+++ /dev/null
-#!/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
-ZONE_NAMES=
-
-CUSTOM_CHAINS=1
-DEF_INPUT=DROP
-DEF_OUTPUT=DROP
-DEF_FORWARD=DROP
-CONNTRACK_ZONES=
-NOTRACK_DISABLED=
-
-add_state() {
- local var="$1"
- local item="$2"
-
- local val="$(uci_get_state firewall core $var)"
- uci_set_state firewall core $var "${val:+$val }$item"
-}
-
-del_state() {
- local var="$1"
- local item="$2"
-
- local val=" $(uci_get_state firewall core $var) "
- val="${val// $item / }"
- val="${val# }"
- val="${val% }"
- uci_set_state firewall core $var "$val"
-}
-
-find_item() {
- local item="$1"; shift
- for i in "$@"; do
- [ "$i" = "$item" ] && return 0
- done
- return 1
-}
-
-get_portrange() {
- local _var="$1"
- local _range="$2"
- local _delim="${3:-:}"
-
- local _min="${_range%%[:-]*}"
- local _max="${_range##*[:-]}"
-
- [ -n "$_min" ] && [ -n "$_max" ] && [ "$_min" != "$_max" ] && \
- export -n -- "$_var=$_min$_delim$_max" || \
- export -n -- "$_var=${_min:-$_max}"
-}
-
-get_negation() {
- local _var="$1"
- local _flag="$2"
- local _ipaddr="$3"
-
- [ "${_ipaddr#!}" != "$_ipaddr" ] && \
- export -n -- "$_var=! $_flag ${_ipaddr#!}" || \
- export -n -- "$_var=${_ipaddr:+$_flag $_ipaddr}"
-}
-
-load_policy() {
- config_get input $1 input
- config_get output $1 output
- config_get forward $1 forward
-
- DEF_INPUT="${input:-$DEF_INPUT}"
- DEF_OUTPUT="${output:-$DEF_OUTPUT}"
- DEF_FORWARD="${forward:-$DEF_FORWARD}"
-}
-
-create_zone() {
- local name="$1"
- local network="$2"
- local input="$3"
- local output="$4"
- local forward="$5"
- local mtu_fix="$6"
- local masq="$7"
- local masq_src="$8"
- local masq_dest="$9"
-
- local exists
-
- [ "$name" == "loopback" ] && return
-
- config_get exists $ZONE_LIST $name
- [ -n "$exists" ] && return
- config_set $ZONE_LIST $name 1
-
- $IPTABLES -N zone_${name}
- $IPTABLES -N zone_${name}_MSSFIX
- $IPTABLES -N zone_${name}_ACCEPT
- $IPTABLES -N zone_${name}_DROP
- $IPTABLES -N zone_${name}_REJECT
- $IPTABLES -N zone_${name}_forward
- [ "$output" ] && $IPTABLES -A output -j zone_${name}_${output}
- $IPTABLES -N zone_${name}_nat -t nat
- $IPTABLES -N zone_${name}_prerouting -t nat
- $IPTABLES -t raw -N zone_${name}_notrack
- [ "$mtu_fix" == "1" ] && $IPTABLES -I FORWARD 1 -j zone_${name}_MSSFIX
-
- if [ "$masq" == "1" ]; then
- local msrc mdst
- for msrc in ${masq_src:-0.0.0.0/0}; do
- get_negation msrc '-s' "$msrc"
- for mdst in ${masq_dest:-0.0.0.0/0}; do
- get_negation mdst '-d' "$mdst"
- $IPTABLES -A zone_${name}_nat -t nat $msrc $mdst -j MASQUERADE
- done
- done
- fi
-
- append ZONE_NAMES "$name"
-}
-
-
-addif() {
- local network="$1"
- local ifname="$2"
- local zone="$3"
-
- local n_if n_zone
- config_get n_if core "${network}_ifname"
- config_get n_zone core "${network}_zone"
- [ -n "$n_zone" ] && {
- if [ "$n_zone" != "$zone" ]; then
- delif "$network" "$n_if" "$n_zone"
- else
- return
- fi
- }
-
- logger "adding $network ($ifname) to firewall zone $zone"
- $IPTABLES -A input -i "$ifname" -j zone_${zone}
- $IPTABLES -I zone_${zone}_MSSFIX 1 -o "$ifname" -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
- $IPTABLES -I zone_${zone}_ACCEPT 1 -o "$ifname" -j ACCEPT
- $IPTABLES -I zone_${zone}_DROP 1 -o "$ifname" -j DROP
- $IPTABLES -I zone_${zone}_REJECT 1 -o "$ifname" -j reject
- $IPTABLES -I zone_${zone}_ACCEPT 1 -i "$ifname" -j ACCEPT
- $IPTABLES -I zone_${zone}_DROP 1 -i "$ifname" -j DROP
