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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
MY_DIR=$(dirname $0)
# Details on the bpf prog
BPF_CGRP2_ARRAY_NAME='test_cgrp2_array_pin'
BPF_PROG="$MY_DIR/test_cgrp2_tc_kern.o"
BPF_SECTION='filter'
[ -z "$TC" ] && TC='tc'
[ -z "$IP" ] && IP='ip'
# Names of the veth interface, net namespace...etc.
HOST_IFC='ve'
NS_IFC='vens'
NS='ns'
find_mnt() {
cat /proc/mounts | \
awk '{ if ($3 == "'$1'" && mnt == "") { mnt = $2 }} END { print mnt }'
}
# Init cgroup2 vars
init_cgrp2_vars() {
CGRP2_ROOT=$(find_mnt cgroup2)
if [ -z "$CGRP2_ROOT" ]
then
CGRP2_ROOT='/mnt/cgroup2'
MOUNT_CGRP2="yes"
fi
CGRP2_TC="$CGRP2_ROOT/tc"
CGRP2_TC_LEAF="$CGRP2_TC/leaf"
}
# Init bpf fs vars
init_bpf_fs_vars() {
local bpf_fs_root=$(find_mnt bpf)
[ -n "$bpf_fs_root" ] || return -1
BPF_FS_TC_SHARE="$bpf_fs_root/tc/globals"
}
setup_cgrp2() {
case $1 in
start)
if [ "$MOUNT_CGRP2" == 'yes' ]
then
[ -d $CGRP2_ROOT ] || mkdir -p $CGRP2_ROOT
mount -t cgroup2 none $CGRP2_ROOT || return $?
fi
mkdir -p $CGRP2_TC_LEAF
;;
*)
rmdir $CGRP2_TC_LEAF && rmdir $CGRP2_TC
[ "$MOUNT_CGRP2" == 'yes' ] && umount $CGRP2_ROOT
;;
esac
}
setup_bpf_cgrp2_array() {
local bpf_cgrp2_array="$BPF_FS_TC_SHARE/$BPF_CGRP2_ARRAY_NAME"
case $1 in
start)
$MY_DIR/test_cgrp2_array_pin -U $bpf_cgrp2_array -v $CGRP2_TC
;;
*)
[ -d "$BPF_FS_TC_SHARE" ] && rm -f $bpf_cgrp2_array
;;
esac
}
setup_net() {
case $1 in
start)
$IP link add $HOST_IFC type veth peer name $NS_IFC || return $?
$IP link set dev $HOST_IFC up || return $?
sysctl -q net.ipv6.conf.$HOST_IFC.disable_ipv6=0
sysctl -q net.ipv6.conf.$HOST_IFC.accept_dad=0
$IP netns add $NS || return $?
$IP link set dev $NS_IFC netns $NS || return $?
$IP -n $NS link set dev $NS_IFC up || return $?
$IP netns exec $NS sysctl -q net.ipv6.conf.$NS_IFC.disable_ipv6=0
$IP netns exec $NS sysctl -q net.ipv6.conf.$NS_IFC.accept_dad=0
$TC qdisc add dev $HOST_IFC clsact || return $?
$TC filter add dev $HOST_IFC egress bpf da obj $BPF_PROG sec $BPF_SECTION || return $?
;;
*)
$IP netns del $NS
$IP link del $HOST_IFC
;;
esac
}
run_in_cgrp() {
# Fork another bash and move it under the specified cgroup.
# It makes the cgroup cleanup easier at the end of the test.
cmd='echo $$ > '
cmd="$cmd $1/cgroup.procs; exec $2"
bash -c "$cmd"
}
do_test() {
run_in_cgrp $CGRP2_TC_LEAF "ping -6 -c3 ff02::1%$HOST_IFC >& /dev/null"
local dropped=$($TC -s qdisc show dev $HOST_IFC | tail -3 | \
awk '/drop/{print substr($7, 0, index($7, ",")-1)}')
if [[ $dropped -eq 0 ]]
then
echo "FAIL"
return 1
else
echo "Successfully filtered $dropped packets"
return 0
fi
}
do_exit() {
if [ "$DEBUG" == "yes" ] && [ "$MODE" != 'cleanuponly' ]
then
echo "------ DEBUG ------"
echo "mount: "; mount | grep -E '(cgroup2|bpf)'; echo
echo "$CGRP2_TC_LEAF: "; ls -l $CGRP2_TC_LEAF; echo
if [ -d "$BPF_FS_TC_SHARE" ]
then
echo "$BPF_FS_TC_SHARE: "; ls -l $BPF_FS_TC_SHARE; echo
fi
echo "Host net:"
$IP netns
$IP link show dev $HOST_IFC
$IP -6 a show dev $HOST_IFC
$TC -s qdisc show dev $HOST_IFC
echo
echo "$NS net:"
$IP -n $NS link show dev $NS_IFC
$IP -n $NS -6 link show dev $NS_IFC
echo "------ DEBUG ------"
echo
fi
if [ "$MODE" != 'nocleanup' ]
then
setup_net stop
setup_bpf_cgrp2_array stop
setup_cgrp2 stop
fi
}
init_cgrp2_vars
init_bpf_fs_vars
while [[ $# -ge 1 ]]
do
a="$1"
case $a in
debug)
DEBUG='yes'
shift 1
;;
cleanup-only)
MODE='cleanuponly'
shift 1
;;
no-cleanup)
MODE='nocleanup'
shift 1
;;
*)
echo "test_cgrp2_tc [debug] [cleanup-only | no-cleanup]"
echo " debug: Print cgrp and network setup details at the end of the test"
echo " cleanup-only: Try to cleanup things from last test. No test will be run"
echo " no-cleanup: Run the test but don't do cleanup at the end"
echo "[Note: If no arg is given, it will run the test and do cleanup at the end]"
echo
exit -1
;;
esac
done
trap do_exit 0
[ "$MODE" == 'cleanuponly' ] && exit
setup_cgrp2 start || exit $?
setup_net start || exit $?
init_bpf_fs_vars || exit $?
setup_bpf_cgrp2_array start || exit $?
do_test
echo
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