#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# Test various bareudp tunnel configurations.
#
# The bareudp module allows to tunnel network protocols like IP or MPLS over
# UDP, without adding any intermediate header. This scripts tests several
# configurations of bareudp (using IPv4 or IPv6 as underlay and transporting
# IPv4, IPv6 or MPLS packets on the overlay).
#
# Network topology:
#
# * A chain of 4 network namespaces, connected with veth pairs. Each veth
# is assigned an IPv4 and an IPv6 address. A host-route allows a veth to
# join its peer.
#
# * NS0 and NS3 are at the extremities of the chain. They have additional
# IPv4 and IPv6 addresses on their loopback device. Routes are added in NS0
# and NS3, so that they can communicate using these overlay IP addresses.
# For IPv4 and IPv6 reachability tests, the route simply sets the peer's
# veth address as gateway. For MPLS reachability tests, an MPLS header is
# also pushed before the IP header.
#
# * NS1 and NS2 are the intermediate namespaces. They use a bareudp device to
# encapsulate the traffic into UDP.
#
# +-----------------------------------------------------------------------+
# | NS0 |
# | |
# | lo: |
# | * IPv4 address: 192.0.2.100/32 |
# | * IPv6 address: 2001:db8::100/128 |
# | * IPv6 address: 2001:db8::200/128 |
# | * IPv4 route: 192.0.2.103/32 reachable via 192.0.2.11 |
# | * IPv6 route: 2001:db8::103/128 reachable via 2001:db8::11 |
# | * IPv6 route: 2001:db8::203/128 reachable via 2001:db8::11 |
# | (encapsulated with MPLS label 203) |
# | |
# | veth01: |
# | ^ * IPv4 address: 192.0.2.10, peer 192.0.2.11/32 |
# | | * IPv6 address: 2001:db8::10, peer 2001:db8::11/128 |
# | | |
# +---+-------------------------------------------------------------------+
# |
# | Traffic type: IP or MPLS (depending on test)
# |
# +---+-------------------------------------------------------------------+
# | | NS1 |
# | | |
# | v |
# | veth10: |
# | * IPv4 address: 192.0.2.11, peer 192.0.2.10/32 |
# | * IPv6 address: 2001:db8::11, peer 2001:db8::10/128 |
# | |
# | bareudp_ns1: |
# | * Encapsulate IP or MPLS packets received on veth10 into UDP |
# | and send the resulting packets through veth12. |
# | * Decapsulate bareudp packets (either IP or MPLS, over UDP) |
# | received on veth12 and send the inner packets through veth10. |
# | |
# | veth12: |
# | ^ * IPv4 address: 192.0.2.21, peer 192.0.2.22/32 |
# | | * IPv6 address: 2001:db8::21, peer 2001:db8::22/128 |
# | | |
# +---+-------------------------------------------------------------------+
# |
# | Traffic type: IP or MPLS (depending on test), over UDP
# |
# +---+-------------------------------------------------------------------+
# | | NS2 |
# | | |
# | v |
# | veth21: |
# | * IPv4 address: 192.0.2.22, peer 192.0.2.21/32 |
# | * IPv6 address: 2001:db8::22, peer 2001:db8::21/128 |
# | |
# | bareudp_ns2: |
# | * Decapsulate bareudp packets (either IP or MPLS, over UDP) |
# | received on veth21 and send the inner packets through veth23. |
# | * Encapsulate IP or MPLS packets received on veth23 into UDP |
# | and send the resulting packets through veth21. |
# | |
# | veth23: |
# | ^ * IPv4 address: 192.0.2.32, peer 192.0.2.33/32 |
# | | * IPv6 address: 2001:db8::32, peer 2001:db8::33/128 |
# | | |
# +---+-------------------------------------------------------------------+
# |
# | Traffic type: IP or MPLS (depending on test)
# |
# +---+-------------------------------------------------------------------+
# | | NS3 |
# | v |
# | veth32: |
# | * IPv4 address: 192.0.2.33, peer 192.0.2.32/32 |
# | * IPv6 address: 2001:db8::33, peer 2001:db8::32/128 |
# | |
# | lo: |
# | * IPv4 address: 192.0.2.103/32 |
# | * IPv6 address: 2001:db8::103/128 |
# | * IPv6 address: 2001:db8::203/128 |
# | * IPv4 route: 192.0.2.100/32 reachable via 192.0.2.32 |
# | * IPv6 route: 2001:db8::100/128 reachable via 2001:db8::32 |
# | * IPv6 route: 2001:db8::200/128 reachable via 2001:db8::32 |
# | (encapsulated with MPLS label 200) |
# | |
# +-----------------------------------------------------------------------+
ERR=4 # Return 4 by default, which is the SKIP code for kselftest
PING6="ping"
PAUSE_ON_FAIL="no"
readonly NS0=$(mktemp -u ns0-XXXXXXXX)
readonly NS1=$(mktemp -u ns1-XXXXXXXX)
readonly NS2=$(mktemp -u ns2-XXXXXXXX)
readonly NS3=$(mktemp -u ns3-XXXXXXXX)
