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_MSSFIX
45 $IPTABLES -N zone_$1_ACCEPT
46 $IPTABLES -N zone_$1_DROP
47 $IPTABLES -N zone_$1_REJECT
48 $IPTABLES -N zone_$1_forward
49 $IPTABLES -A zone_$1_forward -j zone_$1_$5
50 $IPTABLES -A zone_$1 -j zone_$1_$3
51 $IPTABLES -A output -j zone_$1_$4
52 $IPTABLES -N zone_$1_nat -t nat
53 $IPTABLES -N zone_$1_prerouting -t nat
54 [ "$6" == "1" ] && $IPTABLES -t nat -A POSTROUTING -j zone_$1_nat
59 config_get dev core $2
60 [ -n "$dev" -a "$dev" != "$1" ] && delif "$dev" "$2"
61 [ -n "$dev" -a "$dev" == "$1" ] && return
62 logger "adding $1 to firewall zone $2"
63 $IPTABLES -A input -i $1 -j zone_$2
64 $IPTABLES -I zone_$2_MSSFIX 1 -o $1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
65 $IPTABLES -I zone_$2_ACCEPT 1 -o $1 -j ACCEPT
66 $IPTABLES -I zone_$2_DROP 1 -o $1 -j DROP
67 $IPTABLES -I zone_$2_REJECT 1 -o $1 -j reject
68 $IPTABLES -I zone_$2_ACCEPT 1 -i $1 -j ACCEPT
69 $IPTABLES -I zone_$2_DROP 1 -i $1 -j DROP
70 $IPTABLES -I zone_$2_REJECT 1 -i $1 -j reject
71 $IPTABLES -I zone_$2_nat 1 -t nat -o $1 -j MASQUERADE
72 $IPTABLES -I PREROUTING 1 -t nat -i $1 -j zone_$2_prerouting
73 $IPTABLES -A forward -i $1 -j zone_$2_forward
74 uci_set_state firewall core "$2" "$1"
78 logger "removing $1 from firewall zone $2"
79 $IPTABLES -D input -i $1 -j zone_$2
80 $IPTABLES -D zone_$2_MSSFIX -o $1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
81 $IPTABLES -D zone_$2_ACCEPT -o $1 -j ACCEPT
82 $IPTABLES -D zone_$2_DROP -o $1 -j DROP
83 $IPTABLES -D zone_$2_REJECT -o $1 -j reject
84 $IPTABLES -D zone_$2_ACCEPT -i $1 -j ACCEPT
85 $IPTABLES -D zone_$2_DROP -i $1 -j DROP
86 $IPTABLES -D zone_$2_REJECT -i $1 -j reject
87 $IPTABLES -D zone_$2_nat -t nat -o $1 -j MASQUERADE
88 $IPTABLES -D PREROUTING -t nat -i $1 -j zone_$2_prerouting
89 $IPTABLES -D forward -i $1 -j zone_$2_forward
90 uci_revert_state firewall core "$2"
96 echo "Loading synflood protection"
97 $IPTABLES -N syn_flood
98 $IPTABLES -A syn_flood -p tcp --syn -m limit --limit $rate/second --limit-burst $burst -j RETURN
99 $IPTABLES -A syn_flood -j DROP
100 $IPTABLES -A INPUT -p tcp --syn -j syn_flood
103 fw_set_chain_policy() {
106 [ "$target" == "REJECT" ] && {
107 $IPTABLES -A $chain -j reject
110 $IPTABLES -P $chain $target
114 [ -n "$DEFAULTS_APPLIED" ] && {
115 echo "Error: multiple defaults sections detected"
122 echo 1 > /proc/sys/net/ipv4/tcp_syncookies
123 for f in /proc/sys/net/ipv4/conf/*/accept_redirects
127 for f in /proc/sys/net/ipv4/conf/*/accept_source_route
132 uci_revert_state firewall core
133 uci_set_state firewall core "" firewall_state
135 $IPTABLES -P INPUT DROP
136 $IPTABLES -P OUTPUT DROP
137 $IPTABLES -P FORWARD DROP
140 $IPTABLES -t mangle -F
142 $IPTABLES -t mangle -X
146 $IPTABLES -A INPUT -m state --state INVALID -j DROP
147 $IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
