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

Signed-off-by: Yuyang Huang yuyanghuang@google.com --- .../selftests/net/rtnetlink_notification.sh | 52 +++++++++++++++++-- 1 file changed, 47 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/net/rtnetlink_notification.sh b/tools/testing/selftests/net/rtnetlink_notification.sh index 39c1b815bbe4..2d938861197c 100755 --- a/tools/testing/selftests/net/rtnetlink_notification.sh +++ b/tools/testing/selftests/net/rtnetlink_notification.sh @@ -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() { @@ -18,12 +20,11 @@ kci_test_mcast_addr_notification() local tmpfile local monitor_pid local match_result - local test_dev="test-dummy1"

tmpfile=$(mktemp) defer rm "$tmpfile"

- ip monitor maddr > $tmpfile & + ip monitor maddr > "$tmpfile" & monitor_pid=$! defer kill_process "$monitor_pid"

@@ -32,7 +33,7 @@ kci_test_mcast_addr_notification() if [ ! -e "/proc/$monitor_pid" ]; then RET=$ksft_skip log_test "mcast addr notification: iproute2 too old" - return $RET + return "$RET" fi

ip link add name "$test_dev" type dummy @@ -53,7 +54,48 @@ kci_test_mcast_addr_notification() RET=$ksft_fail fi log_test "mcast addr notification: Expected 4 matches, got $match_result" - return $RET + return "$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 @@ -67,4 +109,4 @@ require_command ip

tests_run

-exit $EXIT_STATUS +exit "$EXIT_STATUS"