diff --git a/tools/testing/selftests/net/netfilter/nf_nat_edemux.sh b/tools/testing/selftests/net/netfilter/nf_nat_edemux.sh
index a1aa8f4a5828..1014551dd769 100755
--- a/tools/testing/selftests/net/netfilter/nf_nat_edemux.sh
+++ b/tools/testing/selftests/net/netfilter/nf_nat_edemux.sh
@@ -4,88 +4,60 @@
 # Test NAT source port clash resolution
 #
 
-# Kselftest framework requirement - SKIP code is 4.
-ksft_skip=4
+source lib.sh
 ret=0
-
-sfx=$(mktemp -u "XXXXXXXX")
-ns1="ns1-$sfx"
-ns2="ns2-$sfx"
 socatpid=0
 
 cleanup()
 {
-	[ $socatpid -gt 0 ] && kill $socatpid
-	ip netns del $ns1
-	ip netns del $ns2
-}
-
-socat -h > /dev/null 2>&1
-if [ $? -ne 0 ];then
-	echo "SKIP: Could not run test without socat"
-	exit $ksft_skip
-fi
-
-iptables --version > /dev/null 2>&1
-if [ $? -ne 0 ];then
-	echo "SKIP: Could not run test without iptables"
-	exit $ksft_skip
-fi
+	[ "$socatpid" -gt 0 ] && kill "$socatpid"
 
-ip -Version > /dev/null 2>&1
-if [ $? -ne 0 ];then
-	echo "SKIP: Could not run test without ip tool"
-	exit $ksft_skip
-fi
+	cleanup_all_ns
+}
 
-ip netns add "$ns1"
-if [ $? -ne 0 ];then
-	echo "SKIP: Could not create net namespace $ns1"
-	exit $ksft_skip
-fi
+checktool "socat -h" "run test without socat"
+checktool "iptables --version" "run test without iptables"
 
 trap cleanup EXIT
 
-ip netns add $ns2
+setup_ns ns1 ns2
 
 # Connect the namespaces using a veth pair
 ip link add name veth2 type veth peer name veth1
-ip link set netns $ns1 dev veth1
-ip link set netns $ns2 dev veth2
+ip link set netns "$ns1" dev veth1
+ip link set netns "$ns2" dev veth2
 
-ip netns exec $ns1 ip link set up dev lo
-ip netns exec $ns1 ip link set up dev veth1
-ip netns exec $ns1 ip addr add 192.168.1.1/24 dev veth1
+ip netns exec "$ns1" ip link set up dev lo
+ip netns exec "$ns1" ip link set up dev veth1
+ip netns exec "$ns1" ip addr add 192.168.1.1/24 dev veth1
 
-ip netns exec $ns2 ip link set up dev lo
-ip netns exec $ns2 ip link set up dev veth2
-ip netns exec $ns2 ip addr add 192.168.1.2/24 dev veth2
+ip netns exec "$ns2" ip link set up dev lo
+ip netns exec "$ns2" ip link set up dev veth2
+ip netns exec "$ns2" ip addr add 192.168.1.2/24 dev veth2
 
 # Create a server in one namespace
-ip netns exec $ns1 socat -u TCP-LISTEN:5201,fork OPEN:/dev/null,wronly=1 &
+ip netns exec "$ns1" socat -u TCP-LISTEN:5201,fork OPEN:/dev/null,wronly=1 &
 socatpid=$!
 
 # Restrict source port to just one so we don't have to exhaust
 # all others.
-ip netns exec $ns2 sysctl -q net.ipv4.ip_local_port_range="10000 10000"
+ip netns exec "$ns2" sysctl -q net.ipv4.ip_local_port_range="10000 10000"
 
 # add a virtual IP using DNAT
-ip netns exec $ns2 iptables -t nat -A OUTPUT -d 10.96.0.1/32 -p tcp --dport 443 -j DNAT --to-destination 192.168.1.1:5201
+ip netns exec "$ns2" iptables -t nat -A OUTPUT -d 10.96.0.1/32 -p tcp --dport 443 -j DNAT --to-destination 192.168.1.1:5201
 
 # ... and route it to the other namespace
-ip netns exec $ns2 ip route add 10.96.0.1 via 192.168.1.1
-
-sleep 1
+ip netns exec "$ns2" ip route add 10.96.0.1 via 192.168.1.1
 
 # add a persistent connection from the other namespace
-ip netns exec $ns2 socat -t 10 - TCP:192.168.1.1:5201 > /dev/null &
+ip netns exec "$ns2" socat -t 10 - TCP:192.168.1.1:5201 > /dev/null &
 
 sleep 1
 
 # ip daddr:dport will be rewritten to 192.168.1.1 5201
 # NAT must reallocate source port 10000 because
 # 192.168.1.2:10000 -> 192.168.1.1:5201 is already in use
-echo test | ip netns exec $ns2 socat -t 3 -u STDIN TCP:10.96.0.1:443,connect-timeout=3 >/dev/null
+echo test | ip netns exec "$ns2" socat -t 3 -u STDIN TCP:10.96.0.1:443,connect-timeout=3 >/dev/null
 ret=$?
 
 # Check socat can connect to 10.96.0.1:443 (aka 192.168.1.1:5201).
@@ -96,16 +68,14 @@ else
 fi
 
 # check sport clashres.
-ip netns exec $ns1 iptables -t nat -A PREROUTING -p tcp --dport 5202 -j REDIRECT --to-ports 5201
-ip netns exec $ns1 iptables -t nat -A PREROUTING -p tcp --dport 5203 -j REDIRECT --to-ports 5201
+ip netns exec "$ns1" iptables -t nat -A PREROUTING -p tcp --dport 5202 -j REDIRECT --to-ports 5201
+ip netns exec "$ns1" iptables -t nat -A PREROUTING -p tcp --dport 5203 -j REDIRECT --to-ports 5201
 
-sleep 5 | ip netns exec $ns2 socat -t 5 -u STDIN TCP:192.168.1.1:5202,connect-timeout=5 >/dev/null &
-cpid1=$!
-sleep 1
+sleep 5 | ip netns exec "$ns2" socat -t 5 -u STDIN TCP:192.168.1.1:5202,connect-timeout=5 >/dev/null &
 
 # if connect succeeds, client closes instantly due to EOF on stdin.
 # if connect hangs, it will time out after 5s.
-echo | ip netns exec $ns2 socat -t 3 -u STDIN TCP:192.168.1.1:5203,connect-timeout=5 >/dev/null &
+echo | ip netns exec "$ns2" socat -t 3 -u STDIN TCP:192.168.1.1:5203,connect-timeout=5 >/dev/null &
 cpid2=$!
 
 time_then=$(date +%s)
@@ -117,7 +87,7 @@ time_now=$(date +%s)
 # 'cpid2' to connect and then exit (and no connect delay).
 delta=$((time_now - time_then))
 
-if [ $delta -lt 2 -a $rv -eq 0 ]; then
+if [ $delta -lt 2 ] && [ $rv -eq 0 ]; then
 	echo "PASS: could connect to service via redirected ports"
 else
 	echo "FAIL: socat cannot connect to service via redirect ($delta seconds elapsed, returned $rv)"
