firewall: do not process rules in reverse

[openwrt.git] / package / firewall / files / uci_firewall.sh

diff --git a/package/firewall/files/uci_firewall.sh b/package/firewall/files/uci_firewall.sh
index f38bd6b..64e052f 100755 (executable)
--- a/package/firewall/files/uci_firewall.sh
+++ b/package/firewall/files/uci_firewall.sh
@@ -20,6 +20,16 @@ CUSTOM_CHAINS=1
 DEF_INPUT=DROP
 DEF_OUTPUT=DROP
 DEF_FORWARD=DROP
+CONNTRACK_ZONES=
+NOTRACK_DISABLED=
+
+find_item() {
+       local item="$1"; shift
+       for i in "$@"; do
+               [ "$i" = "$item" ] && return 0
+       done
+       return 1
+}
 
 load_policy() {
        config_get input $1 input
@@ -46,12 +56,14 @@ create_zone() {
        $IPTABLES -N zone_$1_DROP
        $IPTABLES -N zone_$1_REJECT
        $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
+       [ "$5" ] && $IPTABLES -A zone_$1_forward -j zone_$1_$5
+       [ "$3" ] && $IPTABLES -A zone_$1 -j zone_$1_$3
+       [ "$4" ] && $IPTABLES -A output -j zone_$1_$4
        $IPTABLES -N zone_$1_nat -t nat
        $IPTABLES -N zone_$1_prerouting -t nat
+       $IPTABLES -t raw -N zone_$1_notrack
        [ "$6" == "1" ] && $IPTABLES -t nat -A POSTROUTING -j zone_$1_nat
+       [ "$7" == "1" ] && $IPTABLES -I FORWARD 1 -j zone_$1_MSSFIX
 }
 
 addif() {
@@ -82,8 +94,10 @@ addif() {
        $IPTABLES -I zone_${zone}_nat 1 -t nat -o "$ifname" -j MASQUERADE 
        $IPTABLES -I PREROUTING 1 -t nat -i "$ifname" -j zone_${zone}_prerouting 
        $IPTABLES -A forward -i "$ifname" -j zone_${zone}_forward
+       $IPTABLES -t raw -I PREROUTING 1 -i "$ifname" -j zone_${zone}_notrack
        uci_set_state firewall core "${network}_ifname" "$ifname"
        uci_set_state firewall core "${network}_zone" "$zone"
+       ACTION=add ZONE="$zone" INTERFACE="$network" DEVICE="$ifname" /sbin/hotplug-call firewall
 }
 
 delif() {
@@ -105,6 +119,7 @@ delif() {
        $IPTABLES -D forward -i "$ifname" -j zone_${zone}_forward
        uci_revert_state firewall core "${network}_ifname"
        uci_revert_state firewall core "${network}_zone"
+       ACTION=remove ZONE="$zone" INTERFACE="$network" DEVICE="$ifname" /sbin/hotplug-call firewall
 }
 
 load_synflood() {
@@ -127,6 +142,15 @@ fw_set_chain_policy() {
        $IPTABLES -P $chain $target
 }
 
+fw_clear() {
+       $IPTABLES -F
+       $IPTABLES -t nat -F
+       $IPTABLES -t nat -X
+       $IPTABLES -t raw -F
+       $IPTABLES -t raw -X
+       $IPTABLES -X
+}
+
 fw_defaults() {
        [ -n "$DEFAULTS_APPLIED" ] && {
                echo "Error: multiple defaults sections detected"
@@ -153,19 +177,14 @@ fw_defaults() {
        $IPTABLES -P OUTPUT DROP
        $IPTABLES -P FORWARD DROP
 
-       $IPTABLES -F
-       $IPTABLES -t mangle -F
-       $IPTABLES -t nat -F
-       $IPTABLES -t mangle -X
-       $IPTABLES -t nat -X
-       $IPTABLES -X
-
-       config_get_bool drop_invalid $1 drop_invalid 1
+       fw_clear
+       config_get_bool drop_invalid $1 drop_invalid 0
 
        [ "$drop_invalid" -gt 0 ] && {
                $IPTABLES -A INPUT -m state --state INVALID -j DROP
                $IPTABLES -A OUTPUT -m state --state INVALID -j DROP
                $IPTABLES -A FORWARD -m state --state INVALID -j DROP
+               NOTRACK_DISABLED=1
        }
 
