Re: Getting a NIC's MTU size

From: David Howells <dhowells@redhat.com>
Date: Thu, 20 Feb 2014 17:30:23 +0000

David Miller [off-list ref] wrote:

quoted

quoted

One further question: If I want to get the MTU size of the NIC through
which packets will go to get to a particular peer, can I do:

As has been suggested or at least hinted to by others, you have to use
the route dst's device pointer.

So I gather.  My query was intended to be about the safety of accessing the
dst->dev pointer.  Can I just dereference it?  Or do I need to take a lock or
use RCU?

If the dst is valid and you have a reference to it, dst->dev is good.