config fw_zones
ZONE_LIST=$CONFIG_SECTION
+CUSTOM_CHAINS=1
DEF_INPUT=DROP
DEF_OUTPUT=DROP
DEF_FORWARD=DROP
config_get output $1 output
config_get forward $1 forward
- [ -z "$input" ] && input=$DEF_INPUT
- [ -z "$output" ] && output=$DEF_OUTPUT
- [ -z "$forward" ] && forward=$DEF_FORWARD
+ DEF_INPUT="${input:-$DEF_INPUT}"
+ DEF_OUTPUT="${output:-$DEF_OUTPUT}"
+ DEF_FORWARD="${forward:-$DEF_FORWARD}"
}
create_zone() {
$IPTABLES -N zone_$1_forward
$IPTABLES -A zone_$1_forward -j zone_$1_$5
$IPTABLES -A zone_$1 -j zone_$1_$3
- $IPTABLES -A OUTPUT -j zone_$1_$4
+ $IPTABLES -A output -j zone_$1_$4
$IPTABLES -N zone_$1_nat -t nat
$IPTABLES -N zone_$1_prerouting -t nat
[ "$6" == "1" ] && $IPTABLES -t nat -A POSTROUTING -j zone_$1_nat
[ -n "$dev" -a "$dev" != "$1" ] && delif "$dev" "$2"
[ -n "$dev" -a "$dev" == "$1" ] && return
logger "adding $1 to firewall zone $2"
- $IPTABLES -A INPUT -i $1 -j zone_$2
+ $IPTABLES -A input -i $1 -j zone_$2
$IPTABLES -I zone_$2_ACCEPT 1 -o $1 -j ACCEPT
$IPTABLES -I zone_$2_DROP 1 -o $1 -j DROP
- $IPTABLES -I zone_$2_REJECT 1 -o $1 -j REJECT
+ $IPTABLES -I zone_$2_REJECT 1 -o $1 -j reject
$IPTABLES -I zone_$2_ACCEPT 1 -i $1 -j ACCEPT
$IPTABLES -I zone_$2_DROP 1 -i $1 -j DROP
- $IPTABLES -I zone_$2_REJECT 1 -i $1 -j REJECT
+ $IPTABLES -I zone_$2_REJECT 1 -i $1 -j reject
$IPTABLES -I zone_$2_nat 1 -t nat -o $1 -j MASQUERADE
$IPTABLES -I PREROUTING 1 -t nat -i $1 -j zone_$2_prerouting
- $IPTABLES -A FORWARD -i $1 -j zone_$2_forward
+ $IPTABLES -A forward -i $1 -j zone_$2_forward
uci_set_state firewall core "$2" "$1"
}
delif() {
logger "removing $1 from firewall zone $2"
- $IPTABLES -D INPUT -i $1 -j zone_$2
+ $IPTABLES -D input -i $1 -j zone_$2
$IPTABLES -D zone_$2_ACCEPT -o $1 -j ACCEPT
$IPTABLES -D zone_$2_DROP -o $1 -j DROP
- $IPTABLES -D zone_$2_REJECT -o $1 -j REJECT
+ $IPTABLES -D zone_$2_REJECT -o $1 -j reject
$IPTABLES -D zone_$2_ACCEPT -i $1 -j ACCEPT
$IPTABLES -D zone_$2_DROP -i $1 -j DROP
- $IPTABLES -D zone_$2_REJECT -i $1 -j REJECT
+ $IPTABLES -D zone_$2_REJECT -i $1 -j reject
$IPTABLES -D zone_$2_nat -t nat -o $1 -j MASQUERADE
$IPTABLES -D PREROUTING -t nat -i $1 -j zone_$2_prerouting
- $IPTABLES -D FORWARD -i $1 -j zone_$2_forward
+ $IPTABLES -D forward -i $1 -j zone_$2_forward
uci_revert_state firewall core "$2"
}
load_synflood() {
+ local rate=${1:-25}
+ local burst=${2:-50}
echo "Loading synflood protection"
- $IPTABLES -N SYN_FLOOD
- $IPTABLES -A SYN_FLOOD -p tcp --syn -m limit --limit ${1}/second --limit-burst $2 -j RETURN
- $IPTABLES -A SYN_FLOOD -p ! tcp -j RETURN
- $IPTABLES -A SYN_FLOOD -p tcp ! --syn -j RETURN
- $IPTABLES -A SYN_FLOOD -j LOG --log-prefix "syn_flood: "
- $IPTABLES -A SYN_FLOOD -j DROP
- $IPTABLES -A INPUT -p tcp --syn -j SYN_FLOOD
+ $IPTABLES -N syn_flood
+ $IPTABLES -A syn_flood -p tcp --syn -m limit --limit $rate/second --limit-burst $burst -j RETURN
+ $IPTABLES -A syn_flood -j DROP
+ $IPTABLES -A INPUT -p tcp --syn -j syn_flood
+}
+
+fw_set_chain_policy() {
+ local chain=$1
+ local target=$2
+ [ "$target" == "REJECT" ] && {
+ $IPTABLES -A $chain -j reject
+ target=DROP
+ }
+ $IPTABLES -P $chain $target
}
fw_defaults() {
- load_policy $1
- DEF_INPUT=$input
- DEF_OUTPUT=$output
- DEF_FORWARD=$forward
+ [ -n "$DEFAULTS_APPLIED" ] && {
+ echo "Error: multiple defaults sections detected"
+ return;
+ }
+ DEFAULTS_APPLIED=1
+
+ load_policy "$1"
echo 1 > /proc/sys/net/ipv4/tcp_syncookies
for f in /proc/sys/net/ipv4/conf/*/accept_redirects
uci_revert_state firewall core
uci_set_state firewall core "" firewall_state
+ $IPTABLES -P INPUT DROP
+ $IPTABLES -P OUTPUT DROP
+ $IPTABLES -P FORWARD DROP
+
$IPTABLES -F
- $IPTABLES -t nat -F
$IPTABLES -t mangle -F
- $IPTABLES -X -t nat
+ $IPTABLES -t nat -F
+ $IPTABLES -t mangle -X
+ $IPTABLES -t nat -X
$IPTABLES -X
