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