Finding the Sender's IP Address of Every Frame Received at the MAC-Level

Hello there,

I have been using IPW2200 for my testbed experiments, and for this
purpose I downloaded, compiled and installed the latest important
modules of ieee80211 and the relevant driver module. I have got
around with most of the problems that I encountered during my IPW2200
based Wireless testbed experiments. However, I have been having
trouble finding the received packet's IP and MAC address together.
Although conceptually wrong, I am trying to get the sender's IP
address for every packet a node receives at the MAC (driver) level.
For this purpose, I have added the follwing code under ipw_rx() of
ipw2200.c.

   static void ipw_rx(struct ipw_priv *priv)
  {   .
      :
      struct iphdr *iph;
      .
      :
      iph = (struct iphdr *) rxb->skb->nh.iph;

      if (iph != NULL) {

         saddr = iph->saddr;
     }

      .
      :
}

However, since "iph" always returns NULL, I am not able to find the
sender's IP address of a packet/frame received. Can you please let me
know whether accessing the IPHdr information is possible at the driver
(MAC) level. If not, how can I get around with this problem.

Thanks in advance for taking your invaluable time to answer my question.

Best Regards,

Siva

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