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18df7280ce
The use of sort means that tap10 and tap1 don't sort correctly. Tweak the shell expression to correctly handle numbers of tap devices of 10 or more. (From OE-Core rev: 4c6d0f3ddbb76bde7f35edeb280fe56a9a00f91b) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
99 lines
2.4 KiB
Bash
Executable File
99 lines
2.4 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 ip utility
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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>"
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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 2 ]; 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 $2"
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if taps=$(ip tuntap list 2>/dev/null); then
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tap_no=$(( $(echo "$taps" |cut -f 1 -d ":" | sed 's/tap//g' | sort -rn | head -n 1) + 1 ))
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ip tuntap add tap$tap_no mode tap group $2 && TAP=tap$tap_no
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fi
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if [ -z $TAP ]; then
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echo "Error: Unable to find a tap device to use"
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exit 1
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fi
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IPTOOL=`which ip 2> /dev/null`
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if [ "x$IPTOOL" = "x" ]; then
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# better than nothing...
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IPTOOL=/sbin/ip
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fi
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if [ ! -x "$IPTOOL" ]; then
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echo "$IPTOOL 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 $TAP | sed 's/tap//'` * 2) + 1 ]
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$IPTOOL 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 $TAP"
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exit 1
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fi
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$IPTOOL 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 $TAP | sed 's/tap//'` * 2) + 2 ]
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$IPTOOL 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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