If you want to scan the interface list from kernel space you can do something like:

{
        struct device *dev;

        for (dev = dev_base; dev != NULL; dev = dev->next) 
        {
                /* your code here */
                /* example */
                
                if (dev->family == AF_INET)
                {
                        /* this is an inet device */
                }

                if (dev->type == ARPHRD_ETHER)
                {
                        /* this is ethernet */
                }
        }
}

./Pedro.