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#!/bin/sh
# Setup NAT reflection rules
. /etc/functions.sh
if [ "$ACTION" = "ifup" ] && [ "$INTERFACE" = "wan" ]; then
local wanip=$(uci -P/var/state get network.wan.ipaddr)
iptables -t nat -F nat_reflection_in 2>/dev/null || {
iptables -t nat -N nat_reflection_in
iptables -t nat -A prerouting_rule -j nat_reflection_in
}
iptables -t nat -F nat_reflection_out 2>/dev/null || {
iptables -t nat -N nat_reflection_out
iptables -t nat -A postrouting_rule -j nat_reflection_out
}
setup_fwd() {
local cfg="$1"
local src
config_get src "$cfg" src
[ "$src" = wan ] && {
local dest
config_get dest "$cfg" dest "lan"
local lanip=$(uci -P/var/state get network.$dest.ipaddr)
local lanmk=$(uci -P/var/state get network.$dest.netmask)
local proto
config_get proto "$cfg" proto
local epmin epmax extport
config_get extport "$cfg" src_dport
[ -n "$extport" ] || return
epmin="${extport%[-:]*}"; epmax="${extport#*[-:]}"
[ "$epmin" != "$epmax" ] || epmax=""
local ipmin ipmax intport
config_get intport "$cfg" dest_port "$extport"
ipmin="${intport%[-:]*}"; ipmax="${intport#*[-:]}"
[ "$ipmin" != "$ipmax" ] || ipmax=""
local exthost
config_get exthost "$cfg" src_dip "$wanip"
local inthost
config_get inthost "$cfg" dest_ip
[ -n "$inthost" ] || return
[ "$proto" = tcpudp ] && proto="tcp udp"
local p
for p in ${proto:-tcp udp}; do
case "$p" in
tcp|udp)
iptables -t nat -A nat_reflection_in \
-s $lanip/$lanmk -d $exthost \
-p $p --dport $epmin${epmax:+:$epmax} \
-j DNAT --to $inthost:$ipmin${ipmax:+-$ipmax}
iptables -t nat -A nat_reflection_out \
-s $lanip/$lanmk -d $inthost \
-p $p --dport $ipmin${ipmax:+:$ipmax} \
-j SNAT --to-source $lanip
;;
esac
done
}
}
config_load firewall
config_foreach setup_fwd redirect
fi
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