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selftest: add selftest for anycast notifications

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This commit adds a new kernel selftest to verify RTNLGRP_IPV6_ACADDR
notifications. The test works by adding/removing a dummy interface,
enabling packet forwarding, and then confirming that user space can
correctly receive anycast notifications.

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>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuyang Huang
2025-06-19 12:51:16 +09:00
committed by David S. Miller
parent 091d019adc
commit 14966a8df7
1 changed files with 43 additions and 1 deletions
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44
tools/testing/selftests/net/rtnetlink_notification.sh
View File

@@ -8,9 +8,11 @@
ALL_TESTS="
kci_test_mcast_addr_notification
kci_test_anycast_addr_notification
"
source lib.sh
test_dev="test-dummy1"
kci_test_mcast_addr_notification()
{
@@ -18,7 +20,6 @@ kci_test_mcast_addr_notification()
local tmpfile
local monitor_pid
local match_result
local test_dev="test-dummy1"
tmpfile=$(mktemp)
defer rm "$tmpfile"
@@ -56,6 +57,47 @@ kci_test_mcast_addr_notification()
return $RET
}
kci_test_anycast_addr_notification()
{
RET=0
local tmpfile
local monitor_pid
local match_result
tmpfile=$(mktemp)
defer rm "$tmpfile"
ip monitor acaddress > "$tmpfile" &
monitor_pid=$!
defer kill_process "$monitor_pid"
sleep 1
if [ ! -e "/proc/$monitor_pid" ]; then
RET=$ksft_skip
log_test "anycast 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 $? "failed to set dummy interface up"
sysctl -qw net.ipv6.conf."$test_dev".forwarding=1
ip link del dev "$test_dev"
check_err $? "Failed to delete dummy interface"
sleep 1
# There should be 2 line matches as follows.
# 9: dummy2 inet6 any fe80:: scope global
# Deleted 9: dummy2 inet6 any fe80:: scope global
match_result=$(grep -cE "$test_dev.*(fe80::)" "$tmpfile")
if [ "$match_result" -ne 2 ]; then
RET=$ksft_fail
fi
log_test "anycast addr notification: Expected 2 matches, got $match_result"
return "$RET"
}
#check for needed privileges
if [ "$(id -u)" -ne 0 ];then
RET=$ksft_skip