v2: fix compilation warning for snprintf
v3: check iptables has xtables locks support once on init
v4: switch opts to kdat
Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>