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test/net: Add script for VXLAN underlay in a VRF
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This script tests the support of a VXLAN underlay in a non-default VRF.

It does so by simulating two hypervisors and two VMs, an extended L2
between the VMs with the hypervisors as VTEPs with the underlay in a
VRF, and finally by pinging the two VMs.

It also tests that moving the underlay from a VRF to another works when
down/up the VXLAN interface.

Signed-off-by: Alexis Bauvin <abauvin@scaleway.com>
Reviewed-by: Amine Kherbouche <akherbouche@scaleway.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Tested-by: Amine Kherbouche <akherbouche@scaleway.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Alexis Bauvin authored and David S. Miller committed Dec 3, 2018
1 parent aab8cc3 commit 03f1c26
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2 changes: 1 addition & 1 deletion tools/testing/selftests/net/Makefile
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Expand Up @@ -7,7 +7,7 @@ CFLAGS += -I../../../../usr/include/
TEST_PROGS := run_netsocktests run_afpackettests test_bpf.sh netdevice.sh rtnetlink.sh
TEST_PROGS += fib_tests.sh fib-onlink-tests.sh pmtu.sh udpgso.sh ip_defrag.sh
TEST_PROGS += udpgso_bench.sh fib_rule_tests.sh msg_zerocopy.sh psock_snd.sh
TEST_PROGS += udpgro_bench.sh udpgro.sh
TEST_PROGS += udpgro_bench.sh udpgro.sh test_vxlan_under_vrf.sh
TEST_PROGS_EXTENDED := in_netns.sh
TEST_GEN_FILES = socket
TEST_GEN_FILES += psock_fanout psock_tpacket msg_zerocopy
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129 changes: 129 additions & 0 deletions tools/testing/selftests/net/test_vxlan_under_vrf.sh
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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0

# This test is for checking VXLAN underlay in a non-default VRF.
#
# It simulates two hypervisors running a VM each using four network namespaces:
# two for the HVs, two for the VMs.
# A small VXLAN tunnel is made between the two hypervisors to have the two vms
# in the same virtual L2:
#
# +-------------------+ +-------------------+
# | | | |
# | vm-1 netns | | vm-2 netns |
# | | | |
# | +-------------+ | | +-------------+ |
# | | veth-hv | | | | veth-hv | |
# | | 10.0.0.1/24 | | | | 10.0.0.2/24 | |
# | +-------------+ | | +-------------+ |
# | . | | . |
# +-------------------+ +-------------------+
# . .
# . .
# . .
# +-----------------------------------+ +------------------------------------+
# | . | | . |
# | +----------+ | | +----------+ |
# | | veth-tap | | | | veth-tap | |
# | +----+-----+ | | +----+-----+ |
# | | | | | |
# | +--+--+ +--------------+ | | +--------------+ +--+--+ |
# | | br0 | | vrf-underlay | | | | vrf-underlay | | br0 | |
# | +--+--+ +-------+------+ | | +------+-------+ +--+--+ |
# | | | | | | | |
# | +---+----+ +-------+-------+ | | +-------+-------+ +---+----+ |
# | | vxlan0 |....| veth0 |.|...|.| veth0 |....| vxlan0 | |
# | +--------+ | 172.16.0.1/24 | | | | 172.16.0.2/24 | +--------+ |
# | +---------------+ | | +---------------+ |
# | | | |
# | hv-1 netns | | hv-2 netns |
# | | | |
# +-----------------------------------+ +------------------------------------+
#
# 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.

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 || true
done
}

# Clean start
cleanup &> /dev/null

[[ $1 == "clean" ]] && exit 0

trap cleanup EXIT

# Setup "Hypervisors" simulated with netns
ip link add veth-hv-1 type veth peer name veth-hv-2
setup-hv-networking() {
hv=$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 -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-$hv link add br0 type bridge
ip -netns hv-$hv 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
}
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)
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-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

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)
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 veth0 down
ip -netns hv-1 link set veth0 up
ip -netns hv-2 link set veth0 vrf vrf-underlay
ip -netns hv-2 link set veth0 down
ip -netns hv-2 link set veth0 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)
echo "[ OK ]"

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