2 # Copyright (C) 2008 John Crispin <blogic@openwrt.org>
6 IPTABLES
="echo iptables"
17 ZONE_LIST
=$CONFIG_SECTION
25 config_get input
$1 input
26 config_get output
$1 output
27 config_get forward
$1 forward
29 DEF_INPUT
="${input:-$DEF_INPUT}"
30 DEF_OUTPUT
="${output:-$DEF_OUTPUT}"
31 DEF_FORWARD
="${forward:-$DEF_FORWARD}"
37 [ "$1" == "loopback" ] && return
39 config_get exists
$ZONE_LIST $1
40 [ -n "$exists" ] && return
41 config_set
$ZONE_LIST $1 1
44 $IPTABLES -N zone_
$1_ACCEPT
45 $IPTABLES -N zone_
$1_DROP
46 $IPTABLES -N zone_
$1_REJECT
47 $IPTABLES -N zone_
$1_forward
48 $IPTABLES -A zone_
$1_forward -j zone_
$1_$5
49 $IPTABLES -A zone_
$1 -j zone_
$1_$3
50 $IPTABLES -A output
-j zone_
$1_$4
51 $IPTABLES -N zone_
$1_nat -t nat
52 $IPTABLES -N zone_
$1_prerouting -t nat
53 [ "$6" == "1" ] && $IPTABLES -t nat
-A POSTROUTING
-j zone_
$1_nat
58 config_get dev core
$2
59 [ -n "$dev" -a "$dev" != "$1" ] && delif
"$dev" "$2"
60 [ -n "$dev" -a "$dev" == "$1" ] && return
61 logger
"adding $1 to firewall zone $2"
62 $IPTABLES -A input
-i $1 -j zone_
$2
63 $IPTABLES -I zone_
$2_ACCEPT 1 -o $1 -j ACCEPT
64 $IPTABLES -I zone_
$2_DROP 1 -o $1 -j DROP
65 $IPTABLES -I zone_
$2_REJECT 1 -o $1 -j reject
66 $IPTABLES -I zone_
$2_ACCEPT 1 -i $1 -j ACCEPT
67 $IPTABLES -I zone_
$2_DROP 1 -i $1 -j DROP
68 $IPTABLES -I zone_
$2_REJECT 1 -i $1 -j reject
69 $IPTABLES -I zone_
$2_nat 1 -t nat
-o $1 -j MASQUERADE
70 $IPTABLES -I PREROUTING
1 -t nat
-i $1 -j zone_
$2_prerouting
71 $IPTABLES -A forward
-i $1 -j zone_
$2_forward
72 uci_set_state firewall core
"$2" "$1"
76 logger
"removing $1 from firewall zone $2"
77 $IPTABLES -D input
-i $1 -j zone_
$2
78 $IPTABLES -D zone_
$2_ACCEPT -o $1 -j ACCEPT
79 $IPTABLES -D zone_
$2_DROP -o $1 -j DROP
80 $IPTABLES -D zone_
$2_REJECT -o $1 -j reject
81 $IPTABLES -D zone_
$2_ACCEPT -i $1 -j ACCEPT
82 $IPTABLES -D zone_
$2_DROP -i $1 -j DROP
83 $IPTABLES -D zone_
$2_REJECT -i $1 -j reject
84 $IPTABLES -D zone_
$2_nat -t nat
-o $1 -j MASQUERADE
85 $IPTABLES -D PREROUTING
-t nat
-i $1 -j zone_
$2_prerouting
86 $IPTABLES -D forward
-i $1 -j zone_
$2_forward
87 uci_revert_state firewall core
"$2"
93 echo "Loading synflood protection"
94 $IPTABLES -N syn_flood
95 $IPTABLES -A syn_flood
-p tcp
--syn -m limit
--limit $rate/second
--limit-burst $burst -j RETURN
96 $IPTABLES -A syn_flood
-j DROP
97 $IPTABLES -A INPUT
-p tcp
--syn -j syn_flood
100 fw_set_chain_policy
() {
103 [ "$target" == "REJECT" ] && {
104 $IPTABLES -A $chain -j reject
107 $IPTABLES -P $chain $target
111 [ -n "$DEFAULTS_APPLIED" ] && {
112 echo "Error: multiple defaults sections detected"
119 echo 1 > /proc
/sys
/net
/ipv
4/tcp_syncookies
120 for f
in /proc
/sys
/net
/ipv
4/conf
/*/accept_redirects
124 for f
in /proc
/sys
/net
/ipv
4/conf
/*/accept_source_route
129 uci_revert_state firewall core
