#!/bin/bash
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#
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# QEMU network interface configuration script. This utility needs to
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# be run as root, and will use the tunctl binary from a native sysroot.
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# Note: many Linux distros these days still use an older version of
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# tunctl which does not support the group permissions option, hence
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# the need to use build system's version.
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#
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# If you find yourself calling this script a lot, you can add the
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# the following to your /etc/sudoers file to be able to run this
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# command without entering your password each time:
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#
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# <my-username> ALL=NOPASSWD: /path/to/runqemu-ifup
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# <my-username> ALL=NOPASSWD: /path/to/runqemu-ifdown
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#
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# If you'd like to create a bank of tap devices at once, you should use
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# the runqemu-gen-tapdevs script instead. If tap devices are set up using
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# that script, the runqemu script will never end up calling this
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# script.
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#
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# Copyright (c) 2006-2011 Linux Foundation
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#
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# SPDX-License-Identifier: GPL-2.0-only
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#
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usage() {
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echo "sudo $(basename $0) <uid> <gid> <native-sysroot-basedir>"
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}
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if [ $EUID -ne 0 ]; then
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echo "Error: This script (runqemu-ifup) must be run with root privileges"
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exit 1
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fi
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if [ $# -ne 3 ]; then
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usage
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exit 1
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fi
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USERID="-u $1"
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GROUP="-g $2"
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STAGING_BINDIR_NATIVE=$3
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TUNCTL=$STAGING_BINDIR_NATIVE/tunctl
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if [ ! -x "$TUNCTL" ]; then
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echo "Error: Unable to find tunctl binary in '$STAGING_BINDIR_NATIVE', please bitbake qemu-helper-native"
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exit 1
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fi
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TAP=`$TUNCTL -b $GROUP 2>&1`
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STATUS=$?
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if [ $STATUS -ne 0 ]; then
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# If tunctl -g fails, try using tunctl -u, for older host kernels
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# which do not support the TUNSETGROUP ioctl
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TAP=`$TUNCTL -b $USERID 2>&1`
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STATUS=$?
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if [ $STATUS -ne 0 ]; then
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echo "tunctl failed:"
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exit 1
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fi
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fi
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IFCONFIG=`which ip 2> /dev/null`
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if [ "x$IFCONFIG" = "x" ]; then
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# better than nothing...
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IFCONFIG=/sbin/ip
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fi
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if [ ! -x "$IFCONFIG" ]; then
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echo "$IFCONFIG cannot be executed"
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exit 1
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fi
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IPTABLES=`which iptables 2> /dev/null`
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if [ "x$IPTABLES" = "x" ]; then
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IPTABLES=/sbin/iptables
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fi
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if [ ! -x "$IPTABLES" ]; then
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echo "$IPTABLES cannot be executed"
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exit 1
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fi
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n=$[ (`echo $TAP | sed 's/tap//'` * 2) + 1 ]
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$IFCONFIG addr add 192.168.7.$n/32 broadcast 192.168.7.255 dev $TAP
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STATUS=$?
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if [ $STATUS -ne 0 ]; then
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echo "Failed to set up IP addressing on $TAP"
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exit 1
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fi
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$IFCONFIG link set dev $TAP up
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STATUS=$?
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if [ $STATUS -ne 0 ]; then
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echo "Failed to bring up $TAP"
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exit 1
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fi
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dest=$[ (`echo $TAP | sed 's/tap//'` * 2) + 2 ]
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$IFCONFIG route add to 192.168.7.$dest dev $TAP
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STATUS=$?
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if [ $STATUS -ne 0 ]; then
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echo "Failed to add route to 192.168.7.$dest using $TAP"
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exit 1
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fi
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# setup NAT for tap0 interface to have internet access in QEMU
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$IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$n/32
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$IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$dest/32
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echo 1 > /proc/sys/net/ipv4/ip_forward
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echo 1 > /proc/sys/net/ipv4/conf/$TAP/proxy_arp
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$IPTABLES -P FORWARD ACCEPT
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echo $TAP
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