# Exit the script after having removed the network namespaces it created
#
# Parameters:
#
# * The list of network namespaces to delete before exiting.
#
exit_cleanup()
{
for ns in "$@"; do
ip netns delete "${ns}" 2>/dev/null || true
done
if [ "${ERR}" -eq 4 ]; then
echo "Error: Setting up the testing environment failed." >&2
fi
exit "${ERR}"
}
# Create the four network namespaces used by the script (NS0, NS1, NS2 and NS3)
#
# New namespaces are cleaned up manually in case of error, to ensure that only
# namespaces created by this script are deleted.
create_namespaces()
{
ip netns add "${NS0}" || exit_cleanup
ip netns add "${NS1}" || exit_cleanup "${NS0}"
ip netns add "${NS2}" || exit_cleanup "${NS0}" "${NS1}"
ip netns add "${NS3}" || exit_cleanup "${NS0}" "${NS1}" "${NS2}"
}
# The trap function handler
#
exit_cleanup_all()
{
exit_cleanup "${NS0}" "${NS1}" "${NS2}" "${NS3}"
}
# Configure a network interface using a host route
#
# Parameters
#
# * $1: the netns the network interface resides in,
# * $2: the network interface name,
# * $3: the local IPv4 address to assign to this interface,
# * $4: the IPv4 address of the remote network interface,
# * $5: the local IPv6 address to assign to this interface,
# * $6: the IPv6 address of the remote network interface.
#
iface_config()
{
local NS="${1}"; readonly NS
local DEV="${2}"; readonly DEV
local LOCAL_IP4="${3}"; readonly LOCAL_IP4
local PEER_IP4="${4}"; readonly PEER_IP4
local LOCAL_IP6="${5}"; readonly LOCAL_IP6
local PEER_IP6="${6}"; readonly PEER_IP6
ip -netns "${NS}" link set dev "${DEV}" up
ip -netns "${NS}" address add dev "${DEV}" "${LOCAL_IP4}" peer "${PEER_IP4}"
ip -netns "${NS}" address add dev "${DEV}" "${LOCAL_IP6}" peer "${PEER_IP6}" nodad
}
# Create base networking topology:
#
# * set up the loopback device in all network namespaces (NS0..NS3),
# * set up a veth pair to connect each netns in sequence (NS0 with NS1,
# NS1 with NS2, etc.),
# * add and IPv4 and an IPv6 address on each veth interface,
# * prepare the ingress qdiscs in the intermediate namespaces.
#
setup_underlay()
{
for ns in "${NS0}" "${NS1}" "${NS2}" "${NS3}"; do
ip -netns "${ns}" link set dev lo up
done;
ip link add name veth01 netns "${NS0}" type veth peer name veth10 netns "${NS1}"
ip link add name veth12 netns "${NS1}" type veth peer name veth21 netns "${NS2}"
ip link add name veth23 netns "${NS2}" type veth peer name veth32 netns "${NS3}"
iface_config "${NS0}" veth01 192.0.2.10 192.0.2.11/32 2001:db8::10 2001:db8::11/128
iface_config "${NS1}" veth10 192.0.2.11 192.0.2.10/32 2001:db8::11 2001:db8::10/128
iface_config "${NS1}" veth12 192.0.2.21 192.0.2.22/32 2001:db8::21 2001:db8::22/128
iface_config "${NS2}" veth21 192.0.2.22 192.0.2.21/32 2001:db8::22 2001:db8::21/128
iface_config "${NS2}" veth23 192.0.2.32 192.0.2.33/32 2001:db8::32 2001:db8::33/128
iface_config "${NS3}" veth32 192.0.2.33 192.0.2.32/32 2001:db8::33 2001:db8::32/128
