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Message-ID: <CADXeF1FvJZpVhLO1nHpVBgZoOzZ=6zOnRtkN9m8GsCoyJxMjXw@mail.gmail.com>
Date: Wed, 18 Jun 2025 19:33:18 +0900
From: Yuyang Huang <yuyanghuang@...gle.com>
To: Yuyang Huang <yuyanghuang@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
Shuah Khan <shuah@...nel.org>, netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-kernel@...r.kernel.org, Maciej Żenczykowski <maze@...gle.com>,
Lorenzo Colitti <lorenzo@...gle.com>
Subject: Re: [PATCH net-next, v3] selftest: Add selftest for multicast address notifications
Sorry, please ignore this patch. Accidentally send the old patch again.....
On Wed, Jun 18, 2025 at 7:32 PM Yuyang Huang <yuyanghuang@...gle.com> wrote:
>
> This commit adds a new kernel selftest to verify RTNLGRP_IPV4_MCADDR
> and RTNLGRP_IPV6_MCADDR notifications. The test works by adding and
> removing a dummy interface and then confirming that the system
> correctly receives join and removal notifications for the 224.0.0.1
> and ff02::1 multicast addresses.
>
> The test relies on the iproute2 version to be 6.13+.
>
> Tested by the following command:
> $ vng -v --user root --cpus 16 -- \
> make -C tools/testing/selftests TARGETS=net
> TEST_PROGS=rtnetlink_notification.sh \
> TEST_GEN_PROGS="" run_tests
>
> Cc: Maciej Żenczykowski <maze@...gle.com>
> Cc: Lorenzo Colitti <lorenzo@...gle.com>
> Signed-off-by: Yuyang Huang <yuyanghuang@...gle.com>
> ---
>
> Changelog since v2:
> - Move the test cases to a separate file.
>
> Changelog since v1:
> - Skip the test if the iproute2 is too old.
>
> tools/testing/selftests/net/Makefile | 1 +
> .../selftests/net/rtnetlink_notification.sh | 159 ++++++++++++++++++
> 2 files changed, 160 insertions(+)
> create mode 100755 tools/testing/selftests/net/rtnetlink_notification.sh
>
> diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
> index 70a38f485d4d..ad258b25bc9d 100644
> --- a/tools/testing/selftests/net/Makefile
> +++ b/tools/testing/selftests/net/Makefile
> @@ -40,6 +40,7 @@ TEST_PROGS += netns-name.sh
> TEST_PROGS += link_netns.py
> TEST_PROGS += nl_netdev.py
> TEST_PROGS += rtnetlink.py
> +TEST_PROGS += rtnetlink_notification.sh
> TEST_PROGS += srv6_end_dt46_l3vpn_test.sh
> TEST_PROGS += srv6_end_dt4_l3vpn_test.sh
> TEST_PROGS += srv6_end_dt6_l3vpn_test.sh
> diff --git a/tools/testing/selftests/net/rtnetlink_notification.sh b/tools/testing/selftests/net/rtnetlink_notification.sh
> new file mode 100755
> index 000000000000..a2c1afed5023
> --- /dev/null
> +++ b/tools/testing/selftests/net/rtnetlink_notification.sh
> @@ -0,0 +1,159 @@
> +#!/bin/bash
> +#
> +# This test is for checking rtnetlink notification callpaths, and get as much
> +# coverage as possible.
> +#
> +# set -e
> +
> +ALL_TESTS="
> + kci_test_mcast_addr_notification
> +"
> +
> +VERBOSE=0
> +PAUSE=no
> +PAUSE_ON_FAIL=no
> +
> +source lib.sh
> +
> +# set global exit status, but never reset nonzero one.
> +check_err()
> +{
> + if [ $ret -eq 0 ]; then
> + ret=$1
> + fi
> + [ -n "$2" ] && echo "$2"
> +}
> +
> +run_cmd_common()
> +{
> + local cmd="$*"
> + local out
> + if [ "$VERBOSE" = "1" ]; then
> + echo "COMMAND: ${cmd}"
> + fi
> + out=$($cmd 2>&1)
> + rc=$?
