module for getting underlying ethernet hardware and IP address...

["Tej Parkash" <tejparkash.d@xxxxxxxxx>]

hi
i have written small code which find out the MAC and IP address of any
underlying ethernet device. I have written it as a module. I just want
to know at any codition this code will fail and give me some kind of
error.

code is as follows:
{
struct in_device *in_dev;
struct in_ifaddr **ifap=NULL;
struct in_ifaddr *ifrr=NULL;
struct net_device *device;
ifra.ifr_ifindex=2;
printk("module is inserted\n");
device = __dev_get_by_index(ifra.ifr_ifindex);
if(!device)
       {
               printk("could not receive the netdevice interface references");
       }

printk("Interafce Name = %s\n",device->name);
in_dev=(struct in_device*)device->ip_ptr;
if(!in_dev)
       {
               printk("could not get the reference of the in_device");
       }

ifap =&in_dev->ifa_list;
if(!ifap)
       {
               printk("I am getting the refernce of the ifa_list");
       }

ifrr=*ifap;
printk("%u.%u.%u.%u", NIPQUAD(ifrr->ifa_local));

}

thanks
TEJ
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