#!/bin/bash
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#!/bin/bash
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# Copyright (C) 2010 ORSoC AB
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# Copyright (C) 2010 ORSoC AB
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# Copyright (C) 2010 Embecosm Limited
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# Copyright (C) 2010 Embecosm Limited
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# Contributor Julius Baxter <julius.baxter@orsoc.se>
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# Contributor Julius Baxter <julius.baxter@orsoc.se>
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# Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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# Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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# This file is a superuser script to set up an Ethernet bridge that can be
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# This file is a superuser script to set up an Ethernet bridge that can be
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# used with Or1ksim via the TUN/TAP interface.
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# used with Or1ksim via the TUN/TAP interface.
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# This program is free software; you can redistribute it and/or modify it
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the Free
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# under the terms of the GNU General Public License as published by the Free
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# Software Foundation; either version 3 of the License, or (at your option)
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# Software Foundation; either version 3 of the License, or (at your option)
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# any later version.
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# any later version.
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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# more details.
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# more details.
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# You should have received a copy of the GNU General Public License along
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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# ------------------------------------------------------------------------------
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# ------------------------------------------------------------------------------
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# Pre-requisites: bridge-utils must be installed.
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# Pre-requisites: bridge-utils must be installed.
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# Usage: ./brset.sh <bridge> <eth> <tap> [<tap> <tap> ...]
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# Usage: ./brstart.sh <username> <groupname> <bridge> <eth> <tap>
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# - <bridge> is the bridge interface to use, e.g. br0
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# - <bridge> is the bridge interface to use, e.g. br0
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# - <eth> is the hardware ethernet interface to use, e.g. eth0
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# - <eth> is the hardware ethernet interface to use, e.g. eth0
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# - <tap> is/are the persistent TAP interface(s)
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# - <tap> is/are the persistent TAP interface(s)
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# The tap interfaces must have been previously set up persistently by the
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# Check we have the right number of arguments
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# superuser using for example:
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if [ "x$#" != "x5" ]
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then
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# openvpn --mktun --dev tap<n> --user <username> --group <groupname>
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echo "Usage: ./brstart.sh <username> <groupname> <bridge> <eth> <tap>"
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exit 1
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# Define Bridge Interface
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fi
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br=$1
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shift
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# Check we are root
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euid=`id -un`
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# Host ethernet interface to use
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if [ "x${euid}" != "xroot" ]
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eth=$1
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then
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shift
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echo "Must run as root"
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exit 1
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# Determine the IP address, netmask and broadcast of the host.
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fi
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# Break out the arguments
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username=$1
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groupname=$2
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br=$3
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eth=$4
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tap=$5
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# Determine the IP address, netmask and broadcast of the current Ethernet
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# interface. This is used if the bridge is set up manually, rather than using
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# DHCP.
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eth_ip=`ifconfig $eth | \
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eth_ip=`ifconfig $eth | \
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grep "inet addr" | \
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grep "inet addr" | \
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head -1 | \
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head -1 | \
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sed -e 's/^.*inet addr:\([^ \t]*\).*$/\1/'`
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sed -e 's/^.*inet addr:\([^ \t]*\).*$/\1/'`
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eth_netmask=`ifconfig $eth | \
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eth_netmask=`ifconfig $eth | \
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grep "Mask" | \
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grep "Mask" | \
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head -1 | \
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head -1 | \
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sed -e 's/^.*Mask:\([^ \t]*\).*$/\1/'`
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sed -e 's/^.*Mask:\([^ \t]*\).*$/\1/'`
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eth_broadcast=`ifconfig $eth | \
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eth_broadcast=`ifconfig $eth | \
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grep "Bcast" | \
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grep "Bcast" | \
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head -1 | \
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head -1 | \
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sed -e 's/^.*Bcast:\([^ \t]*\).*$/\1/'`
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sed -e 's/^.*Bcast:\([^ \t]*\).*$/\1/'`
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# Define list of TAP interfaces to be bridged,
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# Create the TAP interface
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tap=$*
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openvpn --mktun --dev ${tap} --user ${username} --group ${groupname}
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echo "Creating bridge $br"
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if [ $? != 0 ]
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echo " Host Ethernet device: $eth"
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then
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echo " Host IP address: $eth_ip"
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echo "Failed to create ${tap}"
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echo " Host netmask: $eth_netmask"
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exit 1
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echo " Host broadcast: $eth_broadcast"
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fi
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echo " Target TAP device(s): $tap"
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# Create the bridge
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# Create the bridge
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brctl addbr $br
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brctl addbr ${br}
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# Add the host Ethernet and TAP interfaces
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brctl addif $br $eth
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for t in $tap; do
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brctl addif $br $t
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done
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# Remove the IP addresses of the underlying interfaces
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ifconfig $eth 0.0.0.0 promisc up
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for t in $tap; do
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if [ $? != 0 ]
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ifconfig $t 0.0.0.0 promisc up
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then
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echo "Failed to create ${br}"
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exit 1
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fi
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# Add the host Ethernet and TAP interfaces, removing the IP addresses of the
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# underlying interfaces.
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for i in ${eth} ${tap}
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do
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# Add the interface
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brctl addif ${br} ${i}
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if [ $? != 0 ]
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then
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echo "Failed to create ${i}"
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exit 1
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fi
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# Remove the IP address
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ifconfig ${i} 0.0.0.0 promisc up
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if [ $? != 0 ]
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then
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echo "Failed to remove IP interface of ${i}"
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exit 1
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fi
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done
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done
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# Reconfigure the bridge to have the Ethernet address that had been used just
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# Reconfigure the bridge to have the appropriate Ethernet address. This uses
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# by $eth.
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# dhclient to get the information from DHCP, but we could instead use
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# ifconfig $br $eth_ip netmask $eth_netmask broadcast $eth_broadcast
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# ifconfig and the data about the original IP address, netmask and broadcast
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dhclient $br
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# mask as follows:
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# ifconfig ${br} ${eth_ip} netmask ${eth_netmask} broadcast ${eth_broadcast}
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dhclient ${br}
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# Open up firewall to the tap and bridge. We have a generic reject at the end
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# of the chain, so we insert these at the start.
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iptables -I INPUT 1 -i ${tap} -j ACCEPT
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iptables -I INPUT 1 -i ${br} -j ACCEPT
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iptables -I FORWARD 1 -i ${br} -j ACCEPT
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No newline at end of file
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No newline at end of file
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