171 lines
4.5 KiB
Bash
171 lines
4.5 KiB
Bash
#!/bin/sh
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# $FreeBSD$
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# This script sets up an Ethernet bridging network across multiple
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# Ethernet interfaces using the ng_bridge(4) and ng_ether(4) netgraph
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# node types.
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#
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# To use this script:
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#
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# 0. Make your own copy of this example script.
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#
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# 1. Give your bridging network a name by editing the definition of
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# ${BRIDGE_NAME} below. It must be a valid netgraph node name.
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#
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# 2. Edit the definitions of ${BRIDGE_IFACES} and ${LOCAL_IFACES}
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# as described below to define your bridging interfaces.
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#
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# 3. Run this script with "start" as the command line argument.
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#
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# 4. Examine bridging statistics by running this script with "stats"
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# as the command line argument.
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#
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# 5. Stop bridging by running this script with "stop" as the
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# command line argument.
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#
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# To run multiple independent bridging networks, create multiple
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# copies of this script with different variable definitions.
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#
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# To make a "brouted" network, with IP being routed and other protocols being
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# bridged, add all the interface in the BRIDGE_IFACES to the LOCAL_IFACES.
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# If you just want a normal bridge, just one will be enough.
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# In some cases you may want some combination.
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#
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# Give each bridging network a unique name here.
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BRIDGE_NAME="bnet0"
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# List the names of the interfaces that you want to bridge across
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# here in ${BRIDGE_IFACES}. If you want to include the local host
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# machine as well then set ${LOCAL_IFACES} as well (they may also be
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# listed in ${BRIDGE_IFACES}). Of course, any ${LOCAL_IFACE} must
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# be ifconfig(8)ured separately. If you don't want a ${LOCAL_IFACE}
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# then assign it the empty string.
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BRIDGE_IFACES="de0 fxp0 fxp1"
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LOCAL_IFACES="fxp0 fxp1"
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#####################################################################
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#### Everything below this point should not need to be modified. ####
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#####################################################################
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# Routine to verify node's existence.
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bridge_verify() {
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ngctl info ${BRIDGE_NAME}: >/dev/null 2>&1
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if [ $? -ne 0 ]; then
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echo "${BRIDGE_NAME}: bridge network not found"
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exit 1
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fi
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}
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# Routine to get and display link stats.
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bridge_linkstats() {
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STATS=`ngctl msg ${BRIDGE_NAME}: getstats $1`
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if [ $? -ne 0 ]; then
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exit 1
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fi
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echo "${STATS}" | fmt 2 | awk '/=/ { fl=index($0, "="); \
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printf "%20s = %s\n", substr($0, 0, fl - 1), substr($0, fl + 1); }'
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}
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# Start/restart routine.
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bridge_start() {
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# Load netgraph KLD's as necessary.
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for KLD in ng_ether ng_bridge; do
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if ! kldstat -v | grep -qw ${KLD}; then
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echo -n "Loading ${KLD}.ko... "
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kldload ${KLD} || exit 1
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echo "done"
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fi
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done
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# Reset all interfaces.
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bridge_stop
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# Verify all interfaces exist.
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for ETHER in ${BRIDGE_IFACES} ${LOCAL_IFACES}; do
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if ! ngctl info ${ETHER}: >/dev/null 2>&1; then
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echo "Error: interface ${ETHER} does not exist"
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exit 1
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fi
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ifconfig ${ETHER} up || exit 1
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done
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# Create new ng_bridge(4) node, attached to the first interface.
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FIRSTIF=`echo ${BRIDGE_IFACES} | awk '{ print $1 }'`
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ngctl mkpeer ${FIRSTIF}: bridge lower link0 || exit 1
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ngctl name ${FIRSTIF}:lower ${BRIDGE_NAME} || exit 1
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# Attach other interfaces as well.
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LINKNUM=0
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for ETHER in ${BRIDGE_IFACES}; do
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if [ ${LINKNUM} != 0 ]; then
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ngctl connect ${ETHER}: ${BRIDGE_NAME}: \
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lower link${LINKNUM} || exit 1
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fi
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LINKNUM=`expr ${LINKNUM} + 1`
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done
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# Hook up local interface, if any.
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for LOCAL_IFACE in ${LOCAL_IFACES}; do
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ngctl connect ${LOCAL_IFACE}: ${BRIDGE_NAME}: \
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upper link${LINKNUM} || exit 1
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LINKNUM=`expr ${LINKNUM} + 1`
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done
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# Set all interfaces in promiscuous mode and don't overwrite src addr.
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for ETHER in ${BRIDGE_IFACES}; do
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ngctl msg ${ETHER}: setpromisc 1 || exit 1
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ngctl msg ${ETHER}: setautosrc 0 || exit 1
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done
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}
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# Stop routine.
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bridge_stop() {
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ngctl kill ${BRIDGE_NAME}: >/dev/null 2>&1
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for ETHER in ${BRIDGE_IFACES} ${LOCAL_IFACES}; do
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ngctl kill ${ETHER}: >/dev/null 2>&1
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done
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}
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# Stats routine.
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bridge_stats() {
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# Make sure node exists.
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bridge_verify
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echo ""
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echo "Statistics for bridging network ${BRIDGE_NAME}:"
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echo ""
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LINKNUM=0
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for ETHER in ${BRIDGE_IFACES}; do
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echo "Network interface ${ETHER}:"
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bridge_linkstats ${LINKNUM}
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LINKNUM=`expr ${LINKNUM} + 1`
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done
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for LOCAL_IFACE in ${LOCAL_IFACES}; do
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echo "Local host interface ${LOCAL_IFACE}:"
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bridge_linkstats ${LINKNUM}
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LINKNUM=`expr ${LINKNUM} + 1`
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done
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}
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# Main entry point.
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case $1 in
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start)
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bridge_start
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;;
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stats)
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bridge_verify
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bridge_stats
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;;
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stop)
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bridge_verify
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bridge_stop
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;;
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*)
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echo "usage: $0 [ start | stop | stats ]"
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exit 1
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esac
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