- $IPTABLES -I zone_${zone}_REJECT 1 -i "$ifname" -j reject
-
- $IPTABLES -I PREROUTING 1 -t nat -i "$ifname" -j zone_${zone}_prerouting
- $IPTABLES -I POSTROUTING 1 -t nat -o "$ifname" -j zone_${zone}_nat
- $IPTABLES -A forward -i "$ifname" -j zone_${zone}_forward
- $IPTABLES -I PREROUTING 1 -t raw -i "$ifname" -j zone_${zone}_notrack
-
- uci_set_state firewall core "${network}_ifname" "$ifname"
- uci_set_state firewall core "${network}_zone" "$zone"
-
- add_state "${zone}_networks" "$network"
-
- ACTION=add ZONE="$zone" INTERFACE="$network" DEVICE="$ifname" /sbin/hotplug-call firewall
-}
-
-delif() {
- local network="$1"
- local ifname="$2"
- local zone="$3"
-
- logger "removing $network ($ifname) from firewall zone $zone"
- $IPTABLES -D input -i "$ifname" -j zone_$zone
- $IPTABLES -D zone_${zone}_MSSFIX -o "$ifname" -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
- $IPTABLES -D zone_${zone}_ACCEPT -o "$ifname" -j ACCEPT
- $IPTABLES -D zone_${zone}_DROP -o "$ifname" -j DROP
- $IPTABLES -D zone_${zone}_REJECT -o "$ifname" -j reject
- $IPTABLES -D zone_${zone}_ACCEPT -i "$ifname" -j ACCEPT
- $IPTABLES -D zone_${zone}_DROP -i "$ifname" -j DROP
- $IPTABLES -D zone_${zone}_REJECT -i "$ifname" -j reject
-
- $IPTABLES -D PREROUTING -t nat -i "$ifname" -j zone_${zone}_prerouting
- $IPTABLES -D POSTROUTING -t nat -o "$ifname" -j zone_${zone}_nat
- $IPTABLES -D forward -i "$ifname" -j zone_${zone}_forward
- $IPTABLES -D PREROUTING -t raw -i "$ifname" -j zone_${zone}_notrack
-
- uci_revert_state firewall core "${network}_ifname"
- uci_revert_state firewall core "${network}_zone"
-
- del_state "${zone}_networks" "$network"
-
- ACTION=remove ZONE="$zone" INTERFACE="$network" DEVICE="$ifname" /sbin/hotplug-call firewall
-}
-
-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 $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_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"
- 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
- do
- echo 0 > $f
- done
- for f in /proc/sys/net/ipv4/conf/*/accept_source_route
- do
- echo 0 > $f
- done
-
- uci_revert_state firewall core
- uci_set_state firewall core "" firewall_state
-
- $IPTABLES -P INPUT DROP
- $IPTABLES -P OUTPUT DROP
- $IPTABLES -P FORWARD DROP
-
- 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
- $IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
- $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 $1 syn_burst
- [ "$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_defaults() {
- local name
- local network
- local masq
-
- config_get name $1 name
- config_get network $1 network
- 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 $1
- [ "$forward" ] && $IPTABLES -A zone_${name}_forward -j zone_${name}_${forward}
- [ "$input" ] && $IPTABLES -A zone_${name} -j zone_${name}_${input}
-}
-
-fw_zone() {
- local name
- local network
- local mtu_fix
- local conntrack
- local masq
- local masq_src
- local masq_dest
-
- config_get name $1 name
- config_get network $1 network
- config_get_bool masq $1 masq "0"
- config_get_bool conntrack $1 conntrack "0"
- config_get_bool mtu_fix $1 mtu_fix 0
- config_get masq_src $1 masq_src
- config_get masq_dest $1 masq_dest
-
- load_policy $1
- [ "$conntrack" = "1" -o "$masq" = "1" ] && append CONNTRACK_ZONES "$name"
- [ -z "$network" ] && network=$name
-
- create_zone "$name" "$network" "$input" "$output" "$forward" "$mtu_fix" \
