selftest: Add selftest for multicast address notifications

Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

kernel os linux

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>

authored by

Yuyang Huang and committed by

Jakub Kicinski 1 year ago e74058f5 67f2efc4

+71

2 changed files

expand all

tools

testing

selftests

net

Makefile

rtnetlink_notification.sh

tools/testing/selftests/net/Makefile

··· 41 41 TEST_PROGS += link_netns.py 42 42 TEST_PROGS += nl_netdev.py 43 43 TEST_PROGS += rtnetlink.py 44 + TEST_PROGS += rtnetlink_notification.sh 44 45 TEST_PROGS += srv6_end_dt46_l3vpn_test.sh 45 46 TEST_PROGS += srv6_end_dt4_l3vpn_test.sh 46 47 TEST_PROGS += srv6_end_dt6_l3vpn_test.sh

+70

tools/testing/selftests/net/rtnetlink_notification.sh

··· 1 + #!/bin/bash 2 + # SPDX-License-Identifier: GPL-2.0 3 + # 4 + # This test is for checking rtnetlink notification callpaths, and get as much 5 + # coverage as possible. 6 + # 7 + # set -e 8 + 9 + ALL_TESTS=" 10 + kci_test_mcast_addr_notification 11 + " 12 + 13 + source lib.sh 14 + 15 + kci_test_mcast_addr_notification() 16 + { 17 + RET=0 18 + local tmpfile 19 + local monitor_pid 20 + local match_result 21 + local test_dev="test-dummy1" 22 + 23 + tmpfile=$(mktemp) 24 + defer rm "$tmpfile" 25 + 26 + ip monitor maddr > $tmpfile & 27 + monitor_pid=$! 28 + defer kill_process "$monitor_pid" 29 + 30 + sleep 1 31 + 32 + if [ ! -e "/proc/$monitor_pid" ]; then 33 + RET=$ksft_skip 34 + log_test "mcast addr notification: iproute2 too old" 35 + return $RET 36 + fi 37 + 38 + ip link add name "$test_dev" type dummy 39 + check_err $? "failed to add dummy interface" 40 + ip link set "$test_dev" up 41 + check_err $? "failed to set dummy interface up" 42 + ip link del dev "$test_dev" 43 + check_err $? "Failed to delete dummy interface" 44 + sleep 1 45 + 46 + # There should be 4 line matches as follows. 47 + # 13: test-dummy1 inet6 mcast ff02::1 scope global 48 + # 13: test-dummy1 inet mcast 224.0.0.1 scope global 49 + # Deleted 13: test-dummy1 inet mcast 224.0.0.1 scope global 50 + # Deleted 13: test-dummy1 inet6 mcast ff02::1 scope global 51 + match_result=$(grep -cE "$test_dev.*(224.0.0.1|ff02::1)" "$tmpfile") 52 + if [ "$match_result" -ne 4 ]; then 53 + RET=$ksft_fail 54 + fi 55 + log_test "mcast addr notification: Expected 4 matches, got $match_result" 56 + return $RET 57 + } 58 + 59 + #check for needed privileges 60 + if [ "$(id -u)" -ne 0 ];then 61 + RET=$ksft_skip 62 + log_test "need root privileges" 63 + exit $RET 64 + fi 65 + 66 + require_command ip 67 + 68 + tests_run 69 + 70 + exit $EXIT_STATUS

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