commit 50413e1ec8 replaced ifconfig
with ip. In order to set a link state to up, the interface needs
to be added first.
Fixes: FS#3754
Signed-off-by: Perry Melange <isprotejesvalkata@gmail.com>
[Add Fixes tag]
Signed-off-by: Baptiste Jonglez <git@bitsofnetworks.org>
(cherry picked from commit 23c3bab920)
Also ensure that the error message is actually printed to stderr and that
the rule generation is aborted if an interface cannot be resolved.
Ref: https://github.com/openwrt/luci/issues/3975
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