149 $IPTABLES -A OUTPUT -m state --state INVALID -j DROP
150 $IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
152 $IPTABLES -A FORWARD -m state --state INVALID -j DROP
153 $IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
155 $IPTABLES -A INPUT -i lo -j ACCEPT
156 $IPTABLES -A OUTPUT -o lo -j ACCEPT
158 config_get syn_flood $1 syn_flood
159 config_get syn_rate $1 syn_rate
160 config_get syn_burst $1 syn_burst
161 [ "$syn_flood" == "1" ] && load_synflood $syn_rate $syn_burst
163 echo "Adding custom chains"
170 $IPTABLES -A INPUT -j input
171 $IPTABLES -A OUTPUT -j output
172 $IPTABLES -A FORWARD -j forward
175 $IPTABLES -A reject -p tcp -j REJECT --reject-with tcp-reset
176 $IPTABLES -A reject -j REJECT --reject-with icmp-port-unreachable
178 fw_set_chain_policy INPUT "$DEF_INPUT"
179 fw_set_chain_policy OUTPUT "$DEF_OUTPUT"
180 fw_set_chain_policy FORWARD "$DEF_FORWARD"
188 config_get name $1 name
189 config_get network $1 network
190 config_get masq $1 masq
193 [ -z "$network" ] && network=$name
194 create_zone "$name" "$network" "$input" "$output" "$forward" "$masq"
195 fw_custom_chains_zone "$name"
211 config_get src $1 src
212 config_get src_ip $1 src_ip
213 config_get src_mac $1 src_mac
214 config_get src_port $1 src_port
215 config_get dest $1 dest
216 config_get dest_ip $1 dest_ip
217 config_get dest_port $1 dest_port
218 config_get proto $1 proto
219 config_get target $1 target
220 config_get ruleset $1 ruleset
222 src_port_first=${src_port%-*}
223 src_port_last=${src_port#*-}
224 [ "$src_port_first" -ne "$src_port_last" ] && { \
225 src_port="$src_port_first:$src_port_last"; }
227 dest_port_first=${dest_port%-*}
228 dest_port_last=${dest_port#*-}
229 [ "$dest_port_first" -ne "$dest_port_last" ] && { \
230 dest_port="$dest_port_first:$dest_port_last"; }
234 [ -z "$target" ] && target=DROP
235 [ -n "$src" -a -z "$dest" ] && ZONE=zone_$src
236 [ -n "$src" -a -n "$dest" ] && ZONE=zone_${src}_forward
237 [ -n "$dest" ] && TARGET=zone_${dest}_$target
239 $IPTABLES -I $ZONE 1 \
240 ${proto:+-p $proto} \
241 ${src_ip:+-s $src_ip} \
242 ${src_port:+--sport $src_port} \
243 ${src_mac:+-m mac --mac-source $src_mac} \
244 ${dest_ip:+-d $dest_ip} \
245 ${dest_port:+--dport $dest_port} \
248 [ "$proto" == "tcpudp" -o -z "$proto" ] && {
263 config_get src $1 src
264 config_get dest $1 dest
265 config_get_bool mtu_fix $1 mtu_fix 0
266 [ -n "$src" ] && z_src=zone_${src}_forward || z_src=forward
267 [ -n "$dest" ] && z_dest=zone_${dest}_ACCEPT || z_dest=ACCEPT
268 $IPTABLES -I $z_src 1 -j $z_dest
269 [ "$mtu_fix" -gt 0 -a -n "$dest" ] && $IPTABLES -I $z_src 1 -j zone_${dest}_MSSFIX
279 local dest_port dest_port2
282 config_get src $1 src
283 config_get src_ip $1 src_ip
284 config_get src_port $1 src_port
285 config_get src_dport $1 src_dport
286 config_get src_mac $1 src_mac
287 config_get dest_ip $1 dest_ip
