doc/sample.qemu-ifup

#!/bin/sh
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# by Richard Gass and Michael Stroucken

# Adapt the following two parameters to your installation
# Uplink interface
UPLINKIF="eth0"  
# Prefix for bridge naming
BRIDGEPREFIX="br"

vlanID=$(echo $0 | awk -F "ifup." '{print $2}')
vmIf=$1

#  see if tagged interface exists
bridgeUplinkIf="${UPLINKIF}.${vlanID}"
cat /proc/net/vlan/config | grep "${bridgeUplinkIf} "
if [ $? -gt 0 ];then
        echo "creating tagged interface"
        vconfig add ${UPLINKIF} ${vlanID}
        ip link set ${bridgeUplinkIf} up
fi
 
#  Check for the bridge
bridgeName="${BRIDGEPREFIX}${vlanID}"
brctl show | grep "^${bridgeName}"  
if [ $? -gt 0 ];then
        echo "creating bridge interface"
        brctl addbr ${bridgeName}
        brctl addif ${bridgeName} ${bridgeUplinkIf}
        ip link set ${bridgeName} up
fi
 
/sbin/ifconfig ${vmIf} 0.0.0.0 up
/usr/sbin/brctl addif ${bridgeName} ${vmIf}
exit 0