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_log error "DNAT redirect ${redirect_name}: needs src and dest_ip or dest_port, skipping"
  34                         return 0
  35                 }
  36
  37                 fwdchain="zone_${redirect_src}_forward"
  38
  39                 natopt="--to-destination"
  40                 natchain="zone_${redirect_src}_prerouting"
  41                 nataddr="$redirect_dest_ip"
  42                 fw_get_port_range natports "$redirect_dest_port" "-"
  43
  44                 fw_get_negation srcdaddr '-d' "${redirect_src_dip:+$redirect_src_dip/$redirect_src_dip_prefixlen}"
  45                 fw_get_port_range srcdports "$redirect_src_dport" ":"
  46
  47                 list_contains FW_CONNTRACK_ZONES $redirect_src || \
  48                         append FW_CONNTRACK_ZONES $redirect_src
  49
  50         elif [ "$redirect_target" == "SNAT" ]; then
  51                 [ -n "$redirect_dest" -a -n "$redirect_src_dip" ] || {
  52                         fw_log error "SNAT redirect ${redirect_name}: needs dest and src_dip, skipping"
  53                         return 0
  54                 }
  55
  56                 fwdchain="${redirect_src:+zone_${redirect_src}_forward}"
  57
  58                 natopt="--to-source"
  59                 natchain="zone_${redirect_dest}_nat"
  60                 nataddr="$redirect_src_dip"
  61                 fw_get_port_range natports "$redirect_src_dport" "-"
  62
  63                 fw_get_negation srcdaddr '-d' "${redirect_dest_ip:+$redirect_dest_ip/$redirect_dest_ip_prefixlen}"
  64                 fw_get_port_range srcdports "$redirect_dest_port" ":"
  65
  66                 list_contains FW_CONNTRACK_ZONES $redirect_dest || \
  67                         append FW_CONNTRACK_ZONES $redirect_dest
  68
  69         else
  70                 fw_log error "redirect ${redirect_name}: target must be either DNAT or SNAT, skipping"
  71                 return 0
  72         fi
  73
  74         local mode
  75         fw_get_family_mode mode ${redirect_family:-x} ${redirect_src:-$redirect_dest} I
  76
  77         local srcaddr
  78         fw_get_negation srcaddr '-s' "${redirect_src_ip:+$redirect_src_ip/$redirect_src_ip_prefixlen}"
  79
  80         local srcports
  81         fw_get_port_range srcports "$redirect_src_port" ":"
  82
  83         local destaddr
  84         fw_get_negation destaddr '-d' "${redirect_dest_ip:+$redirect_dest_ip/$redirect_dest_ip_prefixlen}"
  85
  86         local destports
  87         fw_get_port_range destports "${redirect_dest_port:-$redirect_src_dport}" ":"
  88
  89         [ "$redirect_proto" == "tcpudp" ] && redirect_proto="tcp udp"
  90         for redirect_proto in $redirect_proto; do
  91                 fw add $mode n $natchain $redirect_target ^ { $redirect_src_ip $redirect_dest_ip } { \
  92                         $srcaddr $srcdaddr \
  93                         ${redirect_proto:+-p $redirect_proto} \
  94                         ${srcports:+--sport $srcports} \
  95                         ${srcdports:+--dport $srcdports} \
  96                         ${redirect_src_mac:+-m mac --mac-source $redirect_src_mac} \
  97                         $natopt $nataddr${natports:+:$natports} \
  98                 }
  99
 100                 [ -n "$destaddr" ] && \
 101                 fw add $mode f ${fwdchain:-forward} ACCEPT ^ { $redirect_src_ip $redirect_dest_ip } { \
 102                         $srcaddr $destaddr \
 103                         ${redirect_proto:+-p $redirect_proto} \
 104                         ${srcports:+--sport $srcports} \
 105                         ${destports:+--dport $destports} \
 106                         ${redirect_src_mac:+-m mac --mac-source $redirect_src_mac} \
 107                 }
 108         done
 109
 110         fw_callback post redirect
 111 }