contrib/package: add separate freifunk-firewall package

3 files changed, 175 insertions, 0 deletions

diff --git a/contrib/package/freifunk-firewall/Makefile b/contrib/package/freifunk-firewall/Makefile
new file mode 100644
index 000000000..d2ae07588
--- /dev/null
+++ b/contrib/package/freifunk-firewall/Makefile
@@ -0,0 +1,52 @@
+#
+# Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
+#
+# This is free software, licensed under the Apache 2.0 license.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=freifunk-firewall
+PKG_RELEASE:=1
+
+PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/freifunk-firewall
+  SECTION:=luci
+  CATEGORY:=LuCI
+  SUBMENU:=Freifunk
+  TITLE:=Freifunk Firewall Addon
+  DEPENDS:=+firewall
+endef
+
+define Package/freifunk-firewall/description
+  Various firewall extensions for Freifunk. Includes NAT fixes and advanced settings.
+endef
+
+define Build/Prepare
+	mkdir -p $(PKG_BUILD_DIR)
+endef
+
+define Build/Configure
+endef
+
+define Build/Compile
+endef
+
+define Package/freifunk-firewall/postinst
+#!/bin/sh
+
+if ! grep -q /etc/firewall.freifunk /etc/config/firewall; then
+  uci add firewall include >/dev/null
+  uci set firewall.@include[-1].path=/etc/firewall.freifunk
+  uci commit firewall
+fi
+endef
+
+define Package/freifunk-firewall/install
+	$(CP) ./files/* $(1)/
+endef
+
+$(eval $(call BuildPackage,freifunk-firewall))
diff --git a/contrib/package/freifunk-firewall/files/etc/firewall.freifunk b/contrib/package/freifunk-firewall/files/etc/firewall.freifunk
new file mode 100644
index 000000000..283c117d3
--- /dev/null
+++ b/contrib/package/freifunk-firewall/files/etc/firewall.freifunk
@@ -0,0 +1,62 @@
+#!/bin/sh
+# Freifunk Firewall addons
+# $Id: firewall.freifunk 4771 2009-06-07 11:57:52Z jow $
+
+
+#
+# Apply advanced settings
+#
+apply_advanced() {
+	local tcp_ecn
+	local tcp_window_scaling
+	local accept_redirects
+	local accept_source_route
+
+	config_get_bool tcp_ecn $1 tcp_ecn 1
+	config_get ip_conntrack_max $1 ip_conntrack_max
+	config_get_bool tcp_westwood $1 tcp_westwood 0
+	config_get_bool tcp_window_scaling $1 tcp_window_scaling 1
+	config_get_bool accept_redirects $1 accept_redirects 0
+	config_get_bool accept_source_route $1 accept_source_route 0
+
+	logger -t firewall.freifunk "tcp_ecn is $tcp_ecn"
+	logger -t firewall.freifunk "tcp_window_scaling is $tcp_window_scaling"
+	logger -t firewall.freifunk "accept_redirects is $accept_redirects"
+	logger -t firewall.freifunk "accept_source_route is $accept_source_route"
+
+	sysctl -w net.ipv4.tcp_ecn=$tcp_ecn >/dev/null
+	sysctl -w net.ipv4.tcp_window_scaling=$tcp_window_scaling >/dev/null
+	sysctl -w net.ipv4.tcp_westwood=$tcp_westwood >/dev/null
+	sysctl -w net.ipv4.ip_conntrack_max=$ip_conntrack_max >/dev/null
+
+	for f in /proc/sys/net/ipv4/conf/*/accept_redirects; do
+		echo $accept_redirects > $f
+	done
+
+	for f in /proc/sys/net/ipv4/conf/*/accept_source_route; do
+		echo $accept_source_route > $f
+	done
+}
+
+config_foreach apply_advanced advanced
+
+
+#
+# Apply fixes for masquerading rules
+#
+apply_nat_fix() {
+	local up
+	local ifname
+	config_get up $1 up
+	[ -n "$up" ] || return 0
+	(ACTION="ifup" INTERFACE="$1" . /etc/hotplug.d/iface/22-firewall-nat-fix )
+}
+
+uci_set_state firewall core loaded 1
+config_foreach fw_addif interface
+config_foreach apply_nat_fix interface
+
+[ -x /etc/init.d/luci_splash ] && ( sleep 3; /etc/init.d/luci_splash restart )&
+
+[ -x /etc/init.d/freifunk-p2pblock ] && /etc/init.d/freifunk-p2pblock enabled && \
+	( sleep 3; /etc/init.d/freifunk-p2pblock restart )&
diff --git a/contrib/package/freifunk-firewall/files/etc/hotplug.d/iface/22-firewall-nat-fix b/contrib/package/freifunk-firewall/files/etc/hotplug.d/iface/22-firewall-nat-fix
new file mode 100644
index 000000000..634f432f0
--- /dev/null
+++ b/contrib/package/freifunk-firewall/files/etc/hotplug.d/iface/22-firewall-nat-fix
@@ -0,0 +1,61 @@
+. /lib/firewall/uci_firewall.sh
+unset ZONE
+config_get ifname $INTERFACE ifname
+[ "$ifname" == "lo" ] && exit 0
+
+load_zones() {
+	local name
+	local network
+	config_get name $1 name
+	config_get network $1 network
+	[ -z "$network" ] && network=$name
+	for n in $network; do
+		[ "$n" = "$INTERFACE" ] && ZONE="$ZONE $name"
+	done
+}
+
+config_foreach load_zones zone
+
+[ -z "$ZONE" ] && exit 0
+
+natfix_addr_add() {
+	local network=$1
+	local iface=$2
+
+	config_get parent "$1" interface
+	[ "$network" != "$INTERFACE" -a "$parent" != "$INTERFACE" ] && return 0
+
+	config_get ipaddr "$network" ipaddr
+	[ -n "$ipaddr" ] || return 0
+	config_get netmask "$network" netmask
+	[ -n "$netmask" ] || return 0
+	eval "$(ipcalc.sh $ipaddr $netmask)"
+
+	logger -t firewall.freifunk "adding nat rule for $iface($NETWORK/$PREFIX)"
+	iptables -t nat -A "natfix_$iface" -s "$NETWORK/$PREFIX" -d "$NETWORK/$PREFIX" -j ACCEPT
+}
+
+[ ifup = "$ACTION" ] && {
+	iptables -t nat -N "natfix_$ifname"
+	natfix_addr_add "$INTERFACE" "$ifname"
+	config_foreach natfix_addr_add alias "$ifname"
+
+	for z in $ZONE; do
+		local loaded
+		config_get loaded core loaded
+		[ -n "$loaded" ] && {
+			logger -t firewall.freifunk "applying nat rules on zone $z"
+			iptables -t nat -I "zone_${z}_nat" 1 -o "$ifname" -j "natfix_$ifname"
+		}
+	done
+}
+
+[ ifdown = "$ACTION" ] && {
+	for z in $ZONE; do
+		local up
+		config_get up $z up
+		iptables -t nat -D "zone_${z}_nat" -o "$ifname" -j "natfix_$ifname" 2>/dev/null
+	done
+	iptables -t nat -F "natfix_$ifname" 2>/dev/null
+	iptables -t nat -X "natfix_$ifname" 2>/dev/null
+}