tc -netns "${NS1}" qdisc add dev veth10 ingress
tc -netns "${NS2}" qdisc add dev veth23 ingress
}
# Set up the IPv4, IPv6 and MPLS overlays.
#
# Configuration is similar for all protocols:
#
# * add an overlay IP address on the loopback interface of each edge
# namespace,
# * route these IP addresses via the intermediate namespaces (for the MPLS
# tests, this is also where MPLS encapsulation is done),
# * add routes for these IP addresses (or MPLS labels) in the intermediate
# namespaces.
#
# The bareudp encapsulation isn't configured in setup_overlay_*(). That will be
# done just before running the reachability tests.
setup_overlay_ipv4()
{
# Add the overlay IP addresses and route them through the veth devices
ip -netns "${NS0}" address add 192.0.2.100/32 dev lo
ip -netns "${NS3}" address add 192.0.2.103/32 dev lo
ip -netns "${NS0}" route add 192.0.2.103/32 src 192.0.2.100 via 192.0.2.11
ip -netns "${NS3}" route add 192.0.2.100/32 src 192.0.2.103 via 192.0.2.32
# Route the overlay addresses in the intermediate namespaces
# (used after bareudp decapsulation)
ip netns exec "${NS1}" sysctl -qw net.ipv4.ip_forward=1
ip netns exec "${NS2}" sysctl -qw net.ipv4.ip_forward=1
ip -netns "${NS1}" route add 192.0.2.100/32 via 192.0.2.10
ip -netns "${NS2}" route add 192.0.2.103/32 via 192.0.2.33
# The intermediate namespaces don't have routes for the reverse path,
# as it will be handled by tc. So we need to ensure that rp_filter is
# not going to block the traffic.
ip netns exec "${NS1}" sysctl -qw net.ipv4.conf.all.rp_filter=0
ip netns exec "${NS2}" sysctl -qw net.ipv4.conf.all.rp_filter=0
ip netns exec "${NS1}" sysctl -qw net.ipv4.conf.default.rp_filter=0
ip netns exec "${NS2}" sysctl -qw net.ipv4.conf.default.rp_filter=0
}
setup_overlay_ipv6()
{
# Add the overlay IP addresses and route them through the veth devices
ip -netns "${NS0}" address add 2001:db8::100/128 dev lo
ip -netns "${NS3}" address add 2001:db8::103/128 dev lo
ip -netns "${NS0}" route add 2001:db8::103/128 src 2001:db8::100 via 2001:db8::11
ip -netns "${NS3}" route add 2001:db8::100/128 src 2001:db8::103 via 2001:db8::32
# Route the overlay addresses in the intermediate namespaces
# (used after bareudp decapsulation)
ip netns exec "${NS1}" sysctl -qw net.ipv6.conf.all.forwarding=1
ip netns exec "${NS2}" sysctl -qw net.ipv6.conf.all.forwarding=1
ip -netns "${NS1}" route add 2001:db8::100/128 via 2001:db8::10
ip -netns "${NS2}" route add 2001:db8::103/128 via 2001:db8::33
}
setup_overlay_mpls()
{
# Add specific overlay IP addresses, routed over MPLS
ip -netns "${NS0}" address add 2001:db8::200/128 dev lo
ip -netns "${NS3}" address add 2001:db8::203/128 dev lo
ip -netns "${NS0}" route add 2001:db8::203/128 src 2001:db8::200 encap mpls 203 via 2001:db8::11
ip -netns "${NS3}" route add 2001:db8::200/128 src 2001:db8::203 encap mpls 200 via 2001:db8::32
# Route the MPLS packets in the intermediate namespaces
# (used after bareudp decapsulation)
ip netns exec "${NS1}" sysctl -qw net.mpls.platform_labels=256
ip netns exec "${NS2}" sysctl -qw net.mpls.platform_labels=256
ip -netns "${NS1}" -family mpls route add 200 via inet6 2001:db8::10
ip -netns "${NS2}" -family mpls route add 203 via inet6 2001:db8::33
}
# Run "ping" from NS0 and print the result
#
# Parameters:
#
# * $1: the variant of ping to use (normally either "ping" or "ping6"),
# * $2: the IP address to ping,
# * $3: a human readable description of the purpose of the test.
#
# If the test fails and PAUSE_ON_FAIL is active, the user is given the
# possibility to continue with the next test or to quit immediately.
#
ping_test_one()
{
local PING="$1"; readonly PING
local IP="$2"; readonly IP
local MSG="$3"; readonly MSG
local RET
printf "TEST: %-60s " "${MSG}"
set +e
ip netns exec "${NS0}" "${PING}" -w 5 -c 1 "${IP}" > /dev/null 2>&1
RET=$?
