selftests/net: convert test_vxlan_under_vrf.sh to run it in unique namespace

Here is the test result after conversion.

]# ./test_vxlan_under_vrf.sh
Checking HV connectivity                                           [ OK ]
Check VM connectivity through VXLAN (underlay in the default VRF)  [ OK ]
Check VM connectivity through VXLAN (underlay in a VRF)            [ OK ]
Acked-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Tested-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/test_vxlan_under_vrf.sh

@@ -43,15 +43,14 @@
 # This tests both the connectivity between vm-1 and vm-2, and that the underlay
 # can be moved in and out of the vrf by unsetting and setting veth0's master.
 
+source lib.sh
 set -e
 
 cleanup() {
     ip link del veth-hv-1 2>/dev/null || true
     ip link del veth-tap 2>/dev/null || true
 
-    for ns in hv-1 hv-2 vm-1 vm-2; do
-        ip netns del $ns 2>/dev/null || true
-    done
+    cleanup_ns $hv_1 $hv_2 $vm_1 $vm_2
 }
 
 # Clean start
@@ -60,72 +59,75 @@ cleanup &> /dev/null
 [[ $1 == "clean" ]] && exit 0
 
 trap cleanup EXIT
+setup_ns hv_1 hv_2 vm_1 vm_2
+hv[1]=$hv_1
+hv[2]=$hv_2
+vm[1]=$vm_1
+vm[2]=$vm_2
 
 # Setup "Hypervisors" simulated with netns
 ip link add veth-hv-1 type veth peer name veth-hv-2
 setup-hv-networking() {
-    hv=$1
+    id=$1
 
-    ip netns add hv-$hv
-    ip link set veth-hv-$hv netns hv-$hv
-    ip -netns hv-$hv link set veth-hv-$hv name veth0
+    ip link set veth-hv-$id netns ${hv[$id]}
+    ip -netns ${hv[$id]} link set veth-hv-$id name veth0
 
-    ip -netns hv-$hv link add vrf-underlay type vrf table 1
-    ip -netns hv-$hv link set vrf-underlay up
-    ip -netns hv-$hv addr add 172.16.0.$hv/24 dev veth0
-    ip -netns hv-$hv link set veth0 up
+    ip -netns ${hv[$id]} link add vrf-underlay type vrf table 1
+    ip -netns ${hv[$id]} link set vrf-underlay up
+    ip -netns ${hv[$id]} addr add 172.16.0.$id/24 dev veth0
+    ip -netns ${hv[$id]} link set veth0 up
 
-    ip -netns hv-$hv link add br0 type bridge
-    ip -netns hv-$hv link set br0 up
+    ip -netns ${hv[$id]} link add br0 type bridge
+    ip -netns ${hv[$id]} link set br0 up
 
-    ip -netns hv-$hv link add vxlan0 type vxlan id 10 local 172.16.0.$hv dev veth0 dstport 4789
-    ip -netns hv-$hv link set vxlan0 master br0
-    ip -netns hv-$hv link set vxlan0 up
+    ip -netns ${hv[$id]} link add vxlan0 type vxlan id 10 local 172.16.0.$id dev veth0 dstport 4789
+    ip -netns ${hv[$id]} link set vxlan0 master br0
+    ip -netns ${hv[$id]} link set vxlan0 up
 }
 setup-hv-networking 1
 setup-hv-networking 2
 
 # Check connectivity between HVs by pinging hv-2 from hv-1
 echo -n "Checking HV connectivity                                           "
-ip netns exec hv-1 ping -c 1 -W 1 172.16.0.2 &> /dev/null || (echo "[FAIL]"; false)
+ip netns exec $hv_1 ping -c 1 -W 1 172.16.0.2 &> /dev/null || (echo "[FAIL]"; false)
 echo "[ OK ]"
 
 # Setups a "VM" simulated by a netns an a veth pair
 setup-vm() {
     id=$1
 
-    ip netns add vm-$id
     ip link add veth-tap type veth peer name veth-hv
 
-    ip link set veth-tap netns hv-$id
-    ip -netns hv-$id link set veth-tap master br0
-    ip -netns hv-$id link set veth-tap up
+    ip link set veth-tap netns ${hv[$id]}
+    ip -netns ${hv[$id]} link set veth-tap master br0
+    ip -netns ${hv[$id]} link set veth-tap up
 
     ip link set veth-hv address 02:1d:8d:dd:0c:6$id
 
-    ip link set veth-hv netns vm-$id
-    ip -netns vm-$id addr add 10.0.0.$id/24 dev veth-hv
-    ip -netns vm-$id link set veth-hv up
+    ip link set veth-hv netns ${vm[$id]}
+    ip -netns ${vm[$id]} addr add 10.0.0.$id/24 dev veth-hv
+    ip -netns ${vm[$id]} link set veth-hv up
 }
 setup-vm 1
 setup-vm 2
 
 # Setup VTEP routes to make ARP work
-bridge -netns hv-1 fdb add 00:00:00:00:00:00 dev vxlan0 dst 172.16.0.2 self permanent
-bridge -netns hv-2 fdb add 00:00:00:00:00:00 dev vxlan0 dst 172.16.0.1 self permanent
+bridge -netns $hv_1 fdb add 00:00:00:00:00:00 dev vxlan0 dst 172.16.0.2 self permanent
+bridge -netns $hv_2 fdb add 00:00:00:00:00:00 dev vxlan0 dst 172.16.0.1 self permanent
 
 echo -n "Check VM connectivity through VXLAN (underlay in the default VRF)  "
-ip netns exec vm-1 ping -c 1 -W 1 10.0.0.2 &> /dev/null || (echo "[FAIL]"; false)
+ip netns exec $vm_1 ping -c 1 -W 1 10.0.0.2 &> /dev/null || (echo "[FAIL]"; false)
 echo "[ OK ]"
 
 # Move the underlay to a non-default VRF
-ip -netns hv-1 link set veth0 vrf vrf-underlay
-ip -netns hv-1 link set vxlan0 down
-ip -netns hv-1 link set vxlan0 up
-ip -netns hv-2 link set veth0 vrf vrf-underlay
-ip -netns hv-2 link set vxlan0 down
-ip -netns hv-2 link set vxlan0 up
+ip -netns $hv_1 link set veth0 vrf vrf-underlay
+ip -netns $hv_1 link set vxlan0 down
+ip -netns $hv_1 link set vxlan0 up
+ip -netns $hv_2 link set veth0 vrf vrf-underlay
+ip -netns $hv_2 link set vxlan0 down
+ip -netns $hv_2 link set vxlan0 up
 
 echo -n "Check VM connectivity through VXLAN (underlay in a VRF)            "
-ip netns exec vm-1 ping -c 1 -W 1 10.0.0.2 &> /dev/null || (echo "[FAIL]"; false)
+ip netns exec $vm_1 ping -c 1 -W 1 10.0.0.2 &> /dev/null || (echo "[FAIL]"; false)
 echo "[ OK ]"