159 lines
3.5 KiB
Bash
159 lines
3.5 KiB
Bash
#!/bin/sh
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. /etc/functions.sh
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. /usr/share/libubox/jshn.sh
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find_iface_address()
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{
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local iface="$1"
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local ipaddr="$2"
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local prefix="$3"
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local tmp="$(ubus call network.interface."$iface" status 2>/dev/null)"
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json_load "${tmp:-{}}"
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json_get_type tmp address
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if [ "$tmp" = array ]; then
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json_select address
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json_get_type tmp 1
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if [ "$tmp" = object ]; then
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json_select 1
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[ -n "$ipaddr" ] && json_get_var "$ipaddr" address
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[ -n "$prefix" ] && json_get_var "$prefix" mask
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fi
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fi
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}
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if [ "$ACTION" = "add" ] && [ "$INTERFACE" = "wan" ]; then
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local wanip
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find_iface_address wan wanip
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[ -n "$wanip" ] || return
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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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iptables -t filter -F nat_reflection_fwd 2>/dev/null || {
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iptables -t filter -N nat_reflection_fwd
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iptables -t filter -A forwarding_rule -j nat_reflection_fwd
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}
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find_networks() {
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find_networks_cb() {
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local cfg="$1"
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local zone="$2"
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local name
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config_get name "$cfg" name
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[ "$name" = "$zone" ] && {
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local network
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config_get network "$cfg" network
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echo ${network:-$zone}
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return 1
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}
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}
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config_foreach find_networks_cb zone "$1"
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}
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setup_fwd() {
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local cfg="$1"
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local reflection
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config_get_bool reflection "$cfg" reflection 1
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[ "$reflection" == 1 ] || return
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local src
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config_get src "$cfg" src
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local target
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config_get target "$cfg" target DNAT
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[ "$src" = wan ] && [ "$target" = DNAT ] && {
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local dest
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config_get dest "$cfg" dest "lan"
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[ "$dest" != "*" ] || return
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local net
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for net in $(find_networks "$dest"); do
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local lanip lanmk
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find_iface_address "$net" lanip lanmk
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[ -n "$lanip" ] || return
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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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[ "${inthost#!}" = "$inthost" ] || return 0
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[ "${exthost#!}" = "$exthost" ] || return 0
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[ "${epmin#!}" != "$epmin" ] && \
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extport="! --dport ${epmin#!}${epmax:+:$epmax}" || \
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extport="--dport $epmin${epmax:+:$epmax}"
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[ "${ipmin#!}" != "$ipmin" ] && \
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intport="! --dport ${ipmin#!}${ipmax:+:$ipmax}" || \
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intport="--dport $ipmin${ipmax:+:$ipmax}"
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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|6|17)
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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 $extport \
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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 $intport \
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-j SNAT --to-source $lanip
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iptables -t filter -A nat_reflection_fwd \
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-s $lanip/$lanmk -d $inthost \
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-p $p $intport \
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-j ACCEPT
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;;
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esac
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done
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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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