2 # Copyright (C) 2008 John Crispin <blogic@openwrt.org>
6 IPTABLES
="echo iptables"
17 ZONE_LIST
=$CONFIG_SECTION
24 config_get input
$1 input
25 config_get output
$1 output
26 config_get forward
$1 forward
28 [ -z "$input" ] && input
=$DEF_INPUT
29 [ -z "$output" ] && output
=$DEF_OUTPUT
30 [ -z "$forward" ] && forward
=$DEF_FORWARD
36 [ "$1" == "loopback" ] && return
38 config_get exists
$ZONE_LIST $1
39 [ -n "$exists" ] && return
40 config_set
$ZONE_LIST $1 1
43 $IPTABLES -N zone_
$1_ACCEPT
44 $IPTABLES -N zone_
$1_DROP
45 $IPTABLES -N zone_
$1_REJECT
46 $IPTABLES -N zone_
$1_forward
47 $IPTABLES -A zone_
$1_forward -j zone_
$1_$5
48 $IPTABLES -A zone_
$1 -j zone_
$1_$3
49 $IPTABLES -A OUTPUT
-j zone_
$1_$4
50 $IPTABLES -N zone_
$1_nat -t nat
51 $IPTABLES -N zone_
$1_prerouting -t nat
52 [ "$6" == "1" ] && $IPTABLES -t nat
-A POSTROUTING
-j zone_
$2_nat
56 logger
"adding $1 to firewall zone $2"
57 $IPTABLES -A INPUT
-i $1 -j zone_
$2
58 $IPTABLES -I zone_
$2_ACCEPT 1 -o $1 -j ACCEPT
59 $IPTABLES -I zone_
$2_DROP 1 -o $1 -j DROP
60 $IPTABLES -I zone_
$2_REJECT 1 -o $1 -j REJECT
61 $IPTABLES -I zone_
$2_ACCEPT 1 -i $1 -j ACCEPT
62 $IPTABLES -I zone_
$2_DROP 1 -i $1 -j DROP
63 $IPTABLES -I zone_
$2_REJECT 1 -i $1 -j REJECT
64 $IPTABLES -I zone_
$2_nat 1 -t nat
-o $1 -j MASQUERADE
65 $IPTABLES -I PREROUTING
1 -t nat
-i $1 -j zone_
$2_prerouting
66 $IPTABLES -A FORWARD
-i $1 -j zone_
$2_forward
70 logger
"removing $1 from firewall zone $2"
71 $IPTABLES -D INPUT
-i $1 -j zone_
$2
72 $IPTABLES -D zone_
$2_ACCEPT -o $1 -j ACCEPT
73 $IPTABLES -D zone_
$2_DROP -o $1 -j DROP
74 $IPTABLES -D zone_
$2_REJECT -o $1 -j REJECT
75 $IPTABLES -D zone_
$2_ACCEPT -i $1 -j ACCEPT
76 $IPTABLES -D zone_
$2_DROP -i $1 -j DROP
77 $IPTABLES -D zone_
$2_REJECT -i $1 -j REJECT
78 $IPTABLES -D zone_
$2_nat -t nat
-o $1 -j MASQUERADE
79 $IPTABLES -D PREROUTING
-t nat
-i $1 -j zone_
$2_prerouting
80 $IPTABLES -D FORWARD
-i $1 -j zone_
$2_forward
84 echo "Loading synflood protection"
85 $IPTABLES -N SYN_FLOOD
86 $IPTABLES -A SYN_FLOOD
-p tcp
--syn -m limit
--limit ${1}/second
--limit-burst $2 -j RETURN
87 $IPTABLES -A SYN_FLOOD
-p ! tcp
-j RETURN
88 $IPTABLES -A SYN_FLOOD
-p tcp
! --syn -j RETURN
89 $IPTABLES -A SYN_FLOOD
-j LOG
--log-prefix "syn_flood: "
90 $IPTABLES -A SYN_FLOOD
-j DROP
91 $IPTABLES -A INPUT
-p tcp
--syn -j SYN_FLOOD
100 echo 1 > /proc
/sys
/net
/ipv
4/tcp_syncookies
101 for f
in /proc
/sys
/net
/ipv
4/conf
/*/accept_redirects
105 for f
in /proc
/sys
/net
/ipv
4/conf
/*/accept_source_route
112 $IPTABLES -t mangle
-F
116 $IPTABLES -P INPUT
$input
117 $IPTABLES -A INPUT
-m state
--state INVALID
-j DROP
118 $IPTABLES -A INPUT
-m state
--state RELATED
,ESTABLISHED
-j ACCEPT
120 $IPTABLES -P OUTPUT
$output
121 $IPTABLES -A OUTPUT
-m state
--state INVALID
-j DROP
122 $IPTABLES -A OUTPUT
-m state
--state RELATED
,ESTABLISHED
-j ACCEPT
124 $IPTABLES -P FORWARD
$forward
125 $IPTABLES -A FORWARD
-m state
--state INVALID
-j DROP
126 $IPTABLES -A FORWARD
-p tcp
--tcp-flags SYN
,RST SYN
-j TCPMSS
--clamp-mss-to-pmtu
127 $IPTABLES -A FORWARD
-m state
--state RELATED
,ESTABLISHED
-j ACCEPT
129 $IPTABLES -A INPUT
-i lo
-j ACCEPT
130 $IPTABLES -A OUTPUT
-o lo
-j ACCEPT
132 config_get syn_flood
$1 syn_flood
133 config_get syn_rate
