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