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e865802357
When working on the rp_filter problem, I didn't realise that disabling it on the network devices didn't cover all cases: rp_filter could also be enabled globally in the namespace, in which case it would drop packets, even if the net device has rp_filter=0. Fixes:1ccd58331f("selftests: disable rp_filter when testing bareudp") Fixes:bbbc7aa45e("selftests: add test script for bareudp tunnels") Signed-off-by: Guillaume Nault <gnault@redhat.com> Link: https://lore.kernel.org/r/f2d459346471f163b239aa9d63ce3e2ba9c62895.1605107012.git.gnault@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
547 lines
21 KiB
Bash
Executable File
547 lines
21 KiB
Bash
Executable File
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# Test various bareudp tunnel configurations.
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#
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# The bareudp module allows to tunnel network protocols like IP or MPLS over
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# UDP, without adding any intermediate header. This scripts tests several
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# configurations of bareudp (using IPv4 or IPv6 as underlay and transporting
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# IPv4, IPv6 or MPLS packets on the overlay).
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#
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# Network topology:
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#
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# * A chain of 4 network namespaces, connected with veth pairs. Each veth
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# is assigned an IPv4 and an IPv6 address. A host-route allows a veth to
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# join its peer.
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#
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# * NS0 and NS3 are at the extremities of the chain. They have additional
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# IPv4 and IPv6 addresses on their loopback device. Routes are added in NS0
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# and NS3, so that they can communicate using these overlay IP addresses.
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# For IPv4 and IPv6 reachability tests, the route simply sets the peer's
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# veth address as gateway. For MPLS reachability tests, an MPLS header is
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# also pushed before the IP header.
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#
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# * NS1 and NS2 are the intermediate namespaces. They use a bareudp device to
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# encapsulate the traffic into UDP.
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#
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# +-----------------------------------------------------------------------+
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# | NS0 |
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# | |
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# | lo: |
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# | * IPv4 address: 192.0.2.100/32 |
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# | * IPv6 address: 2001:db8::100/128 |
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# | * IPv6 address: 2001:db8::200/128 |
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# | * IPv4 route: 192.0.2.103/32 reachable via 192.0.2.11 |
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# | * IPv6 route: 2001:db8::103/128 reachable via 2001:db8::11 |
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# | * IPv6 route: 2001:db8::203/128 reachable via 2001:db8::11 |
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# | (encapsulated with MPLS label 203) |
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# | |
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# | veth01: |
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# | ^ * IPv4 address: 192.0.2.10, peer 192.0.2.11/32 |
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# | | * IPv6 address: 2001:db8::10, peer 2001:db8::11/128 |
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# | | |
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# +---+-------------------------------------------------------------------+
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# |
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# | Traffic type: IP or MPLS (depending on test)
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# |
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# +---+-------------------------------------------------------------------+
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# | | NS1 |
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# | | |
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# | v |
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# | veth10: |
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# | * IPv4 address: 192.0.2.11, peer 192.0.2.10/32 |
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# | * IPv6 address: 2001:db8::11, peer 2001:db8::10/128 |
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# | |
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# | bareudp_ns1: |
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# | * Encapsulate IP or MPLS packets received on veth10 into UDP |
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# | and send the resulting packets through veth12. |
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# | * Decapsulate bareudp packets (either IP or MPLS, over UDP) |
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# | received on veth12 and send the inner packets through veth10. |
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# | |
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# | veth12: |
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# | ^ * IPv4 address: 192.0.2.21, peer 192.0.2.22/32 |
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# | | * IPv6 address: 2001:db8::21, peer 2001:db8::22/128 |
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# | | |
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# +---+-------------------------------------------------------------------+
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# |
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# | Traffic type: IP or MPLS (depending on test), over UDP
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# |
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# +---+-------------------------------------------------------------------+
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# | | NS2 |
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# | | |
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# | v |
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# | veth21: |
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# | * IPv4 address: 192.0.2.22, peer 192.0.2.21/32 |
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# | * IPv6 address: 2001:db8::22, peer 2001:db8::21/128 |
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# | |
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# | bareudp_ns2: |
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# | * Decapsulate bareudp packets (either IP or MPLS, over UDP) |
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# | received on veth21 and send the inner packets through veth23. |
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# | * Encapsulate IP or MPLS packets received on veth23 into UDP |
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# | and send the resulting packets through veth21. |
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# | |
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# | veth23: |
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# | ^ * IPv4 address: 192.0.2.32, peer 192.0.2.33/32 |
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# | | * IPv6 address: 2001:db8::32, peer 2001:db8::33/128 |
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# | | |
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# +---+-------------------------------------------------------------------+
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# |
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# | Traffic type: IP or MPLS (depending on test)
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# |
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# +---+-------------------------------------------------------------------+
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# | | NS3 |
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# | v |
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# | veth32: |
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# | * IPv4 address: 192.0.2.33, peer 192.0.2.32/32 |
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# | * IPv6 address: 2001:db8::33, peer 2001:db8::32/128 |
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# | |
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# | lo: |
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# | * IPv4 address: 192.0.2.103/32 |
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# | * IPv6 address: 2001:db8::103/128 |
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# | * IPv6 address: 2001:db8::203/128 |
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# | * IPv4 route: 192.0.2.100/32 reachable via 192.0.2.32 |
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# | * IPv6 route: 2001:db8::100/128 reachable via 2001:db8::32 |
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# | * IPv6 route: 2001:db8::200/128 reachable via 2001:db8::32 |
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# | (encapsulated with MPLS label 200) |
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# | |
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# +-----------------------------------------------------------------------+
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ERR=4 # Return 4 by default, which is the SKIP code for kselftest
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PING6="ping"
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PAUSE_ON_FAIL="no"
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readonly NS0=$(mktemp -u ns0-XXXXXXXX)
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readonly NS1=$(mktemp -u ns1-XXXXXXXX)
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readonly NS2=$(mktemp -u ns2-XXXXXXXX)
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readonly NS3=$(mktemp -u ns3-XXXXXXXX)
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# Exit the script after having removed the network namespaces it created
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#
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# Parameters:
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#
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# * The list of network namespaces to delete before exiting.
