Peter Murfitt Peter Murfitt - 24 days ago 11
Linux Question

Getting list of network devices inside the Linux kernel

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

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);