130 uci_set_state firewall core
"" firewall_state
132 $IPTABLES -P INPUT DROP
133 $IPTABLES -P OUTPUT DROP
134 $IPTABLES -P FORWARD DROP
137 $IPTABLES -t mangle
-F
139 $IPTABLES -t mangle
-X
143 $IPTABLES -A INPUT
-m state
--state INVALID
-j DROP
144 $IPTABLES -A INPUT
-m state
--state RELATED
,ESTABLISHED
-j ACCEPT
146 $IPTABLES -A OUTPUT
-m state
--state INVALID
-j DROP
147 $IPTABLES -A OUTPUT
-m state
--state RELATED
,ESTABLISHED
-j ACCEPT
149 $IPTABLES -A FORWARD
-m state
--state INVALID
-j DROP
150 $IPTABLES -A FORWARD
-p tcp
--tcp-flags SYN
,RST SYN
-j TCPMSS
--clamp-mss-to-pmtu
151 $IPTABLES -A FORWARD
-m state
--state RELATED
,ESTABLISHED
-j ACCEPT
153 $IPTABLES -A INPUT
-i lo
-j ACCEPT
154 $IPTABLES -A OUTPUT
-o lo
-j ACCEPT
156 config_get syn_flood
$1 syn_flood
157 config_get syn_rate
$1 syn_rate
158 config_get syn_burst
$1 syn_burst
159 [ "$syn_flood" == "1" ] && load_synflood
$syn_rate $syn_burst
165 $IPTABLES -A INPUT
-j input
166 $IPTABLES -A OUTPUT
-j output
167 $IPTABLES -A FORWARD
-j forward
170 $IPTABLES -A reject
-p tcp
-j REJECT
--reject-with tcp-reset
171 $IPTABLES -A reject
-j REJECT
--reject-with icmp-port-unreachable
173 echo "Adding custom chains"
176 fw_set_chain_policy INPUT
"$DEF_INPUT"
177 fw_set_chain_policy OUTPUT
"$DEF_OUTPUT"
178 fw_set_chain_policy FORWARD
"$DEF_FORWARD"
186 config_get name
$1 name
187 config_get network
$1 network
188 config_get masq
$1 masq
191 [ -z "$network" ] && network
=$name
192 create_zone
"$name" "$network" "$input" "$output" "$forward" "$masq"
193 fw_custom_chains_zone
"$name"
209 config_get src
$1 src
210 config_get src_ip
$1 src_ip
211 config_get src_mac
$1 src_mac
212 config_get src_port
$1 src_port
213 config_get dest
$1 dest
214 config_get dest_ip
$1 dest_ip
215 config_get dest_port
$1 dest_port
216 config_get proto
$1 proto
217 config_get target
$1 target
218 config_get ruleset
$1 ruleset
220 [ -z "$target" ] && target
=DROP
221 [ -n "$src" ] && ZONE
=zone_
$src || ZONE
=input
222 [ -n "$dest" ] && TARGET
=zone_
${dest}_
$target || TARGET
=$target
224 $IPTABLES -I $ZONE 1 \
225 ${proto:+-p $proto} \
226 ${src_ip:+-s $src_ip} \
227 ${src_port:+--sport $src_port} \
228 ${src_mac:+-m mac --mac-source $src_mac} \
229 ${dest_ip:+-d $dest_ip} \
230 ${dest_port:+--dport $dest_port} \
233 [ "$proto" == "tcpudp" -o -z "$proto" ] && {
248 config_get src
$1 src
249 config_get dest
$1 dest
250 [ -n "$src" ] && z_src
=zone_
${src}_forward || z_src
=forward
251 [ -n "$dest" ] && z_dest
=zone_
${dest}_ACCEPT || z_dest
=ACCEPT
252 $IPTABLES -I $z_src 1 -j $z_dest
262 local dest_port dest_port2
265 config_get src
$1 src
266 config_get src_ip
$1 src_ip
267 config_get src_port
$1 src_port
268 config_get src_dport
$1 src_dport
269 config_get src_mac
$1 src_mac
270 config_get dest_ip
$1 dest_ip
271 config_get dest_port
$1 dest_port
272 config_get proto