> + if [ "$VERBOSE" = "1" -a -n "$out" ]; then
> + echo " $out"
> + fi
> + return $rc
> +}
> +
> +run_cmd() {
> + run_cmd_common "$@"
> + rc=$?
> + check_err $rc
> + return $rc
> +}
> +
> +end_test()
> +{
> + echo "$*"
> + [ "${VERBOSE}" = "1" ] && echo
> +
> + if [[ $ret -ne 0 ]] && [[ "${PAUSE_ON_FAIL}" = "yes" ]]; then
> + echo "Hit enter to continue"
> + read a
> + fi;
> +
> + if [ "${PAUSE}" = "yes" ]; then
> + echo "Hit enter to continue"
> + read a
> + fi
> +
> +}
> +
> +kci_test_mcast_addr_notification()
> +{
> + local tmpfile
> + local monitor_pid
> + local match_result
> +
> + tmpfile=$(mktemp)
> +
> + ip monitor maddr > $tmpfile &
> + monitor_pid=$!
> + sleep 1
> + if [ ! -e "/proc/$monitor_pid" ]; then
> + end_test "SKIP: mcast addr notification: iproute2 too old"
> + rm $tmpfile
> + return $ksft_skip
> + fi
> +
> + run_cmd ip link add name test-dummy1 type dummy
> + run_cmd ip link set test-dummy1 up
> + run_cmd ip link del dev test-dummy1
> + sleep 1
> +
> + match_result=$(grep -cE "test-dummy1.*(224.0.0.1|ff02::1)" $tmpfile)
> +
> + kill $monitor_pid
> + rm $tmpfile
> + # There should be 4 line matches as follows.
> + # 13: test-dummy1 inet6 mcast ff02::1 scope global
> + # 13: test-dummy1 inet mcast 224.0.0.1 scope global
> + # Deleted 13: test-dummy1 inet mcast 224.0.0.1 scope global
> + # Deleted 13: test-dummy1 inet6 mcast ff02::1 scope global
> + if [ $match_result -ne 4 ];then
> + end_test "FAIL: mcast addr notification"
> + return 1
> + fi
> + end_test "PASS: mcast addr notification"
> +}
> +
> +kci_test_rtnl()
> +{
> + local current_test
> + local ret=0
> +
> + for current_test in ${TESTS:-$ALL_TESTS}; do
> + $current_test
> + check_err $?
> + done
> +
> + return $ret
> +}
> +
> +usage()
> +{
> + cat <<EOF
> +usage: ${0##*/} OPTS
> +
> + -t <test> Test(s) to run (default: all)
> + (options: $(echo $ALL_TESTS))
> + -v Verbose mode (show commands and output)
> + -P Pause after every test
> + -p Pause after every failing test before cleanup (for debugging)
> +EOF
> +}
> +
> +#check for needed privileges
> +if [ "$(id -u)" -ne 0 ];then
> + end_test "SKIP: Need root privileges"
> + exit $ksft_skip
> +fi
> +
> +for x in ip;do
> + $x -Version 2>/dev/null >/dev/null
> + if [ $? -ne 0 ];then
> + end_test "SKIP: Could not run test without the $x tool"
> + exit $ksft_skip
> + fi
> +done
> +
> +while getopts t:hvpP o; do
> + case $o in
> + t) TESTS=$OPTARG;;
> + v) VERBOSE=1;;
> + p) PAUSE_ON_FAIL=yes;;
> + P) PAUSE=yes;;
> + h) usage; exit 0;;
> + *) usage; exit 1;;
> + esac
> +done
> +
> +[ $PAUSE = "yes" ] && PAUSE_ON_FAIL="no"
> +
> +kci_test_rtnl
> +
> +exit $?
> --
> 2.50.0.rc1.591.g9c95f17f64-goog
>
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