1 files changed, 127 insertions, 0 deletions
diff --git a/multitech/recipes/ocg-scripts/ocg-scripts-1.0/ocg-cell-router b/multitech/recipes/ocg-scripts/ocg-scripts-1.0/ocg-cell-router
new file mode 100755
index 0000000..c4c2d86
--- /dev/null
+++ b/multitech/recipes/ocg-scripts/ocg-scripts-1.0/ocg-cell-router
@@ -0,0 +1,127 @@
+#!/usr/bin/env bash
+
+set -e
+
+do_start() {
+	lan_interfaces=$(echo "$lan" | sed "s/,/ /g")
+
+	echo "Configuring firewall rules..."
+	# Flush all the tables first
+	iptables -t filter -F
+	iptables -t nat -F
+	iptables -t mangle -F
+
+	# Drop all incoming packets by default
+	iptables -t filter -P INPUT DROP
+	# Accept all on local loopback
+	iptables -t filter -A INPUT -i lo -j ACCEPT
+	# Allow packets in for existing socket connections
+	iptables -t filter -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
+
+	# Accept all from LAN interfaces
+	for i in $lan_interfaces; do
+		iptables -t filter -A INPUT -i $i -j ACCEPT
+
+		# Accept ssh from the LAN (Wired)
+		#iptables -t filter -A INPUT -i $i -p tcp --dport 22 -j ACCEPT
+		# Accept http from the LAN (Wired)
+		#iptables -t filter -A INPUT -i $i -p tcp --dport 80 -j ACCEPT
+		# Accept tftp from the LAN (Wired)
+		#iptables -t filter -A INPUT -i $i -p udp --dport 69 -j ACCEPT
+	done
+
+	# Accept ssh from the WAN (Wireless)
+	#iptables -t filter -A INPUT -i $wan -p tcp --dport 22 -j ACCEPT
+	# Accept http from the WAN (Wireless)
+	#iptables -t filter -A INPUT -i $wan -p tcp --dport 80 -j ACCEPT
+
+	# Allow packet fowarding from LAN interfaces to WAN (cell router)
+	iptables -t filter -P FORWARD DROP
+	iptables -t filter -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+	for i in $lan_interfaces; do
+		iptables -t filter -A FORWARD -i $i -o $wan -j ACCEPT
+	done
+
+	# Allow all output packets
+	iptables -t filter -P OUTPUT ACCEPT
+
+	# enable NAT for cell router
+	iptables -t nat -A POSTROUTING -o $wan -j MASQUERADE
+
+	echo "Enabling packet forwarding..."
+	# turn on packet forwarding last
+	echo 1 > /proc/sys/net/ipv4/ip_forward
+	echo "Done"
+}
+
+do_stop() {
+	echo "Clearing firewall rules..."
+	# clear all tables
+	iptables -t filter -F
+	iptables -t nat -F
+	iptables -t mangle -F
+	# reset policies to ACCEPT
+	iptables -t filter -P INPUT ACCEPT
+	iptables -t filter -P OUTPUT ACCEPT
+	iptables -t filter -P FORWARD ACCEPT
+
+	# turn off packet forwarding
+	echo "Disabling packet forwarding..."
+	echo 0 > /proc/sys/net/ipv4/ip_forward
+	echo "Done"
+}
+
+usage() {
+	echo "Usage: $(basename $0) start|stop [options]"
+	echo "  options:"
+	echo "    -l <lan-interfaces> LAN interfaces to allow, comma-separated (defaults to \"eth0\")"
+	echo "    -w <wan-interface>  WAN interface to route out (defaults to \"ppp0\")"
+	exit 1
+}
+
+# main
+if [[ $# < 1 ]]; then
+	usage
+fi
+
+cmd=$1
+shift
+
+while getopts "l:w:h" opt; do
+	case "$opt" in
+		l)
+			l=$OPTARG
+			;;
+		w)
+			w=$OPTARG
+			;;
+		h)
+			usage
+			;;
+		*)
+			usage
+			;;
+	esac
+done
+
+# default lan to eth0 if not specified
+lan=${l-eth0}
+# default wan to ppp0 if not specified
+wan=${w-ppp0}
+
+case $cmd in
+	start)
+		echo "LAN: $lan"
+		echo "WAN: $wan"
+		do_start
+		;;
+	stop)
+		do_stop
+		;;
+	*)
+		usage
+		;;
+esac
+
+exit 0
+