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[/] [openrisc/] [trunk/] [or1ksim/] [brstart.sh] - Rev 844
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#!/bin/bash # Copyright (C) 2010 ORSoC AB # Copyright (C) 2010 Embecosm Limited # Contributor Julius Baxter <julius.baxter@orsoc.se> # Contributor Jeremy Bennett <jeremy.bennett@embecosm.com> # This file is a superuser script to set up an Ethernet bridge that can be # used with Or1ksim via the TUN/TAP interface. # This program is free software; you can redistribute it and/or modify it # under the terms of the GNU General Public License as published by the Free # Software Foundation; either version 3 of the License, or (at your option) # any later version. # This program is distributed in the hope that it will be useful, but WITHOUT # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for # more details. # You should have received a copy of the GNU General Public License along # with this program. If not, see <http://www.gnu.org/licenses/>. # ------------------------------------------------------------------------------ # Pre-requisites: bridge-utils must be installed. # Usage: ./brstart.sh <username> <groupname> <bridge> <eth> <tap> # - <bridge> is the bridge interface to use, e.g. br0 # - <eth> is the hardware ethernet interface to use, e.g. eth0 # - <tap> is/are the persistent TAP interface(s) # Check we have the right number of arguments if [ "x$#" != "x5" ] then echo "Usage: ./brstart.sh <username> <groupname> <bridge> <eth> <tap>" exit 1 fi # Check we are root euid=`id -un` if [ "x${euid}" != "xroot" ] then echo "Must run as root" exit 1 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 | \ grep "inet addr" | \ head -1 | \ sed -e 's/^.*inet addr:\([^ \t]*\).*$/\1/'` eth_netmask=`ifconfig $eth | \ grep "Mask" | \ head -1 | \ sed -e 's/^.*Mask:\([^ \t]*\).*$/\1/'` eth_broadcast=`ifconfig $eth | \ grep "Bcast" | \ head -1 | \ sed -e 's/^.*Bcast:\([^ \t]*\).*$/\1/'` # Create the TAP interface openvpn --mktun --dev ${tap} --user ${username} --group ${groupname} if [ $? != 0 ] then echo "Failed to create ${tap}" exit 1 fi # Create the bridge brctl addbr ${br} if [ $? != 0 ] 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 # Reconfigure the bridge to have the appropriate Ethernet address. This uses # dhclient to get the information from DHCP, but we could instead use # ifconfig and the data about the original IP address, netmask and broadcast # 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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