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