- "$masq" "$masq_src" "$masq_dest"
-
- fw_custom_chains_zone "$name"
-}
-
-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 icmp_type
- local target
- local ruleset
-
- 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 icmp_type $1 icmp_type
- config_get target $1 target
- config_get ruleset $1 ruleset
-
- [ "$target" != "NOTRACK" ] || [ -n "$src" ] || {
- echo "NOTRACK rule needs src"
- return
- }
-
- local srcaddr destaddr
- get_negation srcaddr '-s' "$src_ip"
- get_negation destaddr '-d' "$dest_ip"
-
- local srcports destports
- get_portrange srcports "$src_port" ":"
- get_portrange destports "$dest_port" ":"
-
- ZONE=input
- TABLE=filter
- TARGET="${target:-DROP}"
-
- if [ "$TARGET" = "NOTRACK" ]; then
- TABLE=raw
- ZONE="zone_${src}_notrack"
- else
- [ -n "$src" ] && ZONE="zone_${src}${dest:+_forward}"
- [ -n "$dest" ] && TARGET="zone_${dest}_${TARGET}"
- fi
-
- add_rule() {
- local pos
- eval 'pos=$((++FW__RULE_COUNT_'$ZONE'))'
-
- $IPTABLES -t $TABLE -I $ZONE $pos \
- $srcaddr $destaddr \
- ${proto:+-p $proto} \
- ${icmp_type:+--icmp-type $icmp_type} \
- ${srcports:+--sport $srcports} \
- ${src_mac:+-m mac --mac-source $src_mac} \
- ${destports:+--dport $destports} \
- -j $TARGET
- }
-
- [ "$proto" == "tcpudp" ] && proto="tcp udp"
- for proto in ${proto:-tcp udp}; do
- add_rule
- done
-}
-
-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 $z_dest
-
- # propagate masq zone flag
- find_item "$src" $CONNTRACK_ZONES && append CONNTRACK_ZONES $dest
- find_item "$dest" $CONNTRACK_ZONES && append CONNTRACK_ZONES $src
-}
-
-fw_redirect() {
- local src
- local src_ip
- local src_dip
- local src_port
- local src_dport
- 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_dip $1 src_dip
- config_get src_port $1 src_port
- config_get src_dport $1 src_dport
- config_get src_mac $1 src_mac
- 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 $1 target
-
- local fwdchain natchain natopt nataddr natports srcdaddr srcdports
- if [ "${target:-DNAT}" == "DNAT" ]; then
- [ -n "$src" -a -n "$dest_ip$dest_port" ] || {
- echo "DNAT redirect needs src and dest_ip or dest_port"
- return
- }
-
- fwdchain="zone_${src}_forward"
-
- natopt="--to-destination"
- natchain="zone_${src}_prerouting"
- nataddr="$dest_ip"
- get_portrange natports "$dest_port" "-"
-
- get_negation srcdaddr '-d' "$src_dip"
- get_portrange srcdports "$src_dport" ":"
-
- find_item "$src" $CONNTRACK_ZONES || \
- append CONNTRACK_ZONES "$src"
-
- elif [ "$target" == "SNAT" ]; then
- [ -n "$dest" -a -n "$src_dip" ] || {
- echo "SNAT redirect needs dest and src_dip"
- return
- }
-
- fwdchain="${src:+zone_${src}_forward}"
-
- natopt="--to-source"
- natchain="zone_${dest}_nat"
- nataddr="$src_dip"
- get_portrange natports "$src_dport" "-"
-
- get_negation srcdaddr '-d' "$dest_ip"
- get_portrange srcdports "$dest_port" ":"
-
- find_item "$dest" $CONNTRACK_ZONES || \
- append CONNTRACK_ZONES "$dest"
-
- else
- echo "redirect target must be either DNAT or SNAT"
- return
- fi
-
- local srcaddr destaddr
- get_negation srcaddr '-s' "$src_ip"
- get_negation destaddr '-d' "$dest_ip"
-
- local srcports destports
- get_portrange srcports "$src_port" ":"
- get_portrange destports "${dest_port-$src_dport}" ":"
-
- add_rule() {
- local pos
- eval 'pos=$((++FW__REDIR_COUNT_'$natchain'))'
-
- $IPTABLES -I $natchain $pos -t nat \
- $srcaddr $srcdaddr \
- ${proto:+-p $proto} \
- ${srcports:+--sport $srcports} \
