Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 1 | #!/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 | |
| 36 | usage() { |
| 37 | echo "sudo $(basename $0) <uid> <gid> <native-sysroot-basedir>" |
| 38 | } |
| 39 | |
| 40 | if [ $EUID -ne 0 ]; then |
| 41 | echo "Error: This script (runqemu-ifup) must be run with root privileges" |
| 42 | exit 1 |
| 43 | fi |
| 44 | |
| 45 | if [ $# -ne 3 ]; then |
| 46 | usage |
| 47 | exit 1 |
| 48 | fi |
| 49 | |
| 50 | USERID="-u $1" |
| 51 | GROUP="-g $2" |
| 52 | NATIVE_SYSROOT_DIR=$3 |
| 53 | |
| 54 | TUNCTL=$NATIVE_SYSROOT_DIR/usr/bin/tunctl |
| 55 | if [ ! -x "$TUNCTL" ]; then |
| 56 | echo "Error: Unable to find tunctl binary in '$NATIVE_SYSROOT_DIR/usr/bin', please bitbake qemu-helper-native" |
| 57 | exit 1 |
| 58 | fi |
| 59 | |
| 60 | TAP=`$TUNCTL -b $GROUP 2>&1` |
| 61 | STATUS=$? |
| 62 | if [ $STATUS -ne 0 ]; then |
| 63 | # If tunctl -g fails, try using tunctl -u, for older host kernels |
| 64 | # which do not support the TUNSETGROUP ioctl |
| 65 | TAP=`$TUNCTL -b $USERID 2>&1` |
| 66 | STATUS=$? |
| 67 | if [ $STATUS -ne 0 ]; then |
| 68 | echo "tunctl failed:" |
| 69 | exit 1 |
| 70 | fi |
| 71 | fi |
| 72 | |
| 73 | IFCONFIG=`which ip 2> /dev/null` |
| 74 | if [ "x$IFCONFIG" = "x" ]; then |
| 75 | # better than nothing... |
| 76 | IFCONFIG=/sbin/ip |
| 77 | fi |
| 78 | if [ ! -x "$IFCONFIG" ]; then |
| 79 | echo "$IFCONFIG cannot be executed" |
| 80 | exit 1 |
| 81 | fi |
| 82 | |
| 83 | IPTABLES=`which iptables 2> /dev/null` |
| 84 | if [ "x$IPTABLES" = "x" ]; then |
| 85 | IPTABLES=/sbin/iptables |
| 86 | fi |
| 87 | if [ ! -x "$IPTABLES" ]; then |
| 88 | echo "$IPTABLES cannot be executed" |
| 89 | exit 1 |
| 90 | fi |
| 91 | |
| 92 | n=$[ (`echo $TAP | sed 's/tap//'` * 2) + 1 ] |
| 93 | $IFCONFIG addr add 192.168.7.$n/32 broadcast 192.168.7.255 dev $TAP |
Patrick Williams | f1e5d69 | 2016-03-30 15:21:19 -0500 | [diff] [blame^] | 94 | STATUS=$? |
| 95 | if [ $STATUS -ne 0 ]; then |
| 96 | echo "Failed to set up IP addressing on $TAP" |
| 97 | exit 1 |
| 98 | fi |
Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 99 | $IFCONFIG link set dev $TAP up |
Patrick Williams | f1e5d69 | 2016-03-30 15:21:19 -0500 | [diff] [blame^] | 100 | STATUS=$? |
| 101 | if [ $STATUS -ne 0 ]; then |
| 102 | echo "Failed to bring up $TAP" |
| 103 | exit 1 |
| 104 | fi |
Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 105 | |
| 106 | dest=$[ (`echo $TAP | sed 's/tap//'` * 2) + 2 ] |
| 107 | $IFCONFIG route add to 192.168.7.$dest dev $TAP |
Patrick Williams | f1e5d69 | 2016-03-30 15:21:19 -0500 | [diff] [blame^] | 108 | STATUS=$? |
| 109 | if [ $STATUS -ne 0 ]; then |
| 110 | echo "Failed to add route to 192.168.7.$dest using $TAP" |
| 111 | exit 1 |
| 112 | fi |
Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 113 | |
| 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 |
| 117 | echo 1 > /proc/sys/net/ipv4/ip_forward |
| 118 | echo 1 > /proc/sys/net/ipv4/conf/$TAP/proxy_arp |
| 119 | $IPTABLES -P FORWARD ACCEPT |
| 120 | |
| 121 | echo $TAP |