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 | # |
Brad Bishop | c342db3 | 2019-05-15 21:57:59 -0400 | [diff] [blame^] | 23 | # SPDX-License-Identifier: GPL-2.0-only |
Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 24 | # |
Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 25 | |
| 26 | usage() { |
| 27 | echo "sudo $(basename $0) <uid> <gid> <native-sysroot-basedir>" |
| 28 | } |
| 29 | |
| 30 | if [ $EUID -ne 0 ]; then |
| 31 | echo "Error: This script (runqemu-ifup) must be run with root privileges" |
| 32 | exit 1 |
| 33 | fi |
| 34 | |
| 35 | if [ $# -ne 3 ]; then |
| 36 | usage |
| 37 | exit 1 |
| 38 | fi |
| 39 | |
| 40 | USERID="-u $1" |
| 41 | GROUP="-g $2" |
Brad Bishop | 6e60e8b | 2018-02-01 10:27:11 -0500 | [diff] [blame] | 42 | STAGING_BINDIR_NATIVE=$3 |
Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 43 | |
Brad Bishop | 6e60e8b | 2018-02-01 10:27:11 -0500 | [diff] [blame] | 44 | TUNCTL=$STAGING_BINDIR_NATIVE/tunctl |
Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 45 | if [ ! -x "$TUNCTL" ]; then |
Brad Bishop | 6e60e8b | 2018-02-01 10:27:11 -0500 | [diff] [blame] | 46 | echo "Error: Unable to find tunctl binary in '$STAGING_BINDIR_NATIVE', please bitbake qemu-helper-native" |
Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 47 | exit 1 |
| 48 | fi |
| 49 | |
| 50 | TAP=`$TUNCTL -b $GROUP 2>&1` |
| 51 | STATUS=$? |
| 52 | if [ $STATUS -ne 0 ]; then |
| 53 | # If tunctl -g fails, try using tunctl -u, for older host kernels |
| 54 | # which do not support the TUNSETGROUP ioctl |
| 55 | TAP=`$TUNCTL -b $USERID 2>&1` |
| 56 | STATUS=$? |
| 57 | if [ $STATUS -ne 0 ]; then |
| 58 | echo "tunctl failed:" |
| 59 | exit 1 |
| 60 | fi |
| 61 | fi |
| 62 | |
| 63 | IFCONFIG=`which ip 2> /dev/null` |
| 64 | if [ "x$IFCONFIG" = "x" ]; then |
| 65 | # better than nothing... |
| 66 | IFCONFIG=/sbin/ip |
| 67 | fi |
| 68 | if [ ! -x "$IFCONFIG" ]; then |
| 69 | echo "$IFCONFIG cannot be executed" |
| 70 | exit 1 |
| 71 | fi |
| 72 | |
| 73 | IPTABLES=`which iptables 2> /dev/null` |
| 74 | if [ "x$IPTABLES" = "x" ]; then |
| 75 | IPTABLES=/sbin/iptables |
| 76 | fi |
| 77 | if [ ! -x "$IPTABLES" ]; then |
| 78 | echo "$IPTABLES cannot be executed" |
| 79 | exit 1 |
| 80 | fi |
| 81 | |
| 82 | n=$[ (`echo $TAP | sed 's/tap//'` * 2) + 1 ] |
| 83 | $IFCONFIG addr add 192.168.7.$n/32 broadcast 192.168.7.255 dev $TAP |
Patrick Williams | f1e5d69 | 2016-03-30 15:21:19 -0500 | [diff] [blame] | 84 | STATUS=$? |
| 85 | if [ $STATUS -ne 0 ]; then |
| 86 | echo "Failed to set up IP addressing on $TAP" |
| 87 | exit 1 |
| 88 | fi |
Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 89 | $IFCONFIG link set dev $TAP up |
Patrick Williams | f1e5d69 | 2016-03-30 15:21:19 -0500 | [diff] [blame] | 90 | STATUS=$? |
| 91 | if [ $STATUS -ne 0 ]; then |
| 92 | echo "Failed to bring up $TAP" |
| 93 | exit 1 |
| 94 | fi |
Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 95 | |
| 96 | dest=$[ (`echo $TAP | sed 's/tap//'` * 2) + 2 ] |
| 97 | $IFCONFIG route add to 192.168.7.$dest dev $TAP |
Patrick Williams | f1e5d69 | 2016-03-30 15:21:19 -0500 | [diff] [blame] | 98 | STATUS=$? |
| 99 | if [ $STATUS -ne 0 ]; then |
| 100 | echo "Failed to add route to 192.168.7.$dest using $TAP" |
| 101 | exit 1 |
| 102 | fi |
Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 103 | |
| 104 | # setup NAT for tap0 interface to have internet access in QEMU |
| 105 | $IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$n/32 |
| 106 | $IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$dest/32 |
| 107 | echo 1 > /proc/sys/net/ipv4/ip_forward |
| 108 | echo 1 > /proc/sys/net/ipv4/conf/$TAP/proxy_arp |
| 109 | $IPTABLES -P FORWARD ACCEPT |
| 110 | |
| 111 | echo $TAP |