        $IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
@@ -207,11 +226,14 @@ fw_zone() {
 
        config_get name $1 name
        config_get network $1 network
-       config_get masq $1 masq
-       load_policy $1
+       config_get_bool masq $1 masq "0"
+       config_get_bool conntrack $1 conntrack "0"
+       config_get_bool mtu_fix $1 mtu_fix 0
 
+       load_policy $1
+       [ "$conntrack" = "1" -o "$masq" = "1" ] && append CONNTRACK_ZONES "$name"
        [ -z "$network" ] && network=$name
-       create_zone "$name" "$network" "$input" "$output" "$forward" "$masq"
+       create_zone "$name" "$network" "$input" "$output" "$forward" "$masq" "$mtu_fix"
        fw_custom_chains_zone "$name"
 }
 
@@ -225,6 +247,7 @@ fw_rule() {
        local dest_ip
        local dest_port
        local proto
+       local icmp_type
        local target
        local ruleset
 
@@ -236,6 +259,7 @@ fw_rule() {
        config_get dest_ip $1 dest_ip
        config_get dest_port $1 dest_port
        config_get proto $1 proto
+       config_get icmp_type $1 icmp_type
        config_get target $1 target
        config_get ruleset $1 ruleset
 
@@ -256,8 +280,9 @@ fw_rule() {
        [ -n "$src" -a -n "$dest" ] && ZONE=zone_${src}_forward
        [ -n "$dest" ] && TARGET=zone_${dest}_$target
        add_rule() {
-               $IPTABLES -I $ZONE 1 \
+               $IPTABLES -A $ZONE \
                        ${proto:+-p $proto} \
+                       ${icmp_type:+--icmp-type $icmp_type} \
                        ${src_ip:+-s $src_ip} \
                        ${src_port:+--sport $src_port} \
                        ${src_mac:+-m mac --mac-source $src_mac} \
@@ -282,11 +307,13 @@ fw_forwarding() {
 
        config_get src $1 src
        config_get dest $1 dest
-       config_get_bool mtu_fix $1 mtu_fix 0
        [ -n "$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 $z_dest
-       [ "$mtu_fix" -gt 0 -a -n "$dest" ] && $IPTABLES -I $z_src 1 -j zone_${dest}_MSSFIX
+
+       # propagate masq zone flag
+       find_item "$src" $CONNTRACK_ZONES && append CONNTRACK_ZONES $dest
+       find_item "$dest" $CONNTRACK_ZONES && append CONNTRACK_ZONES $src
 }
 
 fw_redirect() {
@@ -396,6 +423,14 @@ fw_custom_chains_zone() {
        $IPTABLES -I zone_${zone}_prerouting 1 -t nat -j prerouting_${zone}
 }
 
+fw_check_notrack() {
+       local zone="$1"
+       config_get name "$zone" name
+       [ -n "$NOTRACK_DISABLED" ] || \
+               find_item "$name" $CONNTRACK_ZONES || \
+               $IPTABLES -t raw -A zone_${name}_notrack -j NOTRACK
+}
+
 fw_init() {
        DEFAULTS_APPLIED=
 
@@ -403,29 +438,25 @@ fw_init() {
        config_foreach fw_defaults defaults
        echo "Loading zones"
        config_foreach fw_zone zone
-       echo "Loading rules"
-       config_foreach fw_rule rule
        echo "Loading forwarding"
        config_foreach fw_forwarding forwarding
        echo "Loading redirects"
        config_foreach fw_redirect redirect
+       echo "Loading rules"
+       config_foreach fw_rule rule
        echo "Loading includes"
        config_foreach fw_include include
        uci_set_state firewall core loaded 1
+       config_foreach fw_check_notrack zone
        unset CONFIG_APPEND
        config_load network
        config_foreach fw_addif interface
 }
 
 fw_stop() {
-       $IPTABLES -F
-       $IPTABLES -t mangle -F
-       $IPTABLES -t nat -F
-       $IPTABLES -t mangle -X
-       $IPTABLES -t nat -X
-       $IPTABLES -X
+       fw_clear
        $IPTABLES -P INPUT ACCEPT
        $IPTABLES -P OUTPUT ACCEPT
        $IPTABLES -P FORWARD ACCEPT
-       uci_revert_state firewall core
+       uci_revert_state firewall
 }