[PATCH net-next v8 13/14] selftests/vsock: add tests for namespace deletion and mode changes

Bobby Eshleman
2025-10-23T18:28:18Z

From: Bobby Eshleman <bobbyeshleman@meta.com>

Add tests that validate vsock sockets are resilient to deleting
namespaces or changing namespace modes from global to local. The vsock
sockets should still function normally.

The function check_ns_changes_dont_break_connection() is added to re-use
the step-by-step logic of 1) setup connections, 2) do something that
would maybe break the connections, 3) check that the connections are
still ok.

Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
---
tools/testing/selftests/vsock/vmtest.sh | 123 ++++++++++++++++++++++++++++++++
1 file changed, 123 insertions(+)

diff --git a/tools/testing/selftests/vsock/vmtest.sh b/tools/testing/selftests/vsock/vmtest.sh
index 60d349c80153..014cecd93858 100755
--- a/tools/testing/selftests/vsock/vmtest.sh
+++ b/tools/testing/selftests/vsock/vmtest.sh
@@ -62,6 +62,12 @@ readonly TEST_NAMES=(
ns_same_local_loopback_ok
ns_same_local_host_connect_to_local_vm_ok
ns_same_local_vm_connect_to_local_host_ok
+ ns_mode_change_connection_continue_vm_ok
+ ns_mode_change_connection_continue_host_ok
+ ns_mode_change_connection_continue_both_ok
+ ns_delete_vm_ok
+ ns_delete_host_ok
+ ns_delete_both_ok
)
readonly TEST_DESCS=(
# vm_server_host_client
@@ -129,6 +135,24 @@ readonly TEST_DESCS=(

# ns_same_local_vm_connect_to_local_host_ok
"Run vsock_test client in VM in a local ns with server in same ns."
+
+ # ns_mode_change_connection_continue_vm_ok
+ "Check that changing NS mode of VM namespace from global to local after a connection is established doesn't break the connection"
+
+ # ns_mode_change_connection_continue_host_ok
+ "Check that changing NS mode of host namespace from global to local after a connection is established doesn't break the connection"
+
+ # ns_mode_change_connection_continue_both_ok
+ "Check that changing NS mode of host and VM namespaces from global to local after a connection is established doesn't break the connection"
+
+ # ns_delete_vm_ok
+ "Check that deleting the VM's namespace does not break the socket connection"
+
+ # ns_delete_host_ok
+ "Check that deleting the host's namespace does not break the socket connection"
+
+ # ns_delete_both_ok
+ "Check that deleting the VM and host's namespaces does not break the socket connection"
)

readonly USE_SHARED_VM=(vm_server_host_client vm_client_host_server vm_loopback)
@@ -1143,6 +1167,105 @@ test_vm_loopback() {
return "${KSFT_PASS}"
}

+check_ns_changes_dont_break_connection() {
+ local ns0="global0"
+ local ns1="global1"
+ local port=12345
+ local pidfile
+ local outfile
+ local pids=()
+ local rc=0
+
+ init_namespaces
+
+ pidfile=$(mktemp $PIDFILE_TEMPLATE)
+ if ! vm_start "${pidfile}" "${ns0}"; then
+ return "${KSFT_FAIL}"
+ fi
+ vm_wait_for_ssh "${ns0}"
+
+ outfile=$(mktemp)
+ vm_ssh "${ns0}" -- \
+ socat VSOCK-LISTEN:"${port}",fork STDOUT > "${outfile}" 2>/dev/null &
+ pids+=($!)
+
+ # wait_for_listener() does not work for vsock because vsock does not
+ # export socket state to /proc/net/. Instead, we have no choice but to
+ # sleep for some hardcoded time.
+ sleep ${WAIT_PERIOD}
+
+ # We use a pipe here so that we can echo into the pipe instead of
+ # using socat and a unix socket file.
+ local pipefile=$(mktemp -u /tmp/vmtest_pipe_XXXX)
+ ip netns exec "${ns1}" \
+ socat PIPE:"${pipefile}" VSOCK-CONNECT:"${VSOCK_CID}":"${port}" &
+ pids+=($!)
+
+ timeout ${WAIT_PERIOD} \
+ bash -c 'while [[ ! -e '"${pipefile}"' ]]; do sleep 1; done; exit 0'
+
+ if [[ $2 == "delete" ]]; then
+ if [[ "$1" == "vm" ]]; then
+ ip netns del "${ns0}"
+ elif [[ "$1" == "host" ]]; then
+ ip netns del "${ns1}"
+ elif [[ "$1" == "both" ]]; then
+ ip netns del "${ns0}"
+ ip netns del "${ns1}"
+ fi
+ elif [[ $2 == "change_mode" ]]; then
+ if [[ "$1" == "vm" ]]; then
+ ns_set_mode "${ns0}" "local"
+ elif [[ "$1" == "host" ]]; then
+ ns_set_mode "${ns1}" "local"
+ elif [[ "$1" == "both" ]]; then
+ ns_set_mode "${ns0}" "local"
+ ns_set_mode "${ns1}" "local"
+ fi
+ fi
+
+ echo "TEST" > "${pipefile}"
+
+ timeout ${WAIT_PERIOD} \
+ bash -c 'while [[ ! -s '"${outfile}"' ]]; do sleep 1; done; exit 0'
+
+ if grep -q "TEST" "${outfile}"; then
+ rc="${KSFT_PASS}"
+ else
+ rc="${KSFT_FAIL}"
+ fi
+
+ terminate_pidfiles "${pidfile}"
+ terminate_pids "${pids[@]}"
+ rm -f "${outfile}"
+
+ return "${rc}"
+}
+
+test_ns_mode_change_connection_continue_vm_ok() {
+ check_ns_changes_dont_break_connection "vm" "change_mode"
+}
+
+test_ns_mode_change_connection_continue_host_ok() {
+ check_ns_changes_dont_break_connection "host" "change_mode"
+}
+
+test_ns_mode_change_connection_continue_both_ok() {
+ check_ns_changes_dont_break_connection "both" "change_mode"
+}
+
+test_ns_delete_vm_ok() {
+ check_ns_changes_dont_break_connection "vm" "delete"
+}
+
+test_ns_delete_host_ok() {
+ check_ns_changes_dont_break_connection "host" "delete"
+}
+
+test_ns_delete_both_ok() {
+ check_ns_changes_dont_break_connection "both" "delete"
+}
+
shared_vm_test() {
local tname

--
2.47.3