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Adrian Freihofer 2401847d73 runqemu-ifup: configurable tap names

Feature: Hard-coding the interface names to tap* is not always a good
idea. Introduce an environment variable which allows to change this:
OE_TAP_NAME.

(From OE-Core rev: c9ea17c13935e805a5b7497b14e1f049b0548779)

Signed-off-by: Adrian Freihofer <adrian.freihofer@siemens.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2023-06-24 12:21:48 +01:00

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#!/bin/bash

QEMU network interface configuration script. This utility needs to

be run as root, and will use the ip utility

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:

ALL=NOPASSWD: /path/to/runqemu-ifup

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) " }

if [ $EUID -ne 0 ]; then echo "Error: This script (runqemu-ifup) must be run with root privileges" exit 1 fi

if [ $# -eq 2 ]; then echo "Warning: uid parameter is ignored. It is no longer needed." GROUP="$2" elif [ $# -eq 1 ]; then GROUP="$1" else usage exit 1 fi

if [ -z "$OE_TAP_NAME" ]; then OE_TAP_NAME=tap fi

if taps=$(ip tuntap list 2>/dev/null); then tap_no=$(( $(echo "$taps" |cut -f 1 -d ":" | sed "s/$OE_TAP_NAME//g" | sort -rn | head -n 1) + 1 )) ip tuntap add "$OE_TAP_NAME$tap_no" mode tap group "$GROUP" && TAP="$OE_TAP_NAME$tap_no" fi

if [ -z "$TAP" ]; then echo "Error: Unable to find a tap device to use" exit 1 fi

IPTOOL=which ip 2> /dev/null if [ "x$IPTOOL" = "x" ]; then # better than nothing... IPTOOL=/sbin/ip fi if [ ! -x "$IPTOOL" ]; then echo "$IPTOOL 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 $TAP | sed "s/$OE_TAP_NAME//" * 2) + 1 ] $IPTOOL addr add 192.168.7.$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 $IPTOOL link set dev $TAP up STATUS=$? if [ $STATUS -ne 0 ]; then echo "Failed to bring up $TAP" exit 1 fi

dest=$[ (echo $TAP | sed "s/$OE_TAP_NAME//" * 2) + 2 ] $IPTOOL route add to 192.168.7.$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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