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-rw-r--r--modules/freifunk/root/etc/firewall.freifunk51
-rw-r--r--modules/freifunk/root/etc/hotplug.d/iface/22-firewall-nat-fix61
2 files changed, 112 insertions, 0 deletions
diff --git a/modules/freifunk/root/etc/firewall.freifunk b/modules/freifunk/root/etc/firewall.freifunk
new file mode 100644
index 0000000000..ac3fcc55df
--- /dev/null
+++ b/modules/freifunk/root/etc/firewall.freifunk
@@ -0,0 +1,51 @@
+#!/bin/sh
+# Freifunk Firewall addons
+# $Id$
+
+
+#
+# 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_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
+
+ 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 )
+}
+
+config_foreach apply_nat_fix interface
diff --git a/modules/freifunk/root/etc/hotplug.d/iface/22-firewall-nat-fix b/modules/freifunk/root/etc/hotplug.d/iface/22-firewall-nat-fix
new file mode 100644
index 0000000000..634f432f08
--- /dev/null
+++ b/modules/freifunk/root/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
+}