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-rwxr-xr-xsamples/bpf/test_cgrp2_tc.sh185
1 files changed, 185 insertions, 0 deletions
diff --git a/samples/bpf/test_cgrp2_tc.sh b/samples/bpf/test_cgrp2_tc.sh
new file mode 100755
index 000000000..12faf5847
--- /dev/null
+++ b/samples/bpf/test_cgrp2_tc.sh
@@ -0,0 +1,185 @@
+#!/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.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.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" ] && [ "$MODE" != 'cleanuponly' ]
+ then
+ echo "------ DEBUG ------"
+ echo "mount: "; mount | egrep '(cgroup2|bpf)'; echo
+ echo "$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