firewall: implement support for abritary netmasks

Properly parse and pass arbritary netmasks to iptables, this allows
specifying ranges like '::c23f:eff:fe7a:a094/::ffff:ffff:ffff:ffff' to
match the host part of an IPv6 address regardless of the currently active
IPv6 prefix.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41760 3c298f89-4303-0410-b956-a3cf2f4a3e73
usbmode: update to latest git and also update the device database

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41761 3c298f89-4303-0410-b956-a3cf2f4a3e73