package/firewall/files/reflection.hotplug

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