package/firewall/files/lib/core_redirect.sh

   1 # Copyright (C) 2009-2010 OpenWrt.org
   2
   3 fw_config_get_redirect() {
   4         [ "${redirect_NAME}" != "$1" ] || return
   5         fw_config_get_section "$1" redirect { \
   6                 string _name "$1" \
   7                 string name "" \
   8                 string src "" \
   9                 ipaddr src_ip "" \
  10                 ipaddr src_dip "" \
  11                 string src_mac "" \
  12                 string src_port "" \
  13                 string src_dport "" \
  14                 string dest "" \
  15                 ipaddr dest_ip "" \
  16                 string dest_mac "" \
  17                 string dest_port "" \
  18                 string proto "tcpudp" \
  19         } || return
  20         [ -n "$redirect_name" ] || redirect_name=$redirect__name
  21 }
  22
  23 fw_load_redirect() {
  24         fw_config_get_redirect "$1"
  25
  26         fw_callback pre redirect
  27
  28         [ -n "$redirect_src" -a -n "$redirect_dest_ip" ] || {
  29                 fw_die "redirect ${redirect_name}: needs src and dest_ip"
  30         }
  31
  32         local nat_dest_port=$redirect_dest_port
  33         redirect_dest_port=$(fw_get_port_range $redirect_dest_port)
  34         redirect_src_port=$(fw_get_port_range $redirect_src_port)
  35         redirect_src_dport=$(fw_get_port_range $redirect_src_dport)
  36         local fwd_dest_port=${redirect_dest_port:-$redirect_src_dport}
  37
  38         [ "$redirect_proto" == "tcpudp" ] && redirect_proto="tcp udp"
  39         for redirect_proto in $redirect_proto; do
  40                 fw add I n zone_${redirect_src}_prerouting DNAT $ { $redirect_src_ip $redirect_dest_ip } { \
  41                         ${redirect_proto:+-p $redirect_proto} \
  42                         ${redirect_src_ip:+-s $redirect_src_ip} \
  43                         ${redirect_src_dip:+-d $redirect_src_dip} \
  44                         ${redirect_src_port:+--sport $redirect_src_port} \
  45                         ${redirect_src_dport:+--dport $redirect_src_dport} \
  46                         ${redirect_src_mac:+-m mac --mac-source $redirect_src_mac} \
  47                         --to-destination ${redirect_dest_ip}${redirect_dest_port:+:$nat_dest_port} \
  48                 }
  49
  50                 fw add I f zone_${redirect_src}_forward ACCEPT ^ { $redirect_src_ip $redirect_dest_ip } { \
  51                         -d $redirect_dest_ip \
  52                         ${redirect_proto:+-p $redirect_proto} \
  53                         ${redirect_src_ip:+-s $redirect_src_ip} \
  54                         ${redirect_src_port:+--sport $redirect_src_port} \
  55                         ${fwd_dest_port:+--dport $fwd_dest_port} \
  56                         ${redirect_src_mac:+-m mac --mac-source $redirect_src_mac} \
  57                 }
  58         done
  59
  60         fw_callback post redirect
  61 }