- $IPTABLES -P INPUT $input
$IPTABLES -A INPUT -m state --state INVALID -j DROP
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
- $IPTABLES -P OUTPUT $output
$IPTABLES -A OUTPUT -m state --state INVALID -j DROP
$IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
- $IPTABLES -P FORWARD $forward
$IPTABLES -A FORWARD -m state --state INVALID -j DROP
$IPTABLES -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
$IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
config_get syn_flood $1 syn_flood
config_get syn_rate $1 syn_rate
config_get syn_burst $1 syn_burst
-
- [ -z "$syn_rate" ] && syn_rate=25
- [ -z "$syn_burst" ] && syn_burst=50
[ "$syn_flood" == "1" ] && load_synflood $syn_rate $syn_burst
+
+ echo "Adding custom chains"
+ fw_custom_chains
+
+ $IPTABLES -N input
+ $IPTABLES -N output
+ $IPTABLES -N forward
+
+ $IPTABLES -A INPUT -j input
+ $IPTABLES -A OUTPUT -j output
+ $IPTABLES -A FORWARD -j forward
+
+ $IPTABLES -N reject
+ $IPTABLES -A reject -p tcp -j REJECT --reject-with tcp-reset
+ $IPTABLES -A reject -j REJECT --reject-with icmp-port-unreachable
+
+ fw_set_chain_policy INPUT "$DEF_INPUT"
+ fw_set_chain_policy OUTPUT "$DEF_OUTPUT"
+ fw_set_chain_policy FORWARD "$DEF_FORWARD"
}
fw_zone() {
[ -z "$network" ] && network=$name
create_zone "$name" "$network" "$input" "$output" "$forward" "$masq"
+ fw_custom_chains_zone "$name"
}
fw_rule() {
config_get proto $1 proto
config_get target $1 target
config_get ruleset $1 ruleset
-
+
+ ZONE=input
+ TARGET=$target
[ -z "$target" ] && target=DROP
- [ -n "$src" ] && ZONE=zone_$src || ZONE=INPUT
- [ -n "$dest" ] && TARGET=zone_${dest}_$target || TARGET=$target
+ [ -n "$src" -a -z "$dest" ] && ZONE=zone_$src
+ [ -n "$src" -a -n "$dest" ] && ZONE=zone_${src}_forward
+ [ -n "$dest" ] && TARGET=zone_${dest}_$target
add_rule() {
$IPTABLES -I $ZONE 1 \
${proto:+-p $proto} \
config_get src $1 src
config_get dest $1 dest
- [ -n "$src" ] && z_src=zone_${src}_forward || z_src=FORWARD
+ [ -n "$src" ] && z_src=zone_${src}_forward || z_src=forward
[ -n "$dest" ] && z_dest=zone_${dest}_ACCEPT || z_dest=ACCEPT
$IPTABLES -I $z_src 1 -j $z_dest
}
}
fw_custom_chains() {
+ [ -n "$CUSTOM_CHAINS" ] || return 0
$IPTABLES -N input_rule
$IPTABLES -N output_rule
$IPTABLES -N forwarding_rule
$IPTABLES -N prerouting_rule -t nat
$IPTABLES -N postrouting_rule -t nat
- $IPTABLES -N input_wan
- $IPTABLES -N forwarding_wan
- $IPTABLES -N prerouting_wan -t nat
$IPTABLES -A INPUT -j input_rule
$IPTABLES -A OUTPUT -j output_rule
$IPTABLES -A FORWARD -j forwarding_rule
$IPTABLES -A PREROUTING -t nat -j prerouting_rule
$IPTABLES -A POSTROUTING -t nat -j postrouting_rule
- $IPTABLES -A zone_wan -j input_wan
- $IPTABLES -A zone_wan_forward -j forwarding_wan
- $IPTABLES -A zone_wan_prerouting -t nat -j prerouting_wan
+}
+
+fw_custom_chains_zone() {
+ local zone="$1"
+
+ [ -n "$CUSTOM_CHAINS" ] || return 0
+ $IPTABLES -N input_${zone}
+ $IPTABLES -N forwarding_${zone}
+ $IPTABLES -N prerouting_${zone} -t nat
+ $IPTABLES -I zone_${zone} 1 -j input_${zone}
+ $IPTABLES -I zone_${zone}_forward 1 -j forwarding_${zone}
+ $IPTABLES -I zone_${zone}_prerouting 1 -t nat -j prerouting_${zone}
}
fw_init() {
+ DEFAULTS_APPLIED=
+
echo "Loading defaults"
config_foreach fw_defaults defaults
echo "Loading zones"
config_foreach fw_forwarding forwarding
echo "Loading redirects"
config_foreach fw_redirect redirect
- echo "Adding custom chains"
- fw_custom_chains
echo "Loading includes"
config_foreach fw_include include
uci_set_state firewall core loaded 1
fw_stop() {
$IPTABLES -F
- $IPTABLES -t nat -F
$IPTABLES -t mangle -F
- $IPTABLES -X -t nat
+ $IPTABLES -t nat -F
+ $IPTABLES -t mangle -X
+ $IPTABLES -t nat -X
$IPTABLES -X
$IPTABLES -P INPUT ACCEPT
$IPTABLES -P OUTPUT ACCEPT
projects / openwrt.git / blobdiff