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--[[
NAT module for Alpine Wall
Copyright (C) 2012 Kaarle Ritvanen
Licensed under the terms of GPL2
]]--
module(..., package.seeall)
require 'awall.model'
require 'awall.util'
local model = awall.model
local NATRule = model.class(model.Rule)
function NATRule:init(...)
model.Rule.init(self, unpack(arg))
for i, dir in ipairs({'in', 'out'}) do
if awall.util.contains(self[dir], model.fwzone) then
self:error('NAT rules not allowed for firewall zone')
end
end
end
function NATRule:defaultzones() return {nil} end
function NATRule:checkzoneoptfrag(ofrag)
if ofrag[self.params.forbidif] then
self:error('Cannot specify '..self.params.forbidif..'bound interface for '..self.params.target..' rule')
end
end
function NATRule:trules()
local res = {}
for i, ofrags in ipairs(model.Rule.trules(self)) do
if ofrags.family == 'inet' then table.insert(res, ofrags) end
end
return res
end
function NATRule:table() return 'nat' end
function NATRule:chain() return self.params.chain end
function NATRule:target()
if self.action then return model.Rule.target(self) end
local target
if self['ip-range'] then
target = self.params.target..' --to-'..self.params.subject..' '..self['ip-range']
else target = self.params.deftarget end
if self['port-range'] then target = target..':'..self['port-range'] end
return target
end
local DNATRule = model.class(NATRule)
function DNATRule:init(...)
NATRule.init(self, unpack(arg))
self.params = {forbidif='out', subject='destination',
chain='PREROUTING', target='DNAT', deftarget='REDIRECT'}
end
local SNATRule = model.class(NATRule)
function SNATRule:init(...)
NATRule.init(self, unpack(arg))
self.params = {forbidif='in', subject='source',
chain='POSTROUTING', target='SNAT', deftarget='MASQUERADE'}
end
classes = {{'dnat', DNATRule},
{'snat', SNATRule}}
defrules = {}
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