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/ipv4/tcp_syncookies
101 for f in /proc/sys/net/ipv4/conf/*/accept_redirects
105 for f in /proc/sys/net/ipv4/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 $IPTABLES -I $ZONE 1 \
182 ${proto:+-p $proto} \
183 ${src_ip:+-s $src_ip} \
184 ${src_port:+--sport $src_port} \
185 ${src_mac:+-m mac --mac-source $src_mac} \
186 ${dest_ip:+-d $dest_ip} \
187 ${dest_port:+--dport $dest_port} \
196 config_get src $1 src
197 config_get dest $1 dest
198 [ -n "$src" ] && z_src=zone_${src}_forward || z_src=FORWARD
199 [ -n "$dest" ] && z_dest=zone_${dest}_ACCEPT || z_dest=ACCEPT
200 $IPTABLES -I $z_src 1 -j $z_dest
213 config_get src $1 src
214 config_get src_ip $1 src_ip
215 config_get src_port $1 src_port
216 config_get src_dport $1 src_dport
217 config_get src_mac $1 src_mac
218 config_get dest_ip $1 dest_ip
219 config_get dest_port $1 dest_port
220 config_get protocol $1 protocol
221 [ -z "$src" -o -z "$dest_ip" ] && { \
222 echo "redirect needs src and dest_ip"; return ; }
223 $IPTABLES -A zone_${src}_prerouting -t nat \
224 ${protocol:+-p $protocol} \
225 ${src_ip:+-s $srcdip} \
226 ${src_port:+--sport $src_port} \
227 ${src_dport:+--dport $src_dport} \
228 ${src_mac:+-m mac --mac-source $src_mac} \
229 -j DNAT --to-destination $dest_ip${dest_port:+:$dest_port}
230 $IPTABLES -I zone_${src}_forward 1 \
231 ${protocol:+-p $protocol} \
233 ${src_ip:+-s $srcdip} \
234 ${src_port:+--sport $src_port} \
235 ${dest_port:+--dport $dest_port} \
236 ${src_mac:+-m mac --mac-source $src_mac} \
242 config_get path $1 path
243 [ -e $path ] && . $path
250 config_get ifname $1 ifname
251 [ -n "$up" ] || return 0
252 (ACTION="ifup" INTERFACE="$1" . /etc/hotplug.d/iface/20-firewall)
256 echo "Loading defaults"
257 config_foreach fw_defaults defaults
259 config_foreach fw_zone zone
261 config_foreach fw_rule rule
262 echo "Loading forwarding"
263 config_foreach fw_forwarding forwarding
264 echo "Loading redirects"
265 config_foreach fw_redirect redirect
266 echo "Loading includes"
267 config_foreach fw_include include
269 uci_set_state firewall core "" firewall_state
270 uci_set_state firewall core loaded 1
273 config_foreach fw_addif interface
279 $IPTABLES -t mangle -F
282 $IPTABLES -P INPUT ACCEPT
283 $IPTABLES -P OUTPUT ACCEPT
284 $IPTABLES -P FORWARD ACCEPT