835525c8bb
The process to set up a tap interface is as follows:
- tap interface is created
- An IP address is assigned to the tap interface
- The interface is bring up
- A route is added to the target using the tap
interface
Of all the previous steps, only the first one is
check if it was sucessful. The status of the others
are ignored and all of them are required to have
basic connectivity in the target.
This patch adds the checks for the rest of the stpes
needed to set up the tap interface.
[YOCTO #8550]
(From OE-Core rev: 52f6bacffc517198f0d1f24e5418ee4c9cb5442a)
Signed-off-by: Mariano Lopez <mariano.lopez@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
122 lines
3.5 KiB
Bash
Executable file
122 lines
3.5 KiB
Bash
Executable file
#!/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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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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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, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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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NATIVE_SYSROOT_DIR=$3
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TUNCTL=$NATIVE_SYSROOT_DIR/usr/bin/tunctl
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if [ ! -x "$TUNCTL" ]; then
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echo "Error: Unable to find tunctl binary in '$NATIVE_SYSROOT_DIR/usr/bin', 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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