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firewall: - handle NAT reflection in firewall hotplug, solves synchronizing issues on boot - introduce masq_src and masq_dest options to limit zone masq to specific ip ranges, supports multiple subnets and negation

Browse Source 
SVN-Revision: 22888
v19.07.3_mercusys_ac12_duma
Jo-Philipp Wich 14 years ago
parent 3e747a7f75
commit ca5bf9e291
4 changed files with 33 additions and 8 deletions
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5
package/firewall/Makefile
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@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=firewall
PKG_VERSION:=2
PKG_RELEASE:=10
PKG_RELEASE:=11
include $(INCLUDE_DIR)/package.mk
@ -45,7 +45,8 @@ define Package/firewall/install
$(INSTALL_BIN) ./files/firewall.init $(1)/etc/init.d/firewall
$(INSTALL_DIR) $(1)/etc/hotplug.d/iface
$(INSTALL_DATA) ./files/firewall.hotplug $(1)/etc/hotplug.d/iface/20-firewall
$(INSTALL_DATA) ./files/reflection.hotplug $(1)/etc/hotplug.d/iface/30-nat-reflection
$(INSTALL_DIR) $(1)/etc/hotplug.d/firewall
$(INSTALL_DATA) ./files/reflection.hotplug $(1)/etc/hotplug.d/firewall/10-nat-reflection
$(INSTALL_DIR) $(1)/etc
$(INSTALL_DATA) ./files/firewall.user $(1)/etc
endef

2
package/firewall/files/lib/core_init.sh
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@ -142,6 +142,8 @@ fw_config_get_zone() {
string output "$FW_DEFAULT_OUTPUT_POLICY" \
string forward "$FW_DEFAULT_FORWARD_POLICY" \
boolean masq 0 \
string masq_src "" \
string masq_dest "" \
boolean conntrack 0 \
boolean mtu_fix 0 \
boolean custom_chains "$FW_ADD_CUSTOM_CHAINS" \

32
package/firewall/files/lib/core_interface.sh
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@ -12,8 +12,9 @@ fw_configure_interface() {
}
[ -n "$ifname" ] || {
ifname=$(uci_get_state network "$iface" ifname "$iface")
ifname=$(uci_get_state network "$iface" ifname)
ifname="${ifname%%:*}"
[ -z "$ifname" ] && return 0
}
[ "$ifname" == "lo" ] && return 0
@ -26,6 +27,8 @@ fw_configure_interface() {
local chain=zone_${zone}
local ifname=$3
local subnet=$4
local masq_src=$5
local masq_dest=$6
local inet onet
local mode=$(fw_get_family_mode x $zone i)
@ -59,7 +62,16 @@ fw_configure_interface() {
fw $action $mode f ${chain}_REJECT reject $ { -o "$ifname" $onet }
fw $action $mode f ${chain}_REJECT reject $ { -i "$ifname" $inet }
fw $action $mode n ${chain}_nat MASQUERADE $ { -o "$ifname" $onet }
# NB: if MASQUERADING for IPv6 becomes available we'll need a family check here
local msrc mdst
for msrc in ${masq_src:-0.0.0.0/0}; do
[ "${msrc#!}" != "$msrc" ] && msrc="! -s ${msrc#!}" || msrc="-s $msrc"
for mdst in ${subnet:-${masq_dest:-0.0.0.0/0}}; do
[ "${mdst#!}" != "$mdst" ] && mdst="! -d ${mdst#!}" || mdst="-d $mdst"
fw $action $mode n ${chain}_nat MASQUERADE $ { -o "$ifname" $msrc $mdst }
done
done
fw $action $mode f ${chain}_MSSFIX TCPMSS $ { -o "$ifname" -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu $onet }
fw $action $mode f input ${chain} $ { -i "$ifname" $inet }
@ -68,18 +80,20 @@ fw_configure_interface() {
fw $action $mode r PREROUTING ${chain}_notrack $ { -i "$ifname" $inet }
}
local old_zones old_ifname old_subnets
local old_zones old_ifname old_subnets old_masq_src old_masq_dest
config_get old_zones core "${iface}_zone"
[ -n "$old_zones" ] && {
config_get old_ifname core "${iface}_ifname"
config_get old_subnets core "${iface}_subnets"
config_get old_masq_src core "${iface}_masq_src"
config_get old_masq_dest core "${iface}_masq_dest"
local z
for z in $old_zones; do
local n
for n in ${old_subnets:-""}; do
fw_log info "removing $iface ($old_ifname${n:+ alias $n}) from zone $z"
fw__do_rules del $z $old_ifname $n
fw__do_rules del $z $old_ifname $n "$old_masq_src" "$old_masq_dest"
done
[ -n "$old_subnets" ] || ACTION=remove ZONE="$z" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
@ -97,6 +111,8 @@ fw_configure_interface() {
uci_revert_state firewall core "${iface}_ifname"
uci_revert_state firewall core "${iface}_subnets"
uci_revert_state firewall core "${iface}_aliases"
uci_revert_state firewall core "${iface}_masq_src"
uci_revert_state firewall core "${iface}_masq_dest"
}
[ "$action" == del ] && return
@ -130,13 +146,17 @@ fw_configure_interface() {
}
local new_zones=
local new_masq_src=
local new_masq_dest=
load_zone() {
fw_config_get_zone "$1"
list_contains zone_network "$iface" || return
fw_log info "adding $iface ($ifname${aliasnet:+ alias $aliasnet}) to zone $zone_name"
fw__do_rules add ${zone_name} "$ifname" $aliasnet
fw__do_rules add ${zone_name} "$ifname" "$aliasnet" "$zone_masq_src" "$zone_masq_dest"
append new_zones $zone_name
append new_masq_src "$zone_masq_src"
append new_masq_dest "$zone_masq_dest"
[ -n "$aliasnet" ] || ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
}
@ -144,6 +164,8 @@ fw_configure_interface() {
uci_set_state firewall core "${iface}_zone" "$new_zones"
uci_set_state firewall core "${iface}_ifname" "$ifname"
uci_set_state firewall core "${iface}_masq_src" "$new_masq_src"
uci_set_state firewall core "${iface}_masq_dest" "$new_masq_dest"
}
fw_sysctl_interface() {

2
package/firewall/files/reflection.hotplug
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@ -2,7 +2,7 @@
. /etc/functions.sh
if [ "$ACTION" = "ifup" ] && [ "$INTERFACE" = "wan" ]; then
if [ "$ACTION" = "add" ] && [ "$INTERFACE" = "wan" ]; then
local wanip=$(uci -P/var/state get network.wan.ipaddr)
iptables -t nat -F nat_reflection_in 2>/dev/null || {

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