33d121cec41e8b6fc8284b6d980e279d53257cb3
[openwrt-10.03/.git] / package / firewall / files / reflection.hotplug
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
60                         local net
61                         for net in $(find_networks "$dest"); do
62                                 local lanip=$(uci -P/var/state get network.$net.ipaddr)
63                                 local lanmk=$(uci -P/var/state get network.$net.netmask)
64
65                                 local proto
66                                 config_get proto "$cfg" proto
67
68                                 local epmin epmax extport
69                                 config_get extport "$cfg" src_dport
70                                 [ -n "$extport" ] || return
71
72                                 epmin="${extport%[-:]*}"; epmax="${extport#*[-:]}"
73                                 [ "$epmin" != "$epmax" ] || epmax=""
74
75                                 local ipmin ipmax intport
76                                 config_get intport "$cfg" dest_port "$extport"
77
78                                 ipmin="${intport%[-:]*}"; ipmax="${intport#*[-:]}"
79                                 [ "$ipmin" != "$ipmax" ] || ipmax=""
80
81                                 local exthost
82                                 config_get exthost "$cfg" src_dip "$wanip"
83
84                                 local inthost
85                                 config_get inthost "$cfg" dest_ip
86                                 [ -n "$inthost" ] || return
87
88                                 [ "$proto" = tcpudp ] && proto="tcp udp"
89
90                                 [ "${inthost#!}" = "$inthost" ] || return 0
91                                 [ "${exthost#!}" = "$exthost" ] || return 0
92
93                                 local p
94                                 for p in ${proto:-tcp udp}; do
95                                         case "$p" in
96                                                 tcp|udp)
97                                                         iptables -t nat -A nat_reflection_in \
98                                                                 -s $lanip/$lanmk -d $exthost \
99                                                                 -p $p --dport $epmin${epmax:+:$epmax} \
100                                                                 -j DNAT --to $inthost:$ipmin${ipmax:+-$ipmax}
101
102                                                         iptables -t nat -A nat_reflection_out \
103                                                                 -s $lanip/$lanmk -d $inthost \
104                                                                 -p $p --dport $ipmin${ipmax:+:$ipmax} \
105                                                                 -j SNAT --to-source $lanip
106
107                                                         iptables -t filter -A nat_reflection_fwd \
108                                                                 -s $lanip/$lanmk -d $inthost \
109                                                                 -p $p --dport $ipmin${ipmax:+:$ipmax} \
110                                                                 -j ACCEPT
111                                                 ;;
112                                         esac
113                                 done
114                         done
115                 }
116         }
117
118         config_load firewall
119         config_foreach setup_fwd redirect
120 fi