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#
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exit_cleanup()
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{
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for ns in "$@"; do
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ip netns delete "${ns}" 2>/dev/null || true
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done
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if [ "${ERR}" -eq 4 ]; then
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echo "Error: Setting up the testing environment failed." >&2
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fi
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exit "${ERR}"
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}
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# Create the four network namespaces used by the script (NS0, NS1, NS2 and NS3)
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#
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# New namespaces are cleaned up manually in case of error, to ensure that only
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# namespaces created by this script are deleted.
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create_namespaces()
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{
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ip netns add "${NS0}" || exit_cleanup
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ip netns add "${NS1}" || exit_cleanup "${NS0}"
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ip netns add "${NS2}" || exit_cleanup "${NS0}" "${NS1}"
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ip netns add "${NS3}" || exit_cleanup "${NS0}" "${NS1}" "${NS2}"
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}
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# The trap function handler
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#
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exit_cleanup_all()
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{
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exit_cleanup "${NS0}" "${NS1}" "${NS2}" "${NS3}"
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}
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# Configure a network interface using a host route
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#
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# Parameters
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#
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# * $1: the netns the network interface resides in,
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# * $2: the network interface name,
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# * $3: the local IPv4 address to assign to this interface,
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# * $4: the IPv4 address of the remote network interface,
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# * $5: the local IPv6 address to assign to this interface,
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# * $6: the IPv6 address of the remote network interface.
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#
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iface_config()
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{
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local NS="${1}"; readonly NS
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local DEV="${2}"; readonly DEV
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local LOCAL_IP4="${3}"; readonly LOCAL_IP4
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local PEER_IP4="${4}"; readonly PEER_IP4
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local LOCAL_IP6="${5}"; readonly LOCAL_IP6
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local PEER_IP6="${6}"; readonly PEER_IP6
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ip -netns "${NS}" link set dev "${DEV}" up
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ip -netns "${NS}" address add dev "${DEV}" "${LOCAL_IP4}" peer "${PEER_IP4}"
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ip -netns "${NS}" address add dev "${DEV}" "${LOCAL_IP6}" peer "${PEER_IP6}" nodad
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}
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# Create base networking topology:
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#
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# * set up the loopback device in all network namespaces (NS0..NS3),
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# * set up a veth pair to connect each netns in sequence (NS0 with NS1,
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# NS1 with NS2, etc.),
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# * add and IPv4 and an IPv6 address on each veth interface,
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# * prepare the ingress qdiscs in the intermediate namespaces.
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#
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setup_underlay()
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{
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for ns in "${NS0}" "${NS1}" "${NS2}" "${NS3}"; do
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ip -netns "${ns}" link set dev lo up
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done;
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ip link add name veth01 netns "${NS0}" type veth peer name veth10 netns "${NS1}"
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ip link add name veth12 netns "${NS1}" type veth peer name veth21 netns "${NS2}"
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ip link add name veth23 netns "${NS2}" type veth peer name veth32 netns "${NS3}"
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iface_config "${NS0}" veth01 192.0.2.10 192.0.2.11/32 2001:db8::10 2001:db8::11/128
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iface_config "${NS1}" veth10 192.0.2.11 192.0.2.10/32 2001:db8::11 2001:db8::10/128
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iface_config "${NS1}" veth12 192.0.2.21 192.0.2.22/32 2001:db8::21 2001:db8::22/128
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iface_config "${NS2}" veth21 192.0.2.22 192.0.2.21/32 2001:db8::22 2001:db8::21/128
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iface_config "${NS2}" veth23 192.0.2.32 192.0.2.33/32 2001:db8::32 2001:db8::33/128
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iface_config "${NS3}" veth32 192.0.2.33 192.0.2.32/32 2001:db8::33 2001:db8::32/128
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tc -netns "${NS1}" qdisc add dev veth10 ingress
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tc -netns "${NS2}" qdisc add dev veth23 ingress
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}
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# Set up the IPv4, IPv6 and MPLS overlays.
