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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
4# be run as root, and will use the tunctl binary from a native sysroot.
5# Note: many Linux distros these days still use an older version of
6# tunctl which does not support the group permissions option, hence
7# the need to use build system's version.
8#
9# If you find yourself calling this script a lot, you can add the
10# the following to your /etc/sudoers file to be able to run this
11# command without entering your password each time:
12#
13# <my-username> ALL=NOPASSWD: /path/to/runqemu-ifup
14# <my-username> ALL=NOPASSWD: /path/to/runqemu-ifdown
15#
16# If you'd like to create a bank of tap devices at once, you should use
17# the runqemu-gen-tapdevs script instead. If tap devices are set up using
18# that script, the runqemu script will never end up calling this
19# script.
20#
21# Copyright (c) 2006-2011 Linux Foundation
22#
23# This program is free software; you can redistribute it and/or modify
24# it under the terms of the GNU General Public License version 2 as
25# published by the Free Software Foundation.
26#
27# This program is distributed in the hope that it will be useful,
28# but WITHOUT ANY WARRANTY; without even the implied warranty of
29# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30# GNU General Public License for more details.
31#
32# You should have received a copy of the GNU General Public License along
33# with this program; if not, write to the Free Software Foundation, Inc.,
34# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
35
36usage() {
37 echo "sudo $(basename $0) <uid> <gid> <native-sysroot-basedir>"
38}
39
40if [ $EUID -ne 0 ]; then
41 echo "Error: This script (runqemu-ifup) must be run with root privileges"
42 exit 1
43fi
44
45if [ $# -ne 3 ]; then
46 usage
47 exit 1
48fi
49
50USERID="-u $1"
51GROUP="-g $2"
Brad Bishop6e60e8b2018-02-01 10:27:11 -050052STAGING_BINDIR_NATIVE=$3
Patrick Williamsc124f4f2015-09-15 14:41:29 -050053
Brad Bishop6e60e8b2018-02-01 10:27:11 -050054TUNCTL=$STAGING_BINDIR_NATIVE/tunctl
Patrick Williamsc124f4f2015-09-15 14:41:29 -050055if [ ! -x "$TUNCTL" ]; then
Brad Bishop6e60e8b2018-02-01 10:27:11 -050056 echo "Error: Unable to find tunctl binary in '$STAGING_BINDIR_NATIVE', please bitbake qemu-helper-native"
Patrick Williamsc124f4f2015-09-15 14:41:29 -050057 exit 1
58fi
59
60TAP=`$TUNCTL -b $GROUP 2>&1`
61STATUS=$?
62if [ $STATUS -ne 0 ]; then
63# If tunctl -g fails, try using tunctl -u, for older host kernels
64# which do not support the TUNSETGROUP ioctl
65 TAP=`$TUNCTL -b $USERID 2>&1`
66 STATUS=$?
67 if [ $STATUS -ne 0 ]; then
68 echo "tunctl failed:"
69 exit 1
70 fi
71fi
72
73IFCONFIG=`which ip 2> /dev/null`
74if [ "x$IFCONFIG" = "x" ]; then
75 # better than nothing...
76 IFCONFIG=/sbin/ip
77fi
78if [ ! -x "$IFCONFIG" ]; then
79 echo "$IFCONFIG cannot be executed"
80 exit 1
81fi
82
83IPTABLES=`which iptables 2> /dev/null`
84if [ "x$IPTABLES" = "x" ]; then
85 IPTABLES=/sbin/iptables
86fi
87if [ ! -x "$IPTABLES" ]; then
88 echo "$IPTABLES cannot be executed"
89 exit 1
90fi
91
92n=$[ (`echo $TAP | sed 's/tap//'` * 2) + 1 ]
93$IFCONFIG addr add 192.168.7.$n/32 broadcast 192.168.7.255 dev $TAP
Patrick Williamsf1e5d692016-03-30 15:21:19 -050094STATUS=$?
95if [ $STATUS -ne 0 ]; then
96 echo "Failed to set up IP addressing on $TAP"
97 exit 1
98fi
Patrick Williamsc124f4f2015-09-15 14:41:29 -050099$IFCONFIG link set dev $TAP up
Patrick Williamsf1e5d692016-03-30 15:21:19 -0500100STATUS=$?
101if [ $STATUS -ne 0 ]; then
102 echo "Failed to bring up $TAP"
103 exit 1
104fi
Patrick Williamsc124f4f2015-09-15 14:41:29 -0500105
106dest=$[ (`echo $TAP | sed 's/tap//'` * 2) + 2 ]
107$IFCONFIG route add to 192.168.7.$dest dev $TAP
Patrick Williamsf1e5d692016-03-30 15:21:19 -0500108STATUS=$?
109if [ $STATUS -ne 0 ]; then
110 echo "Failed to add route to 192.168.7.$dest using $TAP"
111 exit 1
112fi
Patrick Williamsc124f4f2015-09-15 14:41:29 -0500113
114# setup NAT for tap0 interface to have internet access in QEMU
115$IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$n/32
116$IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$dest/32
117echo 1 > /proc/sys/net/ipv4/ip_forward
118echo 1 > /proc/sys/net/ipv4/conf/$TAP/proxy_arp
119$IPTABLES -P FORWARD ACCEPT
120
121echo $TAP