1#!/bin/bash 2 3# Kernel configration options. 4OPTIONS=" IPV6 IPV6_ROUTER_PREF IPV6_MULTIPLE_TABLES IPV6_ROUTE_INFO" 5OPTIONS="$OPTIONS TUN SYN_COOKIES IP_ADVANCED_ROUTER IP_MULTIPLE_TABLES" 6OPTIONS="$OPTIONS NETFILTER NETFILTER_ADVANCED NETFILTER_XTABLES" 7OPTIONS="$OPTIONS NETFILTER_XT_MARK NETFILTER_XT_TARGET_MARK" 8OPTIONS="$OPTIONS IP_NF_IPTABLES IP_NF_MANGLE" 9OPTIONS="$OPTIONS IP6_NF_IPTABLES IP6_NF_MANGLE INET6_IPCOMP" 10OPTIONS="$OPTIONS IPV6_PRIVACY IPV6_OPTIMISTIC_DAD" 11# For 3.1 kernels, where devtmpfs is not on by default. 12OPTIONS="$OPTIONS DEVTMPFS DEVTMPFS_MOUNT" 13 14# How many tap interfaces to create. 15NUMTAPINTERFACES=2 16 17# The root filesystem disk image we'll use. 18ROOTFS=net_test.rootfs.20150203 19COMPRESSED_ROOTFS=$ROOTFS.xz 20URL=https://dl.google.com/dl/android/$COMPRESSED_ROOTFS 21 22# Figure out which test to run. 23if [ -z "$1" ]; then 24 echo "Usage: $0 <test>" >&2 25 exit 1 26fi 27test=$1 28 29set -e 30 31# Check if we need to uncompress the disk image. 32# We use xz because it compresses better: to 42M vs 72M (gzip) / 62M (bzip2). 33cd $(dirname $0) 34if [ ! -f $ROOTFS ]; then 35 echo "Deleting $COMPRESSED_ROOTFS" >&2 36 rm -f $COMPRESSED_ROOTFS 37 echo "Downloading $URL" >&2 38 wget $URL 39 echo "Uncompressing $COMPRESSED_ROOTFS" >&2 40 unxz $COMPRESSED_ROOTFS 41fi 42echo "Using $ROOTFS" 43cd - 44 45# Create NUMTAPINTERFACES tap interfaces on the host, and prepare UML command 46# line params to use them. The interfaces are called <user>TAP0, <user>TAP1, 47# ..., on the host, and eth0, eth1, ..., in the VM. 48user=${USER:0:10} 49tapinterfaces= 50netconfig= 51for id in $(seq 0 $(( NUMTAPINTERFACES - 1 )) ); do 52 tap=${user}TAP$id 53 tapinterfaces="$tapinterfaces $tap" 54 mac=$(printf fe:fd:00:00:00:%02x $id) 55 netconfig="$netconfig eth$id=tuntap,$tap,$mac" 56done 57 58for tap in $tapinterfaces; do 59 if ! ip link list $tap > /dev/null; then 60 echo "Creating tap interface $tap" >&2 61 sudo tunctl -u $USER -t $tap 62 sudo ip link set $tap up 63 fi 64done 65 66# Exporting ARCH=um SUBARCH=x86_64 doesn't seem to work, as it "sometimes" (?) 67# results in a 32-bit kernel. 68 69# If there's no kernel config at all, create one or UML won't work. 70[ -f .config ] || make defconfig ARCH=um SUBARCH=x86_64 71 72# Enable the kernel config options listed in $OPTIONS. 73cmdline=${OPTIONS// / -e } 74./scripts/config $cmdline 75 76# olddefconfig doesn't work on old kernels. 77if ! make olddefconfig ARCH=um SUBARCH=x86_64 CROSS_COMPILE= ; then 78 cat >&2 << EOF 79 80Warning: "make olddefconfig" failed. 81Perhaps this kernel is too old to support it. 82You may get asked lots of questions. 83Keep enter pressed to accept the defaults. 84 85EOF 86fi 87 88# Compile the kernel. 89make -j12 linux ARCH=um SUBARCH=x86_64 CROSS_COMPILE= 90 91# Get the absolute path to the test file that's being run. 92dir=/host$(dirname $(readlink -f $0)) 93 94# Start the VM. 95exec ./linux umid=net_test ubda=$(dirname $0)/$ROOTFS \ 96 mem=512M init=/sbin/net_test.sh net_test=$dir/$test \ 97 $netconfig 98