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#
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# Configuration is similar for all protocols:
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#
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# * add an overlay IP address on the loopback interface of each edge
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# namespace,
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# * route these IP addresses via the intermediate namespaces (for the MPLS
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# tests, this is also where MPLS encapsulation is done),
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# * add routes for these IP addresses (or MPLS labels) in the intermediate
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# namespaces.
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#
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# The bareudp encapsulation isn't configured in setup_overlay_*(). That will be
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# done just before running the reachability tests.
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setup_overlay_ipv4()
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{
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# Add the overlay IP addresses and route them through the veth devices
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ip -netns "${NS0}" address add 192.0.2.100/32 dev lo
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ip -netns "${NS3}" address add 192.0.2.103/32 dev lo
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ip -netns "${NS0}" route add 192.0.2.103/32 src 192.0.2.100 via 192.0.2.11
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ip -netns "${NS3}" route add 192.0.2.100/32 src 192.0.2.103 via 192.0.2.32
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# Route the overlay addresses in the intermediate namespaces
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# (used after bareudp decapsulation)
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ip netns exec "${NS1}" sysctl -qw net.ipv4.ip_forward=1
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ip netns exec "${NS2}" sysctl -qw net.ipv4.ip_forward=1
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ip -netns "${NS1}" route add 192.0.2.100/32 via 192.0.2.10
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ip -netns "${NS2}" route add 192.0.2.103/32 via 192.0.2.33
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# The intermediate namespaces don't have routes for the reverse path,
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# as it will be handled by tc. So we need to ensure that rp_filter is
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# not going to block the traffic.
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ip netns exec "${NS1}" sysctl -qw net.ipv4.conf.all.rp_filter=0
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ip netns exec "${NS2}" sysctl -qw net.ipv4.conf.all.rp_filter=0
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ip netns exec "${NS1}" sysctl -qw net.ipv4.conf.default.rp_filter=0
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ip netns exec "${NS2}" sysctl -qw net.ipv4.conf.default.rp_filter=0
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}
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setup_overlay_ipv6()
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{
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# Add the overlay IP addresses and route them through the veth devices
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ip -netns "${NS0}" address add 2001:db8::100/128 dev lo
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ip -netns "${NS3}" address add 2001:db8::103/128 dev lo
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ip -netns "${NS0}" route add 2001:db8::103/128 src 2001:db8::100 via 2001:db8::11
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ip -netns "${NS3}" route add 2001:db8::100/128 src 2001:db8::103 via 2001:db8::32
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# Route the overlay addresses in the intermediate namespaces
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# (used after bareudp decapsulation)
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ip netns exec "${NS1}" sysctl -qw net.ipv6.conf.all.forwarding=1
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ip netns exec "${NS2}" sysctl -qw net.ipv6.conf.all.forwarding=1
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ip -netns "${NS1}" route add 2001:db8::100/128 via 2001:db8::10
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ip -netns "${NS2}" route add 2001:db8::103/128 via 2001:db8::33
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}
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setup_overlay_mpls()
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{
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# Add specific overlay IP addresses, routed over MPLS
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ip -netns "${NS0}" address add 2001:db8::200/128 dev lo
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ip -netns "${NS3}" address add 2001:db8::203/128 dev lo
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ip -netns "${NS0}" route add 2001:db8::203/128 src 2001:db8::200 encap mpls 203 via 2001:db8::11
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ip -netns "${NS3}" route add 2001:db8::200/128 src 2001:db8::203 encap mpls 200 via 2001:db8::32
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# Route the MPLS packets in the intermediate namespaces
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# (used after bareudp decapsulation)
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ip netns exec "${NS1}" sysctl -qw net.mpls.platform_labels=256
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ip netns exec "${NS2}" sysctl -qw net.mpls.platform_labels=256
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ip -netns "${NS1}" -family mpls route add 200 via inet6 2001:db8::10
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ip -netns "${NS2}" -family mpls route add 203 via inet6 2001:db8::33
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}
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# Run "ping" from NS0 and print the result
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#
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# Parameters:
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#
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# * $1: the variant of ping to use (normally either "ping" or "ping6"),
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# * $2: the IP address to ping,
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# * $3: a human readable description of the purpose of the test.
