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Patrick Williamsc124f4f2015-09-15 14:41:29 -05001#!/bin/bash
2#
3# QEMU network interface configuration script. This utility needs to
Patrick Williams520786c2023-06-25 16:20:36 -05004# be run as root, and will use the ip utility
Patrick Williamsc124f4f2015-09-15 14:41:29 -05005#
6# If you find yourself calling this script a lot, you can add the
7# the following to your /etc/sudoers file to be able to run this
8# command without entering your password each time:
9#
10# <my-username> ALL=NOPASSWD: /path/to/runqemu-ifup
11# <my-username> ALL=NOPASSWD: /path/to/runqemu-ifdown
12#
13# If you'd like to create a bank of tap devices at once, you should use
14# the runqemu-gen-tapdevs script instead. If tap devices are set up using
15# that script, the runqemu script will never end up calling this
16# script.
17#
18# Copyright (c) 2006-2011 Linux Foundation
19#
Brad Bishopc342db32019-05-15 21:57:59 -040020# SPDX-License-Identifier: GPL-2.0-only
Patrick Williamsc124f4f2015-09-15 14:41:29 -050021#
Patrick Williamsc124f4f2015-09-15 14:41:29 -050022
23usage() {
Patrick Williams520786c2023-06-25 16:20:36 -050024 echo "sudo $(basename $0) <gid>"
Patrick Williamsc124f4f2015-09-15 14:41:29 -050025}
26
27if [ $EUID -ne 0 ]; then
28 echo "Error: This script (runqemu-ifup) must be run with root privileges"
29 exit 1
30fi
31
Patrick Williams520786c2023-06-25 16:20:36 -050032if [ $# -eq 2 ]; then
33 echo "Warning: uid parameter is ignored. It is no longer needed."
34 GROUP="$2"
35elif [ $# -eq 1 ]; then
36 GROUP="$1"
37else
Patrick Williamsc124f4f2015-09-15 14:41:29 -050038 usage
39 exit 1
40fi
41
Patrick Williamsc124f4f2015-09-15 14:41:29 -050042
Patrick Williams520786c2023-06-25 16:20:36 -050043if [ -z "$OE_TAP_NAME" ]; then
44 OE_TAP_NAME=tap
45fi
46
47if taps=$(ip tuntap list 2>/dev/null); then
48 tap_no_last=$(echo "$taps" |cut -f 1 -d ":" |grep -E "^$OE_TAP_NAME.*" |sed "s/$OE_TAP_NAME//g" | sort -rn | head -n 1)
49 if [ -z "$tap_no_last" ]; then
50 tap_no=0
51 else
52 tap_no=$(("$tap_no_last" + 1))
53 fi
54 ip tuntap add "$OE_TAP_NAME$tap_no" mode tap group "$GROUP" && TAP=$OE_TAP_NAME$tap_no
55fi
56
57if [ -z "$TAP" ]; then
58 echo "Error: Unable to find a tap device to use"
Patrick Williamsc124f4f2015-09-15 14:41:29 -050059 exit 1
60fi
61
Patrick Williams520786c2023-06-25 16:20:36 -050062IPTOOL=`which ip 2> /dev/null`
63if [ "x$IPTOOL" = "x" ]; then
Patrick Williamsc124f4f2015-09-15 14:41:29 -050064 # better than nothing...
Patrick Williams520786c2023-06-25 16:20:36 -050065 IPTOOL=/sbin/ip
Patrick Williamsc124f4f2015-09-15 14:41:29 -050066fi
Patrick Williams520786c2023-06-25 16:20:36 -050067if [ ! -x "$IPTOOL" ]; then
68 echo "$IPTOOL cannot be executed"
Patrick Williamsc124f4f2015-09-15 14:41:29 -050069 exit 1
70fi
71
72IPTABLES=`which iptables 2> /dev/null`
73if [ "x$IPTABLES" = "x" ]; then
74 IPTABLES=/sbin/iptables
75fi
76if [ ! -x "$IPTABLES" ]; then
77 echo "$IPTABLES cannot be executed"
78 exit 1
79fi
80
Patrick Williams520786c2023-06-25 16:20:36 -050081n=$[ (`echo $TAP | sed "s/$OE_TAP_NAME//"` * 2) + 1 ]
82$IPTOOL addr add 192.168.7.$n/32 broadcast 192.168.7.255 dev $TAP
Patrick Williamsf1e5d692016-03-30 15:21:19 -050083STATUS=$?
84if [ $STATUS -ne 0 ]; then
85 echo "Failed to set up IP addressing on $TAP"
86 exit 1
87fi
Patrick Williams520786c2023-06-25 16:20:36 -050088$IPTOOL link set dev $TAP up
Patrick Williamsf1e5d692016-03-30 15:21:19 -050089STATUS=$?
90if [ $STATUS -ne 0 ]; then
91 echo "Failed to bring up $TAP"
92 exit 1
93fi
Patrick Williamsc124f4f2015-09-15 14:41:29 -050094
Patrick Williams520786c2023-06-25 16:20:36 -050095dest=$[ (`echo $TAP | sed "s/$OE_TAP_NAME//"` * 2) + 2 ]
96$IPTOOL route add to 192.168.7.$dest dev $TAP
Patrick Williamsf1e5d692016-03-30 15:21:19 -050097STATUS=$?
98if [ $STATUS -ne 0 ]; then
99 echo "Failed to add route to 192.168.7.$dest using $TAP"
100 exit 1
101fi
Patrick Williamsc124f4f2015-09-15 14:41:29 -0500102
103# setup NAT for tap0 interface to have internet access in QEMU
104$IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$n/32
105$IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$dest/32
106echo 1 > /proc/sys/net/ipv4/ip_forward
107echo 1 > /proc/sys/net/ipv4/conf/$TAP/proxy_arp
108$IPTABLES -P FORWARD ACCEPT
109
110echo $TAP