On linux systems running >=linux-3.2, the /proc/net/dev file cannot be
relied on to show the order network interfaces were added to the system.
Also, there is currently a bug in the implementation of the seek call
for this file which can cause a system to go into an infinite loop.
This commit changes the _ifindex function to retreive the value of
/sys/class/net/${IFACE}/ifindex and use that value instead of attempting
to calculate one from the interface's position in /proc/net/dev.
reported-by: John Keeping <john.keeping@lineone.net>
X-Gentoo-Bug: 410127
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=410127
9127684553