From: Geliang Tang <tanggeliang@kylinos.cn>

This patch includes lib.sh into mptcp_lib.sh, uses setup_ns helper
defined in lib.sh to set up namespaces in mptcp_lib_ns_init(), and
uses cleanup_ns to delete namespaces in mptcp_lib_ns_exit().

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 tools/testing/selftests/net/mptcp/mptcp_lib.sh | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_lib.sh b/tools/testing/selftests/net/mptcp/mptcp_lib.sh
index 16aa080c8229..642a0ee255ef 100644
--- a/tools/testing/selftests/net/mptcp/mptcp_lib.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_lib.sh
@@ -1,6 +1,8 @@
 #! /bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
+. "$(dirname "${0}")/../lib.sh"
+
 readonly KSFT_PASS=0
 readonly KSFT_FAIL=1
 readonly KSFT_SKIP=4
@@ -412,17 +414,10 @@ mptcp_lib_check_tools() {
 }
 
 mptcp_lib_ns_init() {
-	local sec rndh
-
-	sec=$(date +%s)
-	rndh=$(printf %x "${sec}")-$(mktemp -u XXXXXX)
+	setup_ns "${@}"
 
 	local netns
 	for netns in "${@}"; do
-		eval "${netns}=${netns}-${rndh}"
-
-		ip netns add "${!netns}" || exit ${KSFT_SKIP}
-		ip -net "${!netns}" link set lo up
 		ip netns exec "${!netns}" sysctl -q net.mptcp.enabled=1
 		ip netns exec "${!netns}" sysctl -q net.ipv4.conf.all.rp_filter=0
 		ip netns exec "${!netns}" sysctl -q net.ipv4.conf.default.rp_filter=0
@@ -430,9 +425,10 @@ mptcp_lib_ns_init() {
 }
 
 mptcp_lib_ns_exit() {
+	cleanup_ns "${@}"
+
 	local netns
 	for netns in "${@}"; do
-		ip netns del "${netns}"
 		rm -f /tmp/"${netns}".{nstat,out}
 	done
 }
-- 
2.43.0