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#
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# If the test fails and PAUSE_ON_FAIL is active, the user is given the
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# possibility to continue with the next test or to quit immediately.
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#
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ping_test_one()
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{
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local PING="$1"; readonly PING
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local IP="$2"; readonly IP
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local MSG="$3"; readonly MSG
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local RET
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printf "TEST: %-60s " "${MSG}"
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set +e
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ip netns exec "${NS0}" "${PING}" -w 5 -c 1 "${IP}" > /dev/null 2>&1
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RET=$?
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set -e
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if [ "${RET}" -eq 0 ]; then
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printf "[ OK ]\n"
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else
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ERR=1
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printf "[FAIL]\n"
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if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
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printf "\nHit enter to continue, 'q' to quit\n"
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read a
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if [ "$a" = "q" ]; then
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exit 1
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fi
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fi
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fi
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}
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# Run reachability tests
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#
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# Parameters:
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#
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# * $1: human readable string describing the underlay protocol.
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#
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# $IPV4, $IPV6, $MPLS_UC and $MULTIPROTO are inherited from the calling
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# function.
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#
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ping_test()
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{
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local UNDERLAY="$1"; readonly UNDERLAY
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local MODE
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local MSG
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if [ "${MULTIPROTO}" = "multiproto" ]; then
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MODE=" (multiproto mode)"
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else
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MODE=""
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fi
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if [ $IPV4 ]; then
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ping_test_one "ping" "192.0.2.103" "IPv4 packets over ${UNDERLAY}${MODE}"
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fi
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if [ $IPV6 ]; then
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ping_test_one "${PING6}" "2001:db8::103" "IPv6 packets over ${UNDERLAY}${MODE}"
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fi
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if [ $MPLS_UC ]; then
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ping_test_one "${PING6}" "2001:db8::203" "Unicast MPLS packets over ${UNDERLAY}${MODE}"
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fi
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}
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# Set up a bareudp overlay and run reachability tests over IPv4 and IPv6
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#
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# Parameters:
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#
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# * $1: the packet type (protocol) to be handled by bareudp,
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# * $2: a flag to activate or deactivate bareudp's "multiproto" mode.
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#
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test_overlay()
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{
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local ETHERTYPE="$1"; readonly ETHERTYPE
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local MULTIPROTO="$2"; readonly MULTIPROTO
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local IPV4
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local IPV6
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local MPLS_UC
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case "${ETHERTYPE}" in
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"ipv4")
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IPV4="ipv4"
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if [ "${MULTIPROTO}" = "multiproto" ]; then
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IPV6="ipv6"
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else
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IPV6=""
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fi
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MPLS_UC=""
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;;
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"ipv6")
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IPV6="ipv6"
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IPV4=""
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MPLS_UC=""
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;;
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"mpls_uc")
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MPLS_UC="mpls_uc"
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IPV4=""
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IPV6=""
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;;
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*)
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exit 1
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;;
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esac
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readonly IPV4
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readonly IPV6
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readonly MPLS_UC
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# Create the bareudp devices in the intermediate namespaces
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ip -netns "${NS1}" link add name bareudp_ns1 up type bareudp dstport 6635 ethertype "${ETHERTYPE}" "${MULTIPROTO}"
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ip -netns "${NS2}" link add name bareudp_ns2 up type bareudp dstport 6635 ethertype "${ETHERTYPE}" "${MULTIPROTO}"
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# IPv4 over UDPv4
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if [ $IPV4 ]; then
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# Encapsulation instructions for bareudp over IPv4
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tc -netns "${NS1}" filter add dev veth10 ingress protocol ipv4 \
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flower dst_ip 192.0.2.103/32 \
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action tunnel_key set src_ip 192.0.2.21 dst_ip 192.0.2.22 id 0 \
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action mirred egress redirect dev bareudp_ns1
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tc -netns "${NS2}" filter add dev veth23 ingress protocol ipv4 \
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flower dst_ip 192.0.2.100/32 \
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action tunnel_key set src_ip 192.0.2.22 dst_ip 192.0.2.21 id 0 \
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action mirred egress redirect dev bareudp_ns2
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fi
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# IPv6 over UDPv4
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if [ $IPV6 ]; then
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# Encapsulation instructions for bareudp over IPv4
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tc -netns "${NS1}" filter add dev veth10 ingress protocol ipv6 \
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flower dst_ip 2001:db8::103/128 \
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action tunnel_key set src_ip 192.0.2.21 dst_ip 192.0.2.22 id 0 \
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action mirred egress redirect dev bareudp_ns1
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tc -netns "${NS2}" filter add dev veth23 ingress protocol ipv6 \
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flower dst_ip 2001:db8::100/128 \
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action tunnel_key set src_ip 192.0.2.22 dst_ip 192.0.2.21 id 0 \
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action mirred egress redirect dev bareudp_ns2
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fi
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# 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
|