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 "$1"
  27
  28         fw_callback pre redirect
  29
  30         local fwdchain natchain natopt nataddr natports srcdaddr srcdports
  31         if [ "$redirect_target" == "DNAT" ]; then
  32                 [ -n "$redirect_src" -a -n "$redirect_dest_ip$redirect_dest_port" ] || {
  33                         fw_die "DNAT redirect ${redirect_name}: needs src and dest_ip or dest_port"
  34                 }
  35
  36                 fwdchain="zone_${redirect_src}_forward"
  37
  38                 natopt="--to-destination"
  39                 natchain="zone_${redirect_src}_prerouting"
  40                 nataddr="$redirect_dest_ip"
  41                 fw_get_port_range natports "$redirect_dest_port" "-"
  42
  43                 srcdaddr="${redirect_src_dip:+$redirect_src_dip/$redirect_src_dip_prefixlen}"
  44                 fw_get_port_range srcdports "$redirect_src_dport" ":"
  45
  46                 list_contains FW_CONNTRACK_ZONES $redirect_src || \
  47                         append FW_CONNTRACK_ZONES $redirect_src
  48
  49         elif [ "$redirect_target" == "SNAT" ]; then
  50                 [ -n "$redirect_dest" -a -n "$redirect_src_dip" ] || {
  51                         fw_die "SNAT redirect ${redirect_name}: needs dest and src_dip"
  52                 }
  53
  54                 fwdchain="${redirect_src:+zone_${redirect_src}_forward}"
  55
  56                 natopt="--to-source"
  57                 natchain="zone_${redirect_dest}_nat"
  58                 nataddr="$redirect_src_dip"
  59                 fw_get_port_range natports "$redirect_src_dport" "-"
  60
  61                 srcdaddr="${redirect_dest_ip:+$redirect_dest_ip/$redirect_dest_ip_prefixlen}"
  62                 fw_get_port_range srcdports "$redirect_dest_port" ":"
  63
  64                 list_contains FW_CONNTRACK_ZONES $redirect_dest || \
  65                         append FW_CONNTRACK_ZONES $redirect_dest
  66
  67         else
  68                 fw_die "redirect ${redirect_name}: target must be either DNAT or SNAT"
  69         fi
  70
  71         local mode
  72         fw_get_family_mode mode ${redirect_family:-x} ${redirect_src:-$redirect_dest} I
  73
  74         local srcaddr="${redirect_src_ip:+$redirect_src_ip/$redirect_src_ip_prefixlen}"
  75         local srcports
  76         fw_get_port_range srcports "$redirect_src_port" ":"
  77
  78         local destaddr="${redirect_dest_ip:+$redirect_dest_ip/$redirect_dest_ip_prefixlen}"
  79         local destports
  80         fw_get_port_range destports "${redirect_dest_port:-$redirect_src_dport}" ":"
  81
  82         [ "$redirect_proto" == "tcpudp" ] && redirect_proto="tcp udp"
  83         for redirect_proto in $redirect_proto; do
  84                 fw add $mode n $natchain $redirect_target ^ { $redirect_src_ip $redirect_dest_ip } { \
  85                         ${redirect_proto:+-p $redirect_proto} \
  86                         ${srcaddr:+-s $srcaddr} \
  87                         ${srcports:+--sport $srcports} \
  88                         ${srcdaddr:+-d $srcdaddr} \
  89                         ${srcdports:+--dport $srcdports} \
  90                         ${redirect_src_mac:+-m mac --mac-source $redirect_src_mac} \
  91                         $natopt $nataddr${natports:+:$natports} \
  92                 }
  93
  94                 [ -n "$destaddr" ] && \
  95                 fw add $mode f ${fwdchain:-forward} ACCEPT ^ { $redirect_src_ip $redirect_dest_ip } { \
  96                         ${redirect_proto:+-p $redirect_proto} \
  97                         ${srcaddr:+-s $srcaddr} \
  98                         ${srcports:+--sport $srcports} \
  99                         ${destaddr:+-d $destaddr} \
 100                         ${destports:+--dport $destports} \
 101                         ${redirect_src_mac:+-m mac --mac-source $redirect_src_mac} \
 102                 }
 103         done
 104
 105         fw_callback post redirect
 106 }