set -e
if [ "${RET}" -eq 0 ]; then
printf "[ OK ]\n"
else
ERR=1
printf "[FAIL]\n"
if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
printf "\nHit enter to continue, 'q' to quit\n"
read a
if [ "$a" = "q" ]; then
exit 1
fi
fi
fi
}
# Run reachability tests
#
# Parameters:
#
# * $1: human readable string describing the underlay protocol.
#
# $IPV4, $IPV6, $MPLS_UC and $MULTIPROTO are inherited from the calling
# function.
#
ping_test()
{
local UNDERLAY="$1"; readonly UNDERLAY
local MODE
local MSG
if [ "${MULTIPROTO}" = "multiproto" ]; then
MODE=" (multiproto mode)"
else
MODE=""
fi
if [ $IPV4 ]; then
ping_test_one "ping" "192.0.2.103" "IPv4 packets over ${UNDERLAY}${MODE}"
fi
if [ $IPV6 ]; then
ping_test_one "${PING6}" "2001:db8::103" "IPv6 packets over ${UNDERLAY}${MODE}"
fi
if [ $MPLS_UC ]; then
ping_test_one "${PING6}" "2001:db8::203" "Unicast MPLS packets over ${UNDERLAY}${MODE}"
fi
}
# Set up a bareudp overlay and run reachability tests over IPv4 and IPv6
#
# Parameters:
#
# * $1: the packet type (protocol) to be handled by bareudp,
# * $2: a flag to activate or deactivate bareudp's "multiproto" mode.
#
test_overlay()
{
local ETHERTYPE="$1"; readonly ETHERTYPE
local MULTIPROTO="$2"; readonly MULTIPROTO
local IPV4
local IPV6
local MPLS_UC
case "${ETHERTYPE}" in
"ipv4")
IPV4="ipv4"
if [ "${MULTIPROTO}" = "multiproto" ]; then
IPV6="ipv6"
else
IPV6=""
fi
MPLS_UC=""
;;
"ipv6")
IPV6="ipv6"
IPV4=""
MPLS_UC=""
;;
"mpls_uc")
MPLS_UC="mpls_uc"
IPV4=""
IPV6=""
;;
*)
exit 1
;;
esac
readonly IPV4
readonly IPV6
readonly MPLS_UC
# Create the bareudp devices in the intermediate namespaces
ip -netns "${NS1}" link add name bareudp_ns1 up type bareudp dstport 6635 ethertype "${ETHERTYPE}" "${MULTIPROTO}"
ip -netns "${NS2}" link add name bareudp_ns2 up type bareudp dstport 6635 ethertype "${ETHERTYPE}" "${MULTIPROTO}"
# IPv4 over UDPv4
if [ $IPV4 ]; then
# Encapsulation instructions for bareudp over IPv4
tc -netns "${NS1}" filter add dev veth10 ingress protocol ipv4 \
flower dst_ip 192.0.2.103/32 \
action tunnel_key set src_ip 192.0.2.21 dst_ip 192.0.2.22 id 0 \
action mirred egress redirect dev bareudp_ns1
tc -netns "${NS2}" filter add dev veth23 ingress protocol ipv4 \
flower dst_ip 192.0.2.100/32 \
action tunnel_key set src_ip 192.0.2.22 dst_ip 192.0.2.21 id 0 \
action mirred egress redirect dev bareudp_ns2
fi
# IPv6 over UDPv4
if [ $IPV6 ]; then
# Encapsulation instructions for bareudp over IPv4
tc -netns "${NS1}" filter add dev veth10 ingress protocol ipv6 \
flower dst_ip 2001:db8::103/128 \
action tunnel_key set src_ip 192.0.2.21 dst_ip 192.0.2.22 id 0 \
action mirred egress redirect dev bareudp_ns1
tc -netns "${NS2}" filter add dev veth23 ingress protocol ipv6 \
flower dst_ip 2001:db8::100/128 \
action tunnel_key set src_ip 192.0.2.22 dst_ip 192.0.2.21 id 0 \
action mirred egress redirect dev bareudp_ns2
fi
# MPLS (unicast) over UDPv4
if [ $MPLS_UC ]; then
ip netns exec "${NS1}" sysctl -qw net.mpls.conf.bareudp_ns1.input=1
ip netns exec "${NS2}" sysctl -qw net.mpls.conf.bareudp_ns2.input=1
# Encapsulation instructions for bareudp over IPv4
tc -netns "${NS1}" filter add dev veth10 ingress protocol mpls_uc \
flower mpls_label 203 \
action tunnel_key set src_ip 192.0.2.21 dst_ip 192.0.2.22 id 0 \
