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-rw-r--r--package/network/config/firewall/files/reflection.hotplug132
1 files changed, 132 insertions, 0 deletions
diff --git a/package/network/config/firewall/files/reflection.hotplug b/package/network/config/firewall/files/reflection.hotplug
new file mode 100644
index 000000000..843c615bc
--- /dev/null
+++ b/package/network/config/firewall/files/reflection.hotplug
@@ -0,0 +1,132 @@
+#!/bin/sh
+
+. /lib/functions.sh
+. /lib/functions/network.sh
+
+if [ "$ACTION" = "add" ] && [ "$INTERFACE" = "wan" ]; then
+ local wanip
+ network_get_ipaddr wanip wan || return
+
+ 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
+ }
+
+ iptables -t filter -F nat_reflection_fwd 2>/dev/null || {
+ iptables -t filter -N nat_reflection_fwd
+ iptables -t filter -A forwarding_rule -j nat_reflection_fwd
+ }
+
+ find_networks() {
+ find_networks_cb() {
+ local cfg="$1"
+ local zone="$2"
+
+ local name
+ config_get name "$cfg" name
+
+ [ "$name" = "$zone" ] && {
+ local network
+ config_get network "$cfg" network
+
+ echo ${network:-$zone}
+ return 1
+ }
+ }
+
+ config_foreach find_networks_cb zone "$1"
+ }
+
+ setup_fwd() {
+ local cfg="$1"
+
+ local reflection
+ config_get_bool reflection "$cfg" reflection 1
+ [ "$reflection" == 1 ] || return
+
+ local src
+ config_get src "$cfg" src
+
+ local target
+ config_get target "$cfg" target DNAT
+
+ [ "$src" = wan ] && [ "$target" = DNAT ] && {
+ local dest
+ config_get dest "$cfg" dest "lan"
+ [ "$dest" != "*" ] || return
+
+ local net
+ for net in $(find_networks "$dest"); do
+ local lannet
+ network_get_subnet lannet "$net" || return
+
+ local proto
+ config_get proto "$cfg" proto
+
+ local epmin epmax extport
+ config_get extport "$cfg" src_dport "1-65535"
+ [ -n "$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
+
+ [ "$proto" = all ] && proto="tcp udp"
+ [ "$proto" = tcpudp ] && proto="tcp udp"
+
+ [ "${inthost#!}" = "$inthost" ] || return 0
+ [ "${exthost#!}" = "$exthost" ] || return 0
+
+ [ "${epmin#!}" != "$epmin" ] && \
+ extport="! --dport ${epmin#!}${epmax:+:$epmax}" || \
+ extport="--dport $epmin${epmax:+:$epmax}"
+
+ [ "${ipmin#!}" != "$ipmin" ] && \
+ intport="! --dport ${ipmin#!}${ipmax:+:$ipmax}" || \
+ intport="--dport $ipmin${ipmax:+:$ipmax}"
+
+ local p
+ for p in ${proto:-tcp udp}; do
+ case "$p" in
+ tcp|udp|6|17)
+ iptables -t nat -A nat_reflection_in \
+ -s $lannet -d $exthost \
+ -p $p $extport \
+ -j DNAT --to $inthost:${ipmin#!}${ipmax:+-$ipmax}
+
+ iptables -t nat -A nat_reflection_out \
+ -s $lannet -d $inthost \
+ -p $p $intport \
+ -j SNAT --to-source ${lannet%%/*}
+
+ iptables -t filter -A nat_reflection_fwd \
+ -s $lannet -d $inthost \
+ -p $p $intport \
+ -j ACCEPT
+ ;;
+ esac
+ done
+ done
+ }
+ }
+
+ config_load firewall
+ config_foreach setup_fwd redirect
+fi