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[/] [openrisc/] [trunk/] [or1ksim/] [brstart.sh] - Diff between revs 443 and 461

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# ------------------------------------------------------------------------------
# ------------------------------------------------------------------------------
 
 
# Pre-requisites: bridge-utils must be installed.
# Pre-requisites: bridge-utils must be installed.
 
 
# Usage: ./brset.sh <bridge> <eth> <tap> [<tap> <tap> ...]
# Usage: ./brstart.sh <username> <groupname> <bridge> <eth> <tap>
 
 
# - <bridge> is the bridge interface to use, e.g. br0
# - <bridge> is the bridge interface to use, e.g. br0
# - <eth> is the hardware ethernet interface to use, e.g. eth0
# - <eth> is the hardware ethernet interface to use, e.g. eth0
# - <tap> is/are the persistent TAP interface(s)
# - <tap> is/are the persistent TAP interface(s)
 
 
# The tap interfaces must have been previously set up persistently by the
# Check we have the right number of arguments
# superuser using for example:
if [ "x$#" != "x5" ]
 
then
# openvpn --mktun --dev tap<n> --user <username> --group <groupname>
    echo "Usage: ./brstart.sh <username> <groupname> <bridge> <eth> <tap>"
 
    exit 1
# Define Bridge Interface
fi
br=$1
 
shift
# Check we are root
 
euid=`id -un`
# Host ethernet interface to use
if [ "x${euid}" != "xroot" ]
eth=$1
then
shift
    echo "Must run as root"
 
    exit 1
# Determine the IP address, netmask and broadcast of the host.
fi
 
 
 
# Break out the arguments
 
username=$1
 
groupname=$2
 
br=$3
 
eth=$4
 
tap=$5
 
 
 
# Determine the IP address, netmask and broadcast of the current Ethernet
 
# interface. This is used if the bridge is set up manually, rather than using
 
# DHCP.
eth_ip=`ifconfig $eth | \
eth_ip=`ifconfig $eth | \
        grep "inet addr" | \
        grep "inet addr" | \
        head -1 | \
        head -1 | \
        sed -e 's/^.*inet addr:\([^ \t]*\).*$/\1/'`
        sed -e 's/^.*inet addr:\([^ \t]*\).*$/\1/'`
eth_netmask=`ifconfig $eth | \
eth_netmask=`ifconfig $eth | \
Line 57... Line 68...
eth_broadcast=`ifconfig $eth | \
eth_broadcast=`ifconfig $eth | \
        grep "Bcast" | \
        grep "Bcast" | \
        head -1 | \
        head -1 | \
        sed -e 's/^.*Bcast:\([^ \t]*\).*$/\1/'`
        sed -e 's/^.*Bcast:\([^ \t]*\).*$/\1/'`
 
 
# Define list of TAP interfaces to be bridged,
# Create the TAP interface
tap=$*
openvpn --mktun --dev ${tap} --user ${username} --group ${groupname}
 
 
echo "Creating bridge $br"
if [ $? != 0 ]
echo "  Host Ethernet device: $eth"
then
echo "  Host IP address:      $eth_ip"
    echo "Failed to create ${tap}"
echo "  Host netmask:         $eth_netmask"
    exit 1
echo "  Host broadcast:       $eth_broadcast"
fi
echo "  Target TAP device(s): $tap"
 
 
 
# Create the bridge
# Create the bridge
brctl addbr $br
brctl addbr ${br}
 
 
# Add the host Ethernet and TAP interfaces
 
brctl addif $br $eth
 
 
 
for t in $tap; do
 
    brctl addif $br $t
 
done
 
 
 
# Remove the IP addresses of the underlying interfaces
 
ifconfig $eth 0.0.0.0 promisc up
 
 
 
for t in $tap; do
if [ $? != 0 ]
    ifconfig $t 0.0.0.0 promisc up
then
 
    echo "Failed to create ${br}"
 
    exit 1
 
fi
 
 
 
# Add the host Ethernet and TAP interfaces, removing the IP addresses of the
 
# underlying interfaces.
 
for i in ${eth} ${tap}
 
do
 
    # Add the interface
 
    brctl addif ${br} ${i}
 
 
 
    if [ $? != 0 ]
 
    then
 
        echo "Failed to create ${i}"
 
        exit 1
 
    fi
 
 
 
    # Remove the IP address
 
    ifconfig ${i} 0.0.0.0 promisc up
 
 
 
    if [ $? != 0 ]
 
    then
 
        echo "Failed to remove IP interface of ${i}"
 
        exit 1
 
    fi
done
done
 
 
# Reconfigure the bridge to have the Ethernet address that had been used just
# Reconfigure the bridge to have the appropriate Ethernet address. This uses
# by $eth.
# dhclient to get the information from DHCP, but we could instead use
# ifconfig $br $eth_ip netmask $eth_netmask broadcast $eth_broadcast
# ifconfig and the data about the original IP address, netmask and broadcast
dhclient $br
# mask as follows:
 
#   ifconfig ${br} ${eth_ip} netmask ${eth_netmask} broadcast ${eth_broadcast}
 
dhclient ${br}
 
 
 
# Open up firewall to the tap and bridge. We have a generic reject at the end
 
# of the chain, so we insert these at the start.
 
iptables -I INPUT 1 -i ${tap} -j ACCEPT
 
iptables -I INPUT 1 -i ${br} -j ACCEPT
 
iptables -I FORWARD 1 -i ${br} -j ACCEPT
 
 
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