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 "$1" \
   7                 string name "" \
   8                 string src "" \
   9                 ipaddr src_ip "" \
  10                 ipaddr src_dip "" \
  11                 string src_mac "" \
  12                 string src_port "" \
  13                 string src_dport "" \
  14                 string dest "" \
  15                 ipaddr dest_ip "" \
  16                 string dest_mac "" \
  17                 string dest_port "" \
  18                 string proto "tcpudp" \
  19                 string family "" \
  20                 string target "DNAT" \
  21         } || return
  22         [ -n "$redirect_name" ] || redirect_name=$redirect__name
  23 }
  24
  25 fw_load_redirect() {
  26         fw_config_get_redirect "$1"
  27
  28         fw_callback pre redirect
  29
  30         [ -n "$redirect_src" -a -n "$redirect_dest_ip$redirect_dest_port" ] || {
  31                 fw_die "redirect ${redirect_name}: needs src and dest_ip or dest_port"
  32         }
  33
  34         local chain destopt destaddr
  35         if [ "$redirect_target" == "DNAT" ]; then
  36                 chain="zone_${redirect_src}_prerouting"
  37                 destopt="--to-destination"
  38                 destaddr="$redirect_dest_ip"
  39         elif [ "$redirect_target" == "SNAT" ]; then
  40                 chain="zone_${redirect_src}_nat"
  41                 destopt="--to-source"
  42                 destaddr="$redirect_src_dip"
  43         else
  44                 fw_die "redirect ${redirect_name}: target must be either DNAT or SNAT"
  45         fi
  46
  47         list_contains FW_CONNTRACK_ZONES $redirect_src || \
  48                 append FW_CONNTRACK_ZONES $redirect_src
  49
  50         local mode=$(fw_get_family_mode ${redirect_family:-x} $redirect_src I)
  51
  52         local nat_dest_port=$redirect_dest_port
  53         redirect_dest_port=$(fw_get_port_range $redirect_dest_port)
  54         redirect_src_port=$(fw_get_port_range $redirect_src_port)
  55         redirect_src_dport=$(fw_get_port_range $redirect_src_dport)
  56         local fwd_dest_port=${redirect_dest_port:-$redirect_src_dport}
  57
  58         [ "$redirect_proto" == "tcpudp" ] && redirect_proto="tcp udp"
  59         for redirect_proto in $redirect_proto; do
  60                 fw add $mode n $chain $redirect_target $ { $redirect_src_ip $redirect_dest_ip } { \
  61                         ${redirect_proto:+-p $redirect_proto} \
  62                         ${redirect_src_ip:+-s $redirect_src_ip/$redirect_src_ip_prefixlen} \
  63                         ${redirect_src_dip:+-d $redirect_src_dip/$redirect_src_dip_prefixlen} \
  64                         ${redirect_src_port:+--sport $redirect_src_port} \
  65                         ${redirect_src_dport:+--dport $redirect_src_dport} \
  66                         ${redirect_src_mac:+-m mac --mac-source $redirect_src_mac} \
  67                         $destopt ${redirect_dest_ip}${redirect_dest_port:+:$nat_dest_port} \
  68                 }
  69
  70                 [ -n "$destaddr" ] && \
  71                 fw add $mode f zone_${redirect_src}_forward ACCEPT ^ { $redirect_src_ip $redirect_dest_ip } { \
  72                         -d $destaddr \
  73                         ${redirect_proto:+-p $redirect_proto} \
  74                         ${redirect_src_ip:+-s $redirect_src_ip/$redirect_src_ip_prefixlen} \
  75                         ${redirect_src_port:+--sport $redirect_src_port} \
  76                         ${fwd_dest_port:+--dport $fwd_dest_port} \
  77                         ${redirect_src_mac:+-m mac --mac-source $redirect_src_mac} \
  78                 }
  79         done
  80
  81         fw_callback post redirect
  82 }