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selftest: Add selftest for multicast address notifications

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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@google.com>
Cc: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: Yuyang Huang <yuyanghuang@google.com>
Link: https://patch.msgid.link/20250614053522.623820-1-yuyanghuang@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Yuyang Huang 2025-06-14 14:35:22 +09:00 committed by Jakub Kicinski
parent 67f2efc478
commit e74058f561
2 changed files with 71 additions and 0 deletions
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1
tools/testing/selftests/net/Makefile
View File

@ -41,6 +41,7 @@ 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

70
tools/testing/selftests/net/rtnetlink_notification.sh Executable file
View File

@ -0,0 +1,70 @@
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# This test is for checking rtnetlink notification callpaths, and get as much
# coverage as possible.
#
# set -e
ALL_TESTS="
kci_test_mcast_addr_notification
"
source lib.sh
kci_test_mcast_addr_notification()
{
RET=0
local tmpfile
local monitor_pid
local match_result
local test_dev="test-dummy1"
tmpfile=$(mktemp)
defer rm "$tmpfile"
ip monitor maddr > $tmpfile &
monitor_pid=$!
defer kill_process "$monitor_pid"
sleep 1
if [ ! -e "/proc/$monitor_pid" ]; then
RET=$ksft_skip
log_test "mcast addr notification: iproute2 too old"
return $RET
fi
ip link add name "$test_dev" type dummy
check_err $? "failed to add dummy interface"
ip link set "$test_dev" up
check_err $? "failed to set dummy interface up"
ip link del dev "$test_dev"
check_err $? "Failed to delete dummy interface"
sleep 1
# There should be 4 line matches as follows.
# 13: test-dummy1    inet6 mcast ff02::1 scope global 
# 13: test-dummy1    inet mcast 224.0.0.1 scope global 
# Deleted 13: test-dummy1    inet mcast 224.0.0.1 scope global 
# Deleted 13: test-dummy1    inet6 mcast ff02::1 scope global 
match_result=$(grep -cE "$test_dev.*(224.0.0.1|ff02::1)" "$tmpfile")
if [ "$match_result" -ne 4 ]; then
RET=$ksft_fail
fi
log_test "mcast addr notification: Expected 4 matches, got $match_result"
return $RET
}
#check for needed privileges
if [ "$(id -u)" -ne 0 ];then
RET=$ksft_skip
log_test "need root privileges"
exit $RET
fi
require_command ip
tests_run
exit $EXIT_STATUS