- ${srcdports:+--dport $srcdports} \
- ${src_mac:+-m mac --mac-source $src_mac} \
- -j ${target:-DNAT} $natopt $nataddr${natports:+:$natports}
-
- [ -n "$dest_ip" ] && \
- $IPTABLES -I ${fwdchain:-forward} 1 \
- $srcaddr $destaddr \
- ${proto:+-p $proto} \
- ${srcports:+--sport $srcports} \
- ${destports:+--dport $destports} \
- ${src_mac:+-m mac --mac-source $src_mac} \
- -j ACCEPT
- }
-
- [ "$proto" == "tcpudp" ] && proto="tcp udp"
- for proto in ${proto:-tcp udp}; do
- add_rule
- done
-}
-
-fw_include() {
- local path
- config_get path $1 path
- [ -e $path ] && . $path
-}
-
-get_interface_zones() {
- local interface="$2"
- local name
- local network
- local masq_src
- local masq_dest
- config_get name $1 name
- config_get network $1 network
- config_get masq_src $1 masq_src
- config_get masq_dest $1 masq_dest
- [ -z "$network" ] && network=$name
- for n in $network; do
- [ "$n" = "$interface" ] && {
- append add_zone "$name"
- append add_masq_src "$masq_src"
- append add_masq_dest "$masq_dest"
- }
- done
-}
-
-fw_event() {
- local action="$1"
- local interface="$2"
- local ifname="$(sh -c ". /etc/functions.sh; include /lib/network; scan_interfaces; config_get "$interface" ifname")"
- local add_zone=
- local add_masq_src=
- local add_masq_dest=
- local up
-
- [ -z "$ifname" ] && return 0
- config_foreach get_interface_zones zone "$interface"
- [ -z "$add_zone" ] && return 0
-
- case "$action" in
- ifup)
- for z in $add_zone; do
- local loaded masq_src masq_dest
- config_get loaded core loaded
- [ -n "$loaded" ] && addif "$interface" "$ifname" "$z" "$add_masq_src" "$add_masq_dest"
- done
- ;;
- ifdown)
- config_get up "$interface" up
-
- for z in $ZONE; do
- local masq_src masq_dest
- config_get masq_src core "${z}_masq_src"
- config_get masq_dest core "${z}_masq_dest"
- [ "$up" == "1" ] && delif "$interface" "$ifname" "$z" "$masq_src" "$masq_dest"
- done
- ;;
- esac
-}
-
-fw_addif() {
- local up
- local ifname
- config_get up $1 up
- [ -n "$up" ] || return 0
- fw_event ifup "$1"
-}
-
-fw_custom_chains() {
- [ -n "$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 -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
-}
-
-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_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=
-
- echo "Loading defaults"
- config_foreach fw_defaults defaults
- echo "Loading zones"
- config_foreach fw_zone zone
- 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
- echo "Loading zone defaults"
- config_foreach fw_zone_defaults zone
- uci_set_state firewall core loaded 1
- config_set core loaded 1
- config_foreach fw_check_notrack zone
- INTERFACES="$(sh -c '
- . /etc/functions.sh; config_load network
- echo_up() { local up; config_get_bool up "$1" up 0; [ $up = 1 ] && echo "$1"; }
- config_foreach echo_up interface
- ')"
- for interface in $INTERFACES; do
- fw_event ifup "$interface"
- done
-
- uci_set_state firewall core zones "$ZONE_NAMES"
-}
-
-fw_stop() {
- local z n i
- config_get z core zones
- for z in $z; do
- config_get n core "${z}_networks"
- for n in $n; do
- config_get i core "${n}_ifname"
- [ -n "$i" ] && env -i ACTION=remove ZONE="$z" INTERFACE="$n" DEVICE="$i" \
- /sbin/hotplug-call firewall
- done
- done
-
- fw_clear
- $IPTABLES -P INPUT ACCEPT
- $IPTABLES -P OUTPUT ACCEPT
- $IPTABLES -P FORWARD ACCEPT
- uci_revert_state firewall
-}
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