#!/bin/bash # # QEMU network interface configuration script. This utility needs to # be run as root, and will use the tunctl binary from a Poky sysroot. # Note: many Linux distros these days still use an older version of # tunctl which does not support the group permissions option, hence # the need to use Poky's version. # # If this script is being run standalone in order to set up a bank of tap # devices for later qemu use, then a group id must be the first argument. # The resulting tap device will be group-owned by this group, and qemu # users must be members of this group. # # If the kernel is too old to support TUNSETGROUP, then a user must be passed # in as the second argument, the tap device will be owned by that user, and # only that user will be able to use it. # # Copyright (c) 2006-2010 Intel Corp. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License version 2 as # published by the Free Software Foundation. # # 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, write to the Free Software Foundation, Inc., # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. usage() { echo "$0 {uid} " echo "Where uid is *only* included if this script complains when it's missing" } if [[ $# -lt 2 || $# -gt 3 ]]; then usage exit 1 fi USER="" GROUP="-g $1" if [ $# -eq 2 ]; then NATIVE_SYSROOT_DIR=$2 else USER=$2 NATIVE_SYSROOT_DIR=$3 fi TUNCTL=$NATIVE_SYSROOT_DIR/usr/bin/tunctl if [ ! -e "$TUNCTL" ]; then echo "Error: Unable to find tunctl binary in '$NATIVE_SYSROOT_DIR/usr/bin'" if [[ "$NATIVE_SYSROOT_DIR" =~ ^\/opt\/poky ]]; then echo "This shouldn't happen - something is wrong with your toolchain installation" else echo "Have you run 'bitbake qemu-helper-native'?" fi exit 1 fi TAP=`$TUNCTL -b $GROUP 2>&1` STATUS=$? if [[ "$TAP" =~ "TUNSETGROUP" ]]; then # TUNSETGROUP failed because of permissions or the kernel being too old # Retry, falling back to a specific user if [ "$USER" = "" ]; then echo "TUNSETGROUP failed - add a username to the command line in order" echo "to have the tap device owned by that user" exit 1 fi TAP=`$TUNCTL -b -u $USER 2>&1` STATUS=$? # Force this to appear on stderr in order that the user sees it if this # is running from poky-qemu-internal and in order to avoid having this # output confuse it. echo "Only user $USER will be able to use $TAP - upgrade the kernel to " 1>&2 echo "2.6.23 or later in order to allow group access to tap devices" 1>&2 fi if [ $STATUS -ne 0 ]; then echo "tunctl failed:" echo $TAP exit 1 fi IFCONFIG=`which ifconfig` if [ "x$IFCONFIG" = "x" ]; then # better than nothing... IFCONFIG=/sbin/ifconfig fi ROUTE=`which route` if [ "x$ROUTE" = "x" ]; then # better than nothing... ROUTE=/sbin/route fi n=$[ (`echo $TAP | sed 's/tap//'` * 2) + 1 ] $IFCONFIG $TAP 192.168.7.$n dest=$[ (`echo $TAP | sed 's/tap//'` * 2) + 2 ] $ROUTE add -host 192.168.7.$dest $TAP # setup NAT for tap0 interface to have internet access in QEMU IPTABLES=`which iptables` if [ "x$IPTABLES" = "x" ]; then IPTABLES=/sbin/iptables fi $IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.0/24 echo 1 > /proc/sys/net/ipv4/ip_forward $IPTABLES -P FORWARD ACCEPT echo $TAP