action mirred egress redirect dev bareudp_ns1
tc -netns "${NS2}" filter add dev veth23 ingress protocol mpls_uc \
flower mpls_label 200 \
action tunnel_key set src_ip 192.0.2.22 dst_ip 192.0.2.21 id 0 \
action mirred egress redirect dev bareudp_ns2
fi
# Test IPv4 underlay
ping_test "UDPv4"
# Cleanup bareudp encapsulation instructions, as they were specific to
# the IPv4 underlay, before setting up and testing the IPv6 underlay
tc -netns "${NS1}" filter delete dev veth10 ingress
tc -netns "${NS2}" filter delete dev veth23 ingress
# IPv4 over UDPv6
if [ $IPV4 ]; then
# New encapsulation instructions for bareudp over IPv6
tc -netns "${NS1}" filter add dev veth10 ingress protocol ipv4 \
flower dst_ip 192.0.2.103/32 \
action tunnel_key set src_ip 2001:db8::21 dst_ip 2001:db8::22 id 0 \
action mirred egress redirect dev bareudp_ns1
tc -netns "${NS2}" filter add dev veth23 ingress protocol ipv4 \
flower dst_ip 192.0.2.100/32 \
action tunnel_key set src_ip 2001:db8::22 dst_ip 2001:db8::21 id 0 \
action mirred egress redirect dev bareudp_ns2
fi
# IPv6 over UDPv6
if [ $IPV6 ]; then
# New encapsulation instructions for bareudp over IPv6
tc -netns "${NS1}" filter add dev veth10 ingress protocol ipv6 \
flower dst_ip 2001:db8::103/128 \
action tunnel_key set src_ip 2001:db8::21 dst_ip 2001:db8::22 id 0 \
action mirred egress redirect dev bareudp_ns1
tc -netns "${NS2}" filter add dev veth23 ingress protocol ipv6 \
flower dst_ip 2001:db8::100/128 \
action tunnel_key set src_ip 2001:db8::22 dst_ip 2001:db8::21 id 0 \
action mirred egress redirect dev bareudp_ns2
fi
# MPLS (unicast) over UDPv6
if [ $MPLS_UC ]; then
# New encapsulation instructions for bareudp over IPv6
tc -netns "${NS1}" filter add dev veth10 ingress protocol mpls_uc \
flower mpls_label 203 \
action tunnel_key set src_ip 2001:db8::21 dst_ip 2001:db8::22 id 0 \
action mirred egress redirect dev bareudp_ns1
tc -netns "${NS2}" filter add dev veth23 ingress protocol mpls_uc \
flower mpls_label 200 \
action tunnel_key set src_ip 2001:db8::22 dst_ip 2001:db8::21 id 0 \
action mirred egress redirect dev bareudp_ns2
fi
# Test IPv6 underlay
ping_test "UDPv6"
tc -netns "${NS1}" filter delete dev veth10 ingress
tc -netns "${NS2}" filter delete dev veth23 ingress
ip -netns "${NS1}" link delete bareudp_ns1
ip -netns "${NS2}" link delete bareudp_ns2
}
check_features()
{
ip link help 2>&1 | grep -q bareudp
if [ $? -ne 0 ]; then
echo "Missing bareudp support in iproute2" >&2
exit_cleanup
fi
# Use ping6 on systems where ping doesn't handle IPv6
ping -w 1 -c 1 ::1 > /dev/null 2>&1 || PING6="ping6"
}
usage()
{
echo "Usage: $0 [-p]"
exit 1
}
while getopts :p o
do
case $o in
p) PAUSE_ON_FAIL="yes";;
*) usage;;
esac
done
check_features
# Create namespaces before setting up the exit trap.
# Otherwise, exit_cleanup_all() could delete namespaces that were not created
# by this script.
create_namespaces
set -e
trap exit_cleanup_all EXIT
setup_underlay
setup_overlay_ipv4
setup_overlay_ipv6
setup_overlay_mpls
test_overlay ipv4 nomultiproto
test_overlay ipv6 nomultiproto
test_overlay ipv4 multiproto
test_overlay mpls_uc nomultiproto
if [ "${ERR}" -eq 1 ]; then
echo "Some tests failed." >&2
else
ERR=0
fi
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