firewall: clear the MSSFIX rules

[openwrt/svn-archive/archive.git] / package / firewall / files / uci_firewall.sh

diff --git a/package/firewall/files/uci_firewall.sh b/package/firewall/files/uci_firewall.sh
index 884b596391a9fa57d3c7821ba34a088b366b140b..579a8a6c3a5beaa7f000b639a1cf92c45eaab59a 100755 (executable)
--- a/package/firewall/files/uci_firewall.sh
+++ b/package/firewall/files/uci_firewall.sh
@@ -16,6 +16,7 @@ config_load firewall
 config fw_zones
 ZONE_LIST=$CONFIG_SECTION
 
+CUSTOM_CHAINS=1
 DEF_INPUT=DROP
 DEF_OUTPUT=DROP
 DEF_FORWARD=DROP
@@ -25,9 +26,9 @@ load_policy() {
        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() {
@@ -40,6 +41,7 @@ create_zone() {
        config_set $ZONE_LIST $1 1 
 
        $IPTABLES -N zone_$1
+       $IPTABLES -N zone_$1_MSSFIX
        $IPTABLES -N zone_$1_ACCEPT
        $IPTABLES -N zone_$1_DROP
        $IPTABLES -N zone_$1_REJECT
@@ -59,6 +61,7 @@ addif() {
        [ -n "$dev" -a "$dev" == "$1" ] && return
        logger "adding $1 to firewall zone $2"
        $IPTABLES -A input -i $1 -j zone_$2
+       $IPTABLES -I zone_$2_MSSFIX 1 -o $1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
        $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
@@ -74,6 +77,7 @@ addif() {
 delif() {
        logger "removing $1 from firewall zone $2"
        $IPTABLES -D input -i $1 -j zone_$2
+       $IPTABLES -D zone_$2_MSSFIX -o $1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
        $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
@@ -107,10 +111,13 @@ fw_set_chain_policy() {
 }
 
 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 
@@ -143,7 +150,6 @@ fw_defaults() {
        $IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
        
        $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
        
        $IPTABLES -A INPUT -i lo -j ACCEPT
@@ -153,6 +159,9 @@ fw_defaults() {
        config_get syn_rate $1 syn_rate
        config_get syn_burst $1 syn_burst
        [ "$syn_flood" == "1" ] && load_synflood $syn_rate $syn_burst
+       
+       echo "Adding custom chains"
+       fw_custom_chains
 
        $IPTABLES -N input
        $IPTABLES -N output
@@ -165,6 +174,10 @@ fw_defaults() {
        $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() {
@@ -179,6 +192,7 @@ fw_zone() {
 
        [ -z "$network" ] && network=$name
        create_zone "$name" "$network" "$input" "$output" "$forward" "$masq"
+       fw_custom_chains_zone "$name"
 }
 
 fw_rule() {
@@ -205,9 +219,22 @@ fw_rule() {
        config_get target $1 target
        config_get ruleset $1 ruleset
 
+       src_port_first=${src_port%-*}
+       src_port_last=${src_port#*-}
+       [ "$src_port_first" -ne "$src_port_last" ] && { \
+               src_port="$src_port_first:$src_port_last"; }
+
+       dest_port_first=${dest_port%-*}
+       dest_port_last=${dest_port#*-}
+       [ "$dest_port_first" -ne "$dest_port_last" ] && { \
+               dest_port="$dest_port_first:$dest_port_last"; }
+       
+       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} \
@@ -235,9 +262,11 @@ 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
 }
 
 fw_redirect() {
@@ -321,26 +350,35 @@ fw_addif() {
 }
 
 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"
@@ -351,17 +389,12 @@ fw_init() {
        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
        unset CONFIG_APPEND
        config_load network
        config_foreach fw_addif interface
-       fw_set_chain_policy INPUT $input
-       fw_set_chain_policy OUTPUT $output
-       fw_set_chain_policy FORWARD $forward
 }
 
 fw_stop() {