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#!/bin/bash
# Kernel configuration options.
OPTIONS=" DEBUG_SPINLOCK DEBUG_ATOMIC_SLEEP DEBUG_MUTEXES DEBUG_RT_MUTEXES"
OPTIONS="$OPTIONS IPV6 IPV6_ROUTER_PREF IPV6_MULTIPLE_TABLES IPV6_ROUTE_INFO"
OPTIONS="$OPTIONS TUN SYN_COOKIES IP_ADVANCED_ROUTER IP_MULTIPLE_TABLES"
OPTIONS="$OPTIONS NETFILTER NETFILTER_ADVANCED NETFILTER_XTABLES"
OPTIONS="$OPTIONS NETFILTER_XT_MARK NETFILTER_XT_TARGET_MARK"
OPTIONS="$OPTIONS IP_NF_IPTABLES IP_NF_MANGLE"
OPTIONS="$OPTIONS IP6_NF_IPTABLES IP6_NF_MANGLE INET6_IPCOMP"
OPTIONS="$OPTIONS IPV6_PRIVACY IPV6_OPTIMISTIC_DAD"
OPTIONS="$OPTIONS CONFIG_NETFILTER_XT_TARGET_NFLOG"
OPTIONS="$OPTIONS CONFIG_NETFILTER_XT_MATCH_QUOTA CONFIG_NETFILTER_XT_MATCH_QUOTA2"
OPTIONS="$OPTIONS CONFIG_NETFILTER_XT_MATCH_QUOTA2_LOG"
OPTIONS="$OPTIONS CONFIG_INET_UDP_DIAG CONFIG_INET_DIAG_DESTROY"
# For 3.1 kernels, where devtmpfs is not on by default.
OPTIONS="$OPTIONS DEVTMPFS DEVTMPFS_MOUNT"
# These two break the flo kernel due to differences in -Werror on recent GCC.
DISABLE_OPTIONS=" CONFIG_REISERFS_FS CONFIG_ANDROID_PMEM"
# This one breaks the fugu kernel due to a nonexistent sem_wait_array.
DISABLE_OPTIONS="$DISABLE_OPTIONS CONFIG_SYSVIPC"
# How many TAP interfaces to create to provide the VM with real network access
# via the host. This requires privileges (e.g., root access) on the host.
#
# This is not needed to run the tests, but can be used, for example, to allow
# the VM to update system packages, or to write tests that need access to a
# real network. The VM does not set up networking by default, but it contains a
# DHCP client and has the ability to use IPv6 autoconfiguration. This script
# does not perform any host-level setup beyond configuring tap interfaces;
# configuring IPv4 NAT and/or IPv6 router advertisements or ND proxying must
# be done separately.
NUMTAPINTERFACES=0
# The root filesystem disk image we'll use.
ROOTFS=net_test.rootfs.20150203
COMPRESSED_ROOTFS=$ROOTFS.xz
URL=https://dl.google.com/dl/android/$COMPRESSED_ROOTFS
# Figure out which test to run.
if [ -z "$1" ]; then
echo "Usage: $0 <test>" >&2
exit 1
fi
consolemode=
testmode=
if [ "$1" = "--builder" ]; then
consolemode="con=null,fd:1"
testmode=builder
shift
fi
test=$1
set -e
# Check if we need to uncompress the disk image.
# We use xz because it compresses better: to 42M vs 72M (gzip) / 62M (bzip2).
cd $(dirname $0)
if [ ! -f $ROOTFS ]; then
echo "Deleting $COMPRESSED_ROOTFS" >&2
rm -f $COMPRESSED_ROOTFS
echo "Downloading $URL" >&2
wget $URL
echo "Uncompressing $COMPRESSED_ROOTFS" >&2
unxz $COMPRESSED_ROOTFS
fi
echo "Using $ROOTFS"
cd -
# If network access was requested, create NUMTAPINTERFACES tap interfaces on
# the host, and prepare UML command line params to use them. The interfaces are
# called <user>TAP0, <user>TAP1, on the host, and eth0, eth1, ..., in the VM.
if (( $NUMTAPINTERFACES > 0 )); then
user=${USER:0:10}
tapinterfaces=
netconfig=
for id in $(seq 0 $(( NUMTAPINTERFACES - 1 )) ); do
tap=${user}TAP$id
tapinterfaces="$tapinterfaces $tap"
mac=$(printf fe:fd:00:00:00:%02x $id)
netconfig="$netconfig eth$id=tuntap,$tap,$mac"
done
for tap in $tapinterfaces; do
if ! ip link list $tap > /dev/null; then
echo "Creating tap interface $tap" >&2
sudo tunctl -u $USER -t $tap
sudo ip link set $tap up
fi
done
fi
if [ -z "$KERNEL_BINARY" ]; then
# Exporting ARCH=um SUBARCH=x86_64 doesn't seem to work, as it "sometimes"
# (?) results in a 32-bit kernel.
# If there's no kernel config at all, create one or UML won't work.
[ -f .config ] || make defconfig ARCH=um SUBARCH=x86_64
# Enable the kernel config options listed in $OPTIONS.
cmdline=${OPTIONS// / -e }
./scripts/config $cmdline
# Disable the kernel config options listed in $DISABLE_OPTIONS.
cmdline=${DISABLE_OPTIONS// / -d }
./scripts/config $cmdline
# olddefconfig doesn't work on old kernels.
if ! make olddefconfig ARCH=um SUBARCH=x86_64 CROSS_COMPILE= ; then
cat >&2 << EOF
Warning: "make olddefconfig" failed.
Perhaps this kernel is too old to support it.
You may get asked lots of questions.
Keep enter pressed to accept the defaults.
EOF
fi
# Compile the kernel.
make -j32 linux ARCH=um SUBARCH=x86_64 CROSS_COMPILE=
KERNEL_BINARY=./linux
fi
# Get the absolute path to the test file that's being run.
dir=/host$(dirname $(readlink -f $0))
# Start the VM.
exec $KERNEL_BINARY umid=net_test ubda=$(dirname $0)/$ROOTFS \
mem=512M init=/sbin/net_test.sh net_test=$dir/$test \
net_test_mode=$testmode $netconfig $consolemode
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