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         find_networks() {
  19                 find_networks_cb() {
  20                         local cfg="$1"
  21                         local zone="$2"
  22
  23                         local name
  24                         config_get name "$cfg" name
  25
  26                         [ "$name" = "$zone" ] && {
  27                                 local network
  28                                 config_get network "$cfg" network
  29
  30                                 echo ${network:-$zone}
  31                                 return 1
  32                         }
  33                 }
  34
  35                 config_foreach find_networks_cb zone "$1"
  36         }
  37
  38         setup_fwd() {
  39                 local cfg="$1"
  40
  41                 local src
  42                 config_get src "$cfg" src
  43
  44                 local target
  45                 config_get target "$cfg" target DNAT
  46
  47                 [ "$src" = wan ] && [ "$target" = DNAT ] && {
  48                         local dest
  49                         config_get dest "$cfg" dest "lan"
  50
  51                         local net
  52                         for net in $(find_networks "$dest"); do
  53                                 local lanip=$(uci -P/var/state get network.$net.ipaddr)
  54                                 local lanmk=$(uci -P/var/state get network.$net.netmask)
  55
  56                                 local proto
  57                                 config_get proto "$cfg" proto
  58
  59                                 local reflection
  60                                 config_get_bool reflection "$cfg" reflection 1
  61                                 [ "$reflection" == 1 ] || return
  62
  63                                 local epmin epmax extport
  64                                 config_get extport "$cfg" src_dport
  65                                 [ -n "$extport" ] || return
  66
  67                                 epmin="${extport%[-:]*}"; epmax="${extport#*[-:]}"
  68                                 [ "$epmin" != "$epmax" ] || epmax=""
  69
  70                                 local ipmin ipmax intport
  71                                 config_get intport "$cfg" dest_port "$extport"
  72
  73                                 ipmin="${intport%[-:]*}"; ipmax="${intport#*[-:]}"
  74                                 [ "$ipmin" != "$ipmax" ] || ipmax=""
  75
  76                                 local exthost
  77                                 config_get exthost "$cfg" src_dip "$wanip"
  78
  79                                 local inthost
  80                                 config_get inthost "$cfg" dest_ip
  81                                 [ -n "$inthost" ] || return
  82
  83                                 [ "$proto" = tcpudp ] && proto="tcp udp"
  84
  85                                 [ "${inthost#!}" = "$inthost" ] || return 0
  86                                 [ "${exthost#!}" = "$exthost" ] || return 0
  87
  88                                 local p
  89                                 for p in ${proto:-tcp udp}; do
  90                                         case "$p" in
  91                                                 tcp|udp)
  92                                                         iptables -t nat -A nat_reflection_in \
  93                                                                 -s $lanip/$lanmk -d $exthost \
  94                                                                 -p $p --dport $epmin${epmax:+:$epmax} \
  95                                                                 -j DNAT --to $inthost:$ipmin${ipmax:+-$ipmax}
  96
  97                                                         iptables -t nat -A nat_reflection_out \
  98                                                                 -s $lanip/$lanmk -d $inthost \
  99                                                                 -p $p --dport $ipmin${ipmax:+:$ipmax} \
 100                                                                 -j SNAT --to-source $lanip
 101                                                 ;;
 102                                         esac
 103                                 done
 104                         done
 105                 }
 106         }
 107
 108         config_load firewall
 109         config_foreach setup_fwd redirect
 110 fi
 111