$1 syn_rate
134 config_get syn_burst
$1 syn_burst
136 [ -z "$syn_rate" ] && syn_rate
=25
137 [ -z "$syn_burst" ] && syn_burst
=50
138 [ "$syn_flood" == "1" ] && load_synflood
$syn_rate $syn_burst
146 config_get name
$1 name
147 config_get network
$1 network
148 config_get masq
$1 masq
151 [ -z "$network" ] && network
=$name
152 create_zone
"$name" "$network" "$input" "$output" "$forward" "$masq"
167 config_get src
$1 src
168 config_get src_ip
$1 src_ip
169 config_get src_mac
$1 src_mac
170 config_get src_port
$1 src_port
171 config_get dest
$1 dest
172 config_get dest_ip
$1 dest_ip
173 config_get dest_port
$1 dest_port
174 config_get proto
$1 proto
175 config_get target
$1 target
176 config_get ruleset
$1 ruleset
178 [ -z "$target" ] && target
=DROP
179 [ -n "$src" ] && ZONE
=zone_
$src || ZONE
=INPUT
180 [ -n "$dest" ] && TARGET
=zone_
${dest}_
$target || TARGET
=$target
181 [ -n "$dest_port" -a -z "$proto" ] && { \
182 echo "dport may only be used it proto is defined"; return; }
183 $IPTABLES -I $ZONE 1 \
184 ${proto:+-p $proto} \
185 ${src_ip:+-s $src_ip} \
186 ${src_port:+--sport $src_port} \
187 ${src_mac:+-m mac --mac-source $src_mac} \
188 ${dest_ip:+-d $dest_ip} \
189 ${dest_port:+--dport $dest_port} \
198 config_get src
$1 src
199 config_get dest
$1 dest
200 [ -n "$src" ] && z_src
=zone_
${src}_forward || z_src
=FORWARD
201 [ -n "$dest" ] && z_dest
=zone_
${dest}_ACCEPT || z_dest
=ACCEPT
202 $IPTABLES -I $z_src 1 -j $z_dest
215 config_get src
$1 src
216 config_get src_ip
$1 src_ip
217 config_get src_port
$1 src_port
218 config_get src_dport
$1 src_dport
219 config_get src_mac
$1 src_mac
220 config_get dest_ip
$1 dest_ip
221 config_get dest_port
$1 dest_port
222 config_get protocol
$1 protocol
223 [ -z "$src" -o -z "$dest_ip" ] && { \
224 echo "redirect needs src and dest_ip"; return ; }
225 [ -n "$dest_port" -a -z "$protocol" ] && { \
226 echo "dport may only be used it proto is defined"; return; }
227 $IPTABLES -A zone_
${src}_prerouting
-t nat \
228 ${protocol:+-p $protocol} \
229 ${src_ip:+-s $srcdip} \
230 ${src_port:+--sport $src_port} \
231 ${src_dport:+--dport $src_dport} \
232 ${src_mac:+-m mac --mac-source $src_mac} \
233 -j DNAT
--to-destination $dest_ip${dest_port:+:$dest_port}
234 $IPTABLES -I zone_
${src}_forward
1 \
235 ${protocol:+-p $protocol} \
237 ${src_ip:+-s $srcdip} \
238 ${src_port:+--sport $src_port} \
239 ${dest_port:+--dport $dest_port} \
240 ${src_mac:+-m mac --mac-source $src_mac} \
246 config_get path
$1 path
247 [ -e $path ] && .
$path
254 config_get ifname
$1 ifname
255 [ -n "$up" ] ||
return 0
256 (ACTION
="ifup" INTERFACE
="$1" .
/etc
/hotplug.d
/iface
/20-firewall)
260 echo "Loading defaults"
261 config_foreach fw_defaults defaults
263 config_foreach fw_zone zone
265 config_foreach fw_rule rule
266 echo "Loading forwarding"
267 config_foreach fw_forwarding forwarding
268 echo "Loading redirects"
269 config_foreach fw_redirect redirect
270 echo "Loading includes"
271 config_foreach fw_include include
273 uci_set_state firewall core
"" firewall_state
274 uci_set_state firewall core loaded
1
277 config_foreach fw_addif interface
283 $IPTABLES -t mangle
-F
286 $IPTABLES -P INPUT ACCEPT
287 $IPTABLES -P OUTPUT ACCEPT
288 $IPTABLES -P FORWARD ACCEPT