# 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) | # | | # +-----------------------------------------------------------------------+
. ./lib.sh
ERR=4 # Return 4 by default, which is the SKIP code for kselftest
PING6="ping"
PAUSE_ON_FAIL="no"
# Exit the script after having removed the network namespaces it created
exit_cleanup()
{
cleanup_all_ns
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()
{
setup_ns NS0 NS1 NS2 NS3 || exit_cleanup
}
# 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 "${PEER_IP6}" nodad
}
# Create base networking topology: # # * set up the loopback device in all network namespaces (NS0..NS3), # * set up a veth pair to connect each netns in sequence (NS0 with NS1, # NS1 with NS2, etc.), # * add and IPv4 and an IPv6 address on each veth interface, # * prepare the ingress qdiscs in the intermediate namespaces. #
setup_underlay()
{
ip link add name veth01 netns "${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 "${NS2}" route add 192.0.2.103/32 via 192.0.2.33
}
setup_overlay_ipv6()
{ # Add the overlay IP addresses and route them through the veth devices
ip -netns "${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
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