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-rwxr-xr-xpackage/firewall/files/uci_firewall.sh285
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diff --git a/package/firewall/files/uci_firewall.sh b/package/firewall/files/uci_firewall.sh
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+#!/bin/sh
+# Copyright (C) 2008 John Crispin <blogic@openwrt.org>
+
+. /etc/functions.sh
+
+IPTABLES="echo iptables"
+IPTABLES=iptables
+
+config_clear
+include /lib/network
+scan_interfaces
+
+CONFIG_APPEND=1
+config_load firewall
+
+config fw_zones
+ZONE_LIST=$CONFIG_SECTION
+
+DEF_INPUT=DROP
+DEF_OUTPUT=DROP
+DEF_FORWARD=DROP
+
+load_policy() {
+ config_get input $1 input
+ 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
+}
+
+create_zone() {
+ local exists
+
+ [ "$1" == "loopback" ] && return
+
+ config_get exists $ZONE_LIST $1
+ [ -n "$exists" ] && return
+ config_set $ZONE_LIST $1 1
+
+ $IPTABLES -N zone_$1
+ $IPTABLES -N zone_$1_ACCEPT
+ $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
+ $IPTABLES -N zone_$1_nat -t nat
+ $IPTABLES -N zone_$1_prerouting -t nat
+ [ "$6" == "1" ] && $IPTABLES -t nat -A POSTROUTING -j zone_$2_nat
+}
+
+addif() {
+ logger "adding $1 to firewall 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_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_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
+}
+
+delif() {
+ logger "removing $1 from firewall 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_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_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
+}
+
+load_synflood() {
+ 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
+}
+
+fw_defaults() {
+ load_policy $1
+ DEF_INPUT=$input
+ DEF_OUTPUT=$output
+ DEF_FORWARD=$forward
+
+ echo 1 > /proc/sys/net/ipv4/tcp_syncookies
+ for f in /proc/sys/net/ipv4/conf/*/accept_redirects
+ do
+ echo 0 > $f
+ done
+ for f in /proc/sys/net/ipv4/conf/*/accept_source_route
+ do
+ echo 0 > $f
+ done
+
+ $IPTABLES -F
+ $IPTABLES -t nat -F
+ $IPTABLES -t mangle -F
+ $IPTABLES -X -t nat
+ $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
+
+ $IPTABLES -A INPUT -i lo -j ACCEPT
+ $IPTABLES -A OUTPUT -o lo -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
+}
+
+fw_zone() {
+ local name
+ local network
+ local masq
+
+ config_get name $1 name
+ config_get network $1 network
+ config_get masq $1 masq
+ load_policy $1
+
+ [ -z "$network" ] && network=$name
+ create_zone "$name" "$network" "$input" "$output" "$forward" "$masq"
+}
+
+fw_rule() {
+ local src
+ local src_ip
+ local src_mac
+ local src_port
+ local src_mac
+ local dest
+ local dest_ip
+ local dest_port
+ local proto
+ local target
+
+ config_get src $1 src
+ config_get src_ip $1 src_ip
+ config_get src_mac $1 src_mac
+ config_get src_port $1 src_port
+ config_get dest $1 dest
+ config_get dest_ip $1 dest_ip
+ config_get dest_port $1 dest_port
+ config_get proto $1 proto
+ config_get target $1 target
+ config_get ruleset $1 ruleset
+
+ [ -z "$target" ] && target=DROP
+ [ -n "$src" ] && ZONE=zone_$src || ZONE=INPUT
+ [ -n "$dest" ] && TARGET=zone_${dest}_$target || TARGET=$target
+ $IPTABLES -I $ZONE 1 \
+ ${proto:+-p $proto} \
+ ${src_ip:+-s $src_ip} \
+ ${src_port:+--sport $src_port} \
+ ${src_mac:+-m mac --mac-source $src_mac} \
+ ${dest_ip:+-d $dest_ip} \
+ ${dest_port:+--dport $dest_port} \
+ -j $TARGET
+}
+
+fw_forwarding() {
+ local src
+ local dest
+ local masq
+
+ config_get src $1 src
+ config_get dest $1 dest
+ [ -n "$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_redirect() {
+ local src
+ local src_ip
+ local src_port
+ local src_dport
+ local src_mac
+ local dest_ip
+ local dest_port
+ local protocol
+
+ config_get src $1 src
+ config_get src_ip $1 src_ip
+ config_get src_port $1 src_port
+ config_get src_dport $1 src_dport
+ config_get src_mac $1 src_mac
+ config_get dest_ip $1 dest_ip
+ config_get dest_port $1 dest_port
+ config_get protocol $1 protocol
+ [ -z "$src" -o -z "$dest_ip" ] && { \
+ echo "redirect needs src and dest_ip"; return ; }
+ $IPTABLES -A zone_${src}_prerouting -t nat \
+ ${protocol:+-p $protocol} \
+ ${src_ip:+-s $srcdip} \
+ ${src_port:+--sport $src_port} \
+ ${src_dport:+--dport $src_dport} \
+ ${src_mac:+-m mac --mac-source $src_mac} \
+ -j DNAT --to-destination $dest_ip${dest_port:+:$dest_port}
+ $IPTABLES -I zone_${src}_forward 1 \
+ ${protocol:+-p $protocol} \
+ -d $dest_ip \
+ ${src_ip:+-s $srcdip} \
+ ${src_port:+--sport $src_port} \
+ ${dest_port:+--dport $dest_port} \
+ ${src_mac:+-m mac --mac-source $src_mac} \
+ -j ACCEPT
+}
+
+fw_include() {
+ local path
+ config_get path $1 path
+ [ -e $path ] && . $path
+}
+
+fw_addif() {
+ local up
+ local ifname
+ config_get up $1 up
+ config_get ifname $1 ifname
+ [ -n "$up" ] || return 0
+ (ACTION="ifup" INTERFACE="$1" . /etc/hotplug.d/iface/20-firewall)
+}
+
+fw_init() {
+ echo "Loading defaults"
+ 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 includes"
+ config_foreach fw_include include
+
+ uci_set_state firewall core "" firewall_state
+ uci_set_state firewall core loaded 1
+ unset CONFIG_APPEND
+ config_load network
+ config_foreach fw_addif interface
+}
+
+fw_stop() {
+ $IPTABLES -F
+ $IPTABLES -t nat -F
+ $IPTABLES -t mangle -F
+ $IPTABLES -X -t nat
+ $IPTABLES -X
+ $IPTABLES -P INPUT ACCEPT
+ $IPTABLES -P OUTPUT ACCEPT
+ $IPTABLES -P FORWARD ACCEPT
+}