeader hdr)

[Tommaso Pecorella]

You can't use ForwardUp. Use some logic, if you use THAT function, the packet will go to the L3 - and you're lucky that it didn't crash anything.

T.

[karthik karra]

Ok. From L3 can I forward it to CsmaNetDevice interface as it has an IP Address associated to it.
Or the Idea is itself totally wrong.

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