288 config_get dest_port $1 dest_port
289 config_get proto $1 proto
290 [ -z "$src" -o -z "$dest_ip" ] && { \
291 echo "redirect needs src and dest_ip"; return ; }
293 src_port_first=${src_port%-*}
294 src_port_last=${src_port#*-}
295 [ "$src_port_first" -ne "$src_port_last" ] && { \
296 src_port="$src_port_first:$src_port_last"; }
298 src_dport_first=${src_dport%-*}
299 src_dport_last=${src_dport#*-}
300 [ "$src_dport_first" -ne "$src_dport_last" ] && { \
301 src_dport="$src_dport_first:$src_dport_last"; }
303 dest_port2=$dest_port
304 dest_port_first=${dest_port2%-*}
305 dest_port_last=${dest_port2#*-}
306 [ "$dest_port_first" -ne "$dest_port_last" ] && { \
307 dest_port2="$dest_port_first:$dest_port_last"; }
310 $IPTABLES -A zone_${src}_prerouting -t nat \
311 ${proto:+-p $proto} \
312 ${src_ip:+-s $src_ip} \
313 ${src_port:+--sport $src_port} \
314 ${src_dport:+--dport $src_dport} \
315 ${src_mac:+-m mac --mac-source $src_mac} \
316 -j DNAT --to-destination $dest_ip${dest_port:+:$dest_port}
318 $IPTABLES -I zone_${src}_forward 1 \
319 ${proto:+-p $proto} \
321 ${src_ip:+-s $src_ip} \
322 ${src_port:+--sport $src_port} \
323 ${dest_port2:+--dport $dest_port2} \
324 ${src_mac:+-m mac --mac-source $src_mac} \
327 [ "$proto" == "tcpudp" -o -z "$proto" ] && {
339 config_get path $1 path
340 [ -e $path ] && . $path
347 config_get ifname $1 ifname
348 [ -n "$up" ] || return 0
349 (ACTION="ifup" INTERFACE="$1" . /etc/hotplug.d/iface/20-firewall)
353 [ -n "$CUSTOM_CHAINS" ] || return 0
354 $IPTABLES -N input_rule
355 $IPTABLES -N output_rule
356 $IPTABLES -N forwarding_rule
357 $IPTABLES -N prerouting_rule -t nat
358 $IPTABLES -N postrouting_rule -t nat
360 $IPTABLES -A INPUT -j input_rule
361 $IPTABLES -A OUTPUT -j output_rule
362 $IPTABLES -A FORWARD -j forwarding_rule
363 $IPTABLES -A PREROUTING -t nat -j prerouting_rule
364 $IPTABLES -A POSTROUTING -t nat -j postrouting_rule
367 fw_custom_chains_zone() {
370 [ -n "$CUSTOM_CHAINS" ] || return 0
371 $IPTABLES -N input_${zone}
372 $IPTABLES -N forwarding_${zone}
373 $IPTABLES -N prerouting_${zone} -t nat
374 $IPTABLES -I zone_${zone} 1 -j input_${zone}
375 $IPTABLES -I zone_${zone}_forward 1 -j forwarding_${zone}
376 $IPTABLES -I zone_${zone}_prerouting 1 -t nat -j prerouting_${zone}
382 echo "Loading defaults"
383 config_foreach fw_defaults defaults
385 config_foreach fw_zone zone
387 config_foreach fw_rule rule
388 echo "Loading forwarding"
389 config_foreach fw_forwarding forwarding
390 echo "Loading redirects"
391 config_foreach fw_redirect redirect
392 echo "Loading includes"
393 config_foreach fw_include include
394 uci_set_state firewall core loaded 1
397 config_foreach fw_addif interface
402 $IPTABLES -t mangle -F
404 $IPTABLES -t mangle -X
407 $IPTABLES -P INPUT ACCEPT
408 $IPTABLES -P OUTPUT ACCEPT
409 $IPTABLES -P FORWARD ACCEPT
410 uci_revert_state firewall core