Getting list of network devices inside the Linux kernel

Question

I've been looking through net/core/dev.c and other files to try to find out how to get the list of network devices that are currently configured and it's proving to be a little difficult to find.

The end goal is to be able to get network device statistics using dev_get_stats in dev.c, but I need to know the current interfaces so I can grab the net_device struct to pass in. I'm having to do this inside the kernel as I'm writing a module which adds in a new /proc/ entry which relates to some statistics from the current network devices so from what I can gather this must be done inside the kernel.

If someone could point me to how to get the interfaces it would be much appreciated.

Answer 1

This ought to do the trick:

#include <linux/netdevice.h>

struct net_device *dev;

read_lock(&dev_base_lock);

dev = first_net_device(&init_net);
while (dev) {
    printk(KERN_INFO "found [%s]\n", dev->name);
    dev = next_net_device(dev);
}

read_unlock(&dev_base_lock);