Script showing how to setup Ethernet bridging using ng_bridge(4).

share/examples/netgraph/ether.bridge

@@ -0,0 +1,167 @@
+#!/bin/sh
+# $FreeBSD$
+
+# This script sets up an Ethernet bridging network across multiple
+# Ethernet interfaces using the ng_bridge(4) and ng_ether(4) netgraph
+# node types.
+#
+# To use this script:
+#
+# 0. Make your own copy of this example script
+#
+# 1. Give your bridging network a name by editing the definition of
+#    ${BRIDGE_NAME} below. It must be a valid netgraph node name.
+#
+# 2. Edit the definitions of ${BRIDGE_IFACES} and ${LOCAL_IFACE}
+#    as described below to define your bridging interfaces.
+#
+# 3. Run this script with "start" as the command line argument.
+#
+# 4. Examine bridging statistics by running this script with "stats"
+#    as the command line argument.
+#
+# 5. Stop bridging by running this script with "stop" as the
+#    command line argument.
+#
+# To run multiple independent bridging networks, create multiple
+# copies of this script with different variable definitions.
+# 
+
+# Give each bridging network a unique name here
+
+BRIDGE_NAME="bnet0"
+
+# List the names of the interfaces that you want to bridge across
+# here in ${BRIDGE_IFACES}. If you want to include the local host
+# machine as well then set ${LOCAL_IFACE} as well (it may also be
+# listed in ${BRIDGE_IFACES}). Of course, any ${LOCAL_IFACE} must
+# be ifconfig(8)ured separately. If you don't want a ${LOCAL_IFACE}
+# then leave it defined as the emtpy string.
+
+BRIDGE_IFACES="ed0 fxp0 fxp1"
+LOCAL_IFACE="fxp0"
+
+####################################################################
+#### Everything below this point should not need to be modified ####
+####################################################################
+
+# Routine to verify node's existence
+bridge_verify() {
+	ngctl info ${BRIDGE_NAME}: >/dev/null 2>&1
+	if [ $? -ne 0 ]; then
+		echo "${BRIDGE_NAME}: bridge network not found"
+		exit 1
+	fi
+}
+
+# Routine to get and display link stats
+bridge_linkstats() {
+	STATS=`ngctl msg ${BRIDGE_NAME}: getstats $1`
+	if [ $? -ne 0 ]; then
+		exit 1
+	fi
+	echo "${STATS}" | fmt 2 | awk '/=/ { fl=index($0, "="); \
+	    printf "%20s = %s\n", substr($0, 0, fl - 1), substr($0, fl + 1); }'
+}
+
+# Start/restart routine
+bridge_start() {
+
+	# Load netgraph KLD's as necessary
+	for KLD in ng_ether ng_bridge; do
+		if kldstat -v | grep -qw ${KLD}; then
+		else
+			echo -n "Loading ${KLD}.ko... "
+			kldload ${KLD} || exit 1
+			echo "done"
+		fi
+	done
+
+	# Reset all interfaces
+	bridge_stop
+
+	# Verify all interfaces exist
+	for ETHER in ${BRIDGE_IFACES} ${LOCAL_IFACE}; do
+		if ngctl info ${ETHER}: >/dev/null 2>&1; then
+		else
+			echo "Error: interface ${ETHER} does not exist"
+			exit 1
+		fi
+		ifconfig ${ETHER} up || exit 1
+	done
+
+	# Create new ng_bridge(4) node, attached to the first interface
+	FIRSTIF=`echo ${BRIDGE_IFACES} | awk '{ print $1 }'`
+	ngctl mkpeer ${FIRSTIF}: bridge lower link0 || exit 1
+	ngctl name ${FIRSTIF}:lower ${BRIDGE_NAME} || exit 1
+
+	# Attach other interfaces as well
+	LINKNUM=0
+	for ETHER in ${BRIDGE_IFACES}; do
+		if [ ${LINKNUM} != 0 ]; then
+			ngctl connect ${ETHER}: ${BRIDGE_NAME}: \
+			    lower link${LINKNUM} || exit 1
+		fi
+		LINKNUM=`expr ${LINKNUM} + 1`
+	done
+
+	# Hook up local interface, if any
+	if [ "${LOCAL_IFACE}" != "" ]; then
+		ngctl connect ${LOCAL_IFACE}: ${BRIDGE_NAME}: \
+		    upper link${LINKNUM} || exit 1
+	fi
+
+	# Set all interfaces in promiscuous mode and don't overwrite src addr
+	for ETHER in ${BRIDGE_IFACES}; do
+		ngctl msg ${ETHER}: setpromisc 1 || exit 1
+		ngctl msg ${ETHER}: setautosrc 0 || exit 1
+	done
+}
+
+# Stop routine
+bridge_stop() {
+	ngctl kill ${BRIDGE_NAME}: >/dev/null 2>&1
+	for ETHER in ${BRIDGE_IFACES} ${LOCAL_IFACE}; do
+		ngctl kill ${ETHER}: >/dev/null 2>&1
+	done
+}
+
+# Stats routine
+bridge_stats() {
+
+	# Make sure node exists
+	bridge_verify
+
+	echo ""
+	echo "Statistics for bridging network ${BRIDGE_NAME}:"
+	echo ""
+	LINKNUM=0
+	for ETHER in ${BRIDGE_IFACES}; do
+		echo "Network interface ${ETHER}:"
+		bridge_linkstats ${LINKNUM}
+		LINKNUM=`expr ${LINKNUM} + 1`
+	done
+	if [ "${LOCAL_IFACE}" != "" ]; then
+		echo "Local host interface ${ETHER}:"
+		bridge_linkstats ${LINKNUM}
+	fi
+}
+
+# Main entry point
+case $1 in
+	start)
+		bridge_start
+		;;
+	stats)
+		bridge_verify
+		bridge_stats
+		;;
+	stop)
+		bridge_verify
+		bridge_stop
+		;;
+	*)
+		echo "Usage: ether.bridge [ start | stop | stats ]"
+		exit 1
+esac
+