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Jörg Sommer d43c41fcaf runqemu-ifupdown/get-tapdevs: Add support for ip tuntap

The *ip* command supports the creation and destruction of TAP devices since
2009 and might be more likely installed on systems then *tunctl*. Therefore
it should be tried to setup or teardown the TAP interface with *ip* before
falling back to *tunctl*.

https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=580fbd88f75cc9eea0d28a48c025b090eb9419a7

(From OE-Core rev: 424ede206baae1c228583aab1df6c18513ac104f)

Signed-off-by: Jörg Sommer <joerg.sommer@navimatix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2023-06-13 22:10:32 +01:00

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#!/bin/bash

Create a "bank" of tap network devices that can be used by the

runqemu script. This script needs to be run as root, and will

use the tunctl binary from the build system 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 the build

system provided version.

Copyright (C) 2010 Intel Corp.

SPDX-License-Identifier: GPL-2.0-only

uid=id -u gid=id -g if [ -n "$SUDO_UID" ]; then uid=$SUDO_UID fi if [ -n "$SUDO_GID" ]; then gid=$SUDO_GID fi

usage() { echo "Usage: sudo $0 <staging_bindir_native>" echo "Where is the numeric user id the tap devices will be owned by" echo "Where is the numeric group id the tap devices will be owned by" echo " is the number of tap devices to create (0 to remove all)" echo " is the path to the build system's native sysroot" echo "For example:" echo "$ bitbake qemu-helper-native" echo "$ sudo $0 $uid $gid 4 tmp/sysroots-components/x86_64/qemu-helper-native/usr/bin" echo "" exit 1 }

if [ $# -ne 4 ]; then echo "Error: Incorrect number of arguments" usage fi

TUID=$1 GID=$2 COUNT=$3 STAGING_BINDIR_NATIVE=$4

check if COUNT is a number and >= 0

if ! [ $COUNT -ge 0 ]; then echo "Error: Incorrect count: $COUNT" exit 1 fi

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

SCRIPT_DIR=dirname $0 RUNQEMU_IFUP="$SCRIPT_DIR/runqemu-ifup" if [ ! -x "$RUNQEMU_IFUP" ]; then echo "Error: Unable to find the runqemu-ifup script in $SCRIPT_DIR" exit 1 fi

TUNCTL=$STAGING_BINDIR_NATIVE/tunctl ip_supports_tuntap=false if interfaces=ip tuntap list 2>/dev/null; then ip_supports_tuntap=true interfaces=echo "$interfaces |cut -f1 -d: elif ! -x "$TUNCTL" ; then echo "Error: $TUNCTL is not an executable" usage elif interfaces=ip link 2>/dev/null; then interfaces=echo "$interfaces" | sed '/^[0-9]\+: $docker[0-9]\+$:.*/!d; s//\1/' else echo "Failed to call 'ip link'" >&2 exit 1 fi

Ensure we start with a clean slate

for tap in $interfaces; do echo "Note: Destroying pre-existing tap interface $tap..." if $ip_supports_tuntap; then ip tuntap del $tap mode tap else $TUNCTL -d $tap fi done rm -f /etc/runqemu-nosudo

if [ $COUNT -eq 0 ]; then exit 0 fi

echo "Creating $COUNT tap devices for UID: $TUID GID: $GID..." for ((index=0; index < $COUNT; index++)); do echo "Creating tap$index" if ! ifup=$RUNQEMU_IFUP $TUID $GID $STAGING_BINDIR_NATIVE 2>&1; then echo "Error running tunctl: $ifup" exit 1 fi done

echo "Note: For systems running NetworkManager, it's recommended" echo "Note: that the tap devices be set as unmanaged in the" echo "Note: NetworkManager.conf file. Add the following lines to" echo "Note: /etc/NetworkManager/NetworkManager.conf" echo "[keyfile]" echo "unmanaged-devices=interface-name:tap*"

The runqemu script will check for this file, and if it exists,

will use the existing bank of tap devices without creating

additional ones via sudo.

touch /etc/runqemu-nosudo

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