$1 proto
273 [ -z "$src" -o -z "$dest_ip" ] && { \
274 echo "redirect needs src and dest_ip"; return ; }
276 src_port_first
=${src_port%-*}
277 src_port_last
=${src_port#*-}
278 [ "$src_port_first" -ne "$src_port_last" ] && { \
279 src_port
="$src_port_first:$src_port_last"; }
281 src_dport_first
=${src_dport%-*}
282 src_dport_last
=${src_dport#*-}
283 [ "$src_dport_first" -ne "$src_dport_last" ] && { \
284 src_dport
="$src_dport_first:$src_dport_last"; }
286 dest_port2
=$dest_port
287 dest_port_first
=${dest_port2%-*}
288 dest_port_last
=${dest_port2#*-}
289 [ "$dest_port_first" -ne "$dest_port_last" ] && { \
290 dest_port2
="$dest_port_first:$dest_port_last"; }
293 $IPTABLES -A zone_
${src}_prerouting
-t nat \
294 ${proto:+-p $proto} \
295 ${src_ip:+-s $src_ip} \
296 ${src_port:+--sport $src_port} \
297 ${src_dport:+--dport $src_dport} \
298 ${src_mac:+-m mac --mac-source $src_mac} \
299 -j DNAT
--to-destination $dest_ip${dest_port:+:$dest_port}
301 $IPTABLES -I zone_
${src}_forward
1 \
302 ${proto:+-p $proto} \
304 ${src_ip:+-s $src_ip} \
305 ${src_port:+--sport $src_port} \
306 ${dest_port2:+--dport $dest_port2} \
307 ${src_mac:+-m mac --mac-source $src_mac} \
310 [ "$proto" == "tcpudp" -o -z "$proto" ] && {
322 config_get path
$1 path
323 [ -e $path ] && .
$path
330 config_get ifname
$1 ifname
331 [ -n "$up" ] ||
return 0
332 (ACTION
="ifup" INTERFACE
="$1" .
/etc
/hotplug.d
/iface
/20-firewall)
336 [ -n "$CUSTOM_CHAINS" ] ||
return 0
337 $IPTABLES -N input_rule
338 $IPTABLES -N output_rule
339 $IPTABLES -N forwarding_rule
340 $IPTABLES -N prerouting_rule
-t nat
341 $IPTABLES -N postrouting_rule
-t nat
343 $IPTABLES -A INPUT
-j input_rule
344 $IPTABLES -A OUTPUT
-j output_rule
345 $IPTABLES -A FORWARD
-j forwarding_rule
346 $IPTABLES -A PREROUTING
-t nat
-j prerouting_rule
347 $IPTABLES -A POSTROUTING
-t nat
-j postrouting_rule
350 fw_custom_chains_zone
() {
353 [ -n "$CUSTOM_CHAINS" ] ||
return 0
354 $IPTABLES -N input_
${zone}
355 $IPTABLES -N forwarding_
${zone}
356 $IPTABLES -N prerouting_
${zone} -t nat
357 $IPTABLES -A zone_
${zone} -j input_
${zone}
358 $IPTABLES -A zone_
${zone}_forward
-j forwarding_
${zone}
359 $IPTABLES -A zone_
${zone}_prerouting
-t nat
-j prerouting_
${zone}
365 echo "Loading defaults"
366 config_foreach fw_defaults defaults
368 config_foreach fw_zone zone
370 config_foreach fw_rule rule
371 echo "Loading forwarding"
372 config_foreach fw_forwarding forwarding
373 echo "Loading redirects"
374 config_foreach fw_redirect redirect
375 echo "Loading includes"
376 config_foreach fw_include include
377 uci_set_state firewall core loaded
1
380 config_foreach fw_addif interface
385 $IPTABLES -t mangle
-F
387 $IPTABLES -t mangle
-X
390 $IPTABLES -P INPUT ACCEPT
391 $IPTABLES -P OUTPUT ACCEPT
392 $IPTABLES -P FORWARD ACCEPT
393 uci_revert_state firewall core