package/firewall/files/reflection.hotplug

   1 #!/bin/sh
   2
   3 . /etc/functions.sh
   4
   5 if [ "$ACTION" = "add" ] && [ "$INTERFACE" = "wan" ]; then
   6         local wanip=$(uci -P/var/state get network.wan.ipaddr)
   7
   8         iptables -t nat -F nat_reflection_in 2>/dev/null || {
   9                 iptables -t nat -N nat_reflection_in
  10                 iptables -t nat -A prerouting_rule -j nat_reflection_in
  11         }
  12
  13         iptables -t nat -F nat_reflection_out 2>/dev/null || {
  14                 iptables -t nat -N nat_reflection_out
  15                 iptables -t nat -A postrouting_rule -j nat_reflection_out
  16         }
  17
  18         iptables -t filter -F nat_reflection_fwd 2>/dev/null || {
  19                 iptables -t filter -N nat_reflection_fwd
  20                 iptables -t filter -A forwarding_rule -j nat_reflection_fwd
  21         }
  22
  23         find_networks() {
  24                 find_networks_cb() {
  25                         local cfg="$1"
  26                         local zone="$2"
  27
  28                         local name
  29                         config_get name "$cfg" name
  30
  31                         [ "$name" = "$zone" ] && {
  32                                 local network
  33                                 config_get network "$cfg" network
  34
  35                                 echo ${network:-$zone}
  36                                 return 1
  37                         }
  38                 }
  39
  40                 config_foreach find_networks_cb zone "$1"
  41         }
  42
  43         setup_fwd() {
  44                 local cfg="$1"
  45
  46                 local reflection
  47                 config_get_bool reflection "$cfg" reflection 1
  48                 [ "$reflection" == 1 ] || return
  49
  50                 local src
  51                 config_get src "$cfg" src
  52
  53                 local target
  54                 config_get target "$cfg" target DNAT
  55
  56                 [ "$src" = wan ] && [ "$target" = DNAT ] && {
  57                         local dest
  58                         config_get dest "$cfg" dest "lan"
  59                         [ "$dest" != "*" ] || return
  60
  61                         local net
  62                         for net in $(find_networks "$dest"); do
  63                                 local lanip=$(uci -P/var/state get network.$net.ipaddr)
  64                                 local lanmk=$(uci -P/var/state get network.$net.netmask)
  65
  66                                 local proto
  67                                 config_get proto "$cfg" proto
  68
  69                                 local epmin epmax extport
  70                                 config_get extport "$cfg" src_dport
  71                                 [ -n "$extport" ] || return
  72
  73                                 epmin="${extport%[-:]*}"; epmax="${extport#*[-:]}"
  74                                 [ "${epmin#!}" != "$epmax" ] || epmax=""
  75
  76                                 local ipmin ipmax intport
  77                                 config_get intport "$cfg" dest_port "$extport"
  78
  79                                 ipmin="${intport%[-:]*}"; ipmax="${intport#*[-:]}"
  80                                 [ "${ipmin#!}" != "$ipmax" ] || ipmax=""
  81
  82                                 local exthost
  83                                 config_get exthost "$cfg" src_dip "$wanip"
  84
  85                                 local inthost
  86                                 config_get inthost "$cfg" dest_ip
  87                                 [ -n "$inthost" ] || return
  88
  89                                 [ "$proto" = tcpudp ] && proto="tcp udp"
  90
  91                                 [ "${inthost#!}" = "$inthost" ] || return 0
  92                                 [ "${exthost#!}" = "$exthost" ] || return 0
  93
  94                                 [ "${epmin#!}" != "$epmin" ] && \
  95                                         extport="! --dport ${epmin#!}${epmax:+:$epmax}" || \
  96                                         extport="--dport $epmin${epmax:+:$epmax}"
  97
  98                                 [ "${ipmin#!}" != "$ipmin" ] && \
  99                                         intport="! --dport ${ipmin#!}${ipmax:+:$ipmax}" || \
 100                                         intport="--dport $ipmin${ipmax:+:$ipmax}"
 101
 102                                 local p
 103                                 for p in ${proto:-tcp udp}; do
 104                                         case "$p" in
 105                                                 tcp|udp)
 106                                                         iptables -t nat -A nat_reflection_in \
 107                                                                 -s $lanip/$lanmk -d $exthost \
 108                                                                 -p $p $extport \
 109                                                                 -j DNAT --to $inthost:${ipmin#!}${ipmax:+-$ipmax}
 110
 111                                                         iptables -t nat -A nat_reflection_out \
 112                                                                 -s $lanip/$lanmk -d $inthost \
 113                                                                 -p $p $intport \
 114                                                                 -j SNAT --to-source $lanip
 115
 116                                                         iptables -t filter -A nat_reflection_fwd \
 117                                                                 -s $lanip/$lanmk -d $inthost \
 118                                                                 -p $p $intport \
 119                                                                 -j ACCEPT
 120                                                 ;;
 121                                         esac
 122                                 done
 123                         done
 124                 }
 125         }
 126
 127         config_load firewall
 128         config_foreach setup_fwd redirect
 129 fi