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/ipv4/tcp_syncookies
120 for f in /proc/sys/net/ipv4/conf/*/accept_redirects
124 for f in /proc/sys/net/ipv4/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
161 echo "Adding custom chains"
168 $IPTABLES -A INPUT -j input
169 $IPTABLES -A OUTPUT -j output
170 $IPTABLES -A FORWARD -j forward
173 $IPTABLES -A reject -p tcp -j REJECT --reject-with tcp-reset
174 $IPTABLES -A reject -j REJECT --reject-with icmp-port-unreachable
176 fw_set_chain_policy INPUT "$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 $1 ruleset
222 [ -z "$target" ] && target=DROP
223 [ -n "$src" -a -z "$dest" ] && ZONE=zone_$src
224 [ -n "$src" -a -n "$dest" ] && ZONE=zone_${src}_forward
225 [ -n "$dest" ] && TARGET=zone_${dest}_$target
227 $IPTABLES -I $ZONE 1 \
228 ${proto:+-p $proto} \
229 ${src_ip:+-s $src_ip} \
230 ${src_port:+--sport $src_port} \
231 ${src_mac:+-m mac --mac-source $src_mac} \
232 ${dest_ip:+-d $dest_ip} \
233 ${dest_port:+--dport $dest_port} \
236 [ "$proto" == "tcpudp" -o -z "$proto" ] && {
251 config_get src $1 src
252 config_get dest $1 dest
253 [ -n "$src" ] && z_src=zone_${src}_forward || z_src=forward
254 [ -n "$dest" ] && z_dest=zone_${dest}_ACCEPT || z_dest=ACCEPT
255 $IPTABLES -I $z_src 1 -j $z_dest
265 local dest_port dest_port2
268 config_get src $1 src
269 config_get src_ip $1 src_ip
270 config_get src_port $1 src_port
271 config_get src_dport $1 src_dport
272 config_get src_mac $1 src_mac
273 config_get dest_ip $1 dest_ip
274 config_get dest_port $1 dest_port
275 config_get proto $1 proto
276 [ -z "$src" -o -z "$dest_ip" ] && { \
277 echo "redirect needs src and dest_ip"; return ; }
279 src_port_first=${src_port%-*}
280 src_port_last=${src_port#*-}
281 [ "$src_port_first" -ne "$src_port_last" ] && { \
282 src_port="$src_port_first:$src_port_last"; }
284 src_dport_first=${src_dport%-*}
285 src_dport_last=${src_dport#*-}
286 [ "$src_dport_first" -ne "$src_dport_last" ] && { \
287 src_dport="$src_dport_first:$src_dport_last"; }
289 dest_port2=$dest_port
290 dest_port_first=${dest_port2%-*}
291 dest_port_last=${dest_port2#*-}
292 [ "$dest_port_first" -ne "$dest_port_last" ] && { \
293 dest_port2="$dest_port_first:$dest_port_last"; }
296 $IPTABLES -A zone_${src}_prerouting -t nat \
297 ${proto:+-p $proto} \
298 ${src_ip:+-s $src_ip} \
299 ${src_port:+--sport $src_port} \
300 ${src_dport:+--dport $src_dport} \
301 ${src_mac:+-m mac --mac-source $src_mac} \
302 -j DNAT --to-destination $dest_ip${dest_port:+:$dest_port}
304 $IPTABLES -I zone_${src}_forward 1 \
305 ${proto:+-p $proto} \
307 ${src_ip:+-s $src_ip} \
308 ${src_port:+--sport $src_port} \
309 ${dest_port2:+--dport $dest_port2} \
310 ${src_mac:+-m mac --mac-source $src_mac} \
313 [ "$proto" == "tcpudp" -o -z "$proto" ] && {
325 config_get path $1 path
326 [ -e $path ] && . $path
333 config_get ifname $1 ifname
334 [ -n "$up" ] || return 0
335 (ACTION="ifup" INTERFACE="$1" . /etc/hotplug.d/iface/20-firewall)
339 [ -n "$CUSTOM_CHAINS" ] || return 0
340 $IPTABLES -N input_rule
341 $IPTABLES -N output_rule
342 $IPTABLES -N forwarding_rule
343 $IPTABLES -N prerouting_rule -t nat
344 $IPTABLES -N postrouting_rule -t nat
346 $IPTABLES -A INPUT -j input_rule
347 $IPTABLES -A OUTPUT -j output_rule
348 $IPTABLES -A FORWARD -j forwarding_rule
349 $IPTABLES -A PREROUTING -t nat -j prerouting_rule
350 $IPTABLES -A POSTROUTING -t nat -j postrouting_rule
353 fw_custom_chains_zone() {
356 [ -n "$CUSTOM_CHAINS" ] || return 0
357 $IPTABLES -N input_${zone}
358 $IPTABLES -N forwarding_${zone}
359 $IPTABLES -N prerouting_${zone} -t nat
360 $IPTABLES -I zone_${zone} 1 -j input_${zone}
361 $IPTABLES -I zone_${zone}_forward 1 -j forwarding_${zone}
362 $IPTABLES -I zone_${zone}_prerouting 1 -t nat -j prerouting_${zone}
368 echo "Loading defaults"
369 config_foreach fw_defaults defaults
371 config_foreach fw_zone zone
373 config_foreach fw_rule rule
374 echo "Loading forwarding"
375 config_foreach fw_forwarding forwarding
376 echo "Loading redirects"
377 config_foreach fw_redirect redirect
378 echo "Loading includes"
379 config_foreach fw_include include
380 uci_set_state firewall core loaded 1
383 config_foreach fw_addif interface
388 $IPTABLES -t mangle -F
390 $IPTABLES -t mangle -X
393 $IPTABLES -P INPUT ACCEPT
394 $IPTABLES -P OUTPUT ACCEPT
395 $IPTABLES -P FORWARD ACCEPT
396 uci_revert_state firewall core