From: Mahesh Bandewar
Date: Mon, 1 Jul 2019 14:38:43 -0700
...
> The idea here is to not alter the data-path with additional
> locks or smb()/rmb() barriers to avoid racy assignments but
> to create a new device that has really low MTU that has
> .ndo_start_xmit essentially a kfree_skb(). Make
When we invalidate dst or mark it "dead", we assign 'lo' to
dst->dev. First of all this assignment is racy and more over,
it has MTU implications.
The standard dev MTU is 1500 while the Loopback MTU is 64k. TCP
code when dereferencing the dst don't check if the dst is valid
or not. TCP when derefe
