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1a01727676
The objective of the tests is to check that ICMP errors generated while crossing between VRFs are properly routed back to the source host. The first ttl test sends a ping with a ttl of 1 from h1 to h2 and parses the output of the command to check that a ttl expired error is received. The second ttl test runs traceroute from h1 to h2 and parses the output to check for a hop on r1. The mtu test sends a ping with a payload of 1450 from h1 to h2, through r1 which has an interface with a mtu of 1400 and parses the output of the command to check that a fragmentation needed error is received. [ The IPv6 MTU test still fails with the symmetric routing setup. It appears to be caused by source address selection picking ::1. Fixing this is beyond the scope of this series. ] Signed-off-by: Michael Jeanson <mjeanson@efficios.com> Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
627 lines
14 KiB
Bash
Executable File
627 lines
14 KiB
Bash
Executable File
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# Copyright (c) 2019 David Ahern <dsahern@gmail.com>. All rights reserved.
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# Copyright (c) 2020 Michael Jeanson <mjeanson@efficios.com>. All rights reserved.
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#
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# Requires CONFIG_NET_VRF, CONFIG_VETH, CONFIG_BRIDGE and CONFIG_NET_NS.
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#
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#
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# Symmetric routing topology
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#
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# blue red
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# +----+ .253 +----+ .253 +----+
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# | h1 |-------------------| r1 |-------------------| h2 |
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# +----+ .1 +----+ .2 +----+
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# 172.16.1/24 172.16.2/24
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# 2001:db8:16:1/64 2001:db8:16:2/64
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#
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#
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# Route from h1 to h2 and back goes through r1, incoming vrf blue has a route
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# to the outgoing vrf red for the n2 network and red has a route back to n1.
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# The red VRF interface has a MTU of 1400.
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#
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# The first test sends a ping with a ttl of 1 from h1 to h2 and parses the
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# output of the command to check that a ttl expired error is received.
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#
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# The second test runs traceroute from h1 to h2 and parses the output to check
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# for a hop on r1.
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#
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# The third test sends a ping with a packet size of 1450 from h1 to h2 and
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# parses the output of the command to check that a fragmentation error is
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# received.
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#
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#
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# Asymmetric routing topology
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#
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# This topology represents a customer setup where the issue with icmp errors
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# and VRF route leaking was initialy reported. The MTU test isn't done here
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# because of the lack of a return route in the red VRF.
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#
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# blue red
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# .253 +----+ .253
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# +----| r1 |----+
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# | +----+ |
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# +----+ | | +----+
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# | h1 |--------------+ +--------------| h2 |
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# +----+ .1 | | .2 +----+
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# 172.16.1/24 | +----+ | 172.16.2/24
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# 2001:db8:16:1/64 +----| r2 |----+ 2001:db8:16:2/64
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# .254 +----+ .254
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#
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#
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# Route from h1 to h2 goes through r1, incoming vrf blue has a route to the
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# outgoing vrf red for the n2 network but red doesn't have a route back to n1.
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# Route from h2 to h1 goes through r2.
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#
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# The objective is to check that the incoming vrf routing table is selected
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# to send an ICMP error back to the source when the ttl of a packet reaches 1
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# while it is forwarded between different vrfs.
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VERBOSE=0
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PAUSE_ON_FAIL=no
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DEFAULT_TTYPE=sym
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H1_N1=172.16.1.0/24
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H1_N1_6=2001:db8:16:1::/64
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H1_N1_IP=172.16.1.1
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R1_N1_IP=172.16.1.253
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R2_N1_IP=172.16.1.254
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H1_N1_IP6=2001:db8:16:1::1
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R1_N1_IP6=2001:db8:16:1::253
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R2_N1_IP6=2001:db8:16:1::254
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H2_N2=172.16.2.0/24
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H2_N2_6=2001:db8:16:2::/64
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H2_N2_IP=172.16.2.2
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R1_N2_IP=172.16.2.253
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R2_N2_IP=172.16.2.254
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H2_N2_IP6=2001:db8:16:2::2
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R1_N2_IP6=2001:db8:16:2::253
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R2_N2_IP6=2001:db8:16:2::254
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################################################################################
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# helpers
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log_section()
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{
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echo
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echo "###########################################################################"
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echo "$*"
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echo "###########################################################################"
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echo
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}
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log_test()
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{
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local rc=$1
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local expected=$2
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local msg="$3"
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if [ "${rc}" -eq "${expected}" ]; then
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printf "TEST: %-60s [ OK ]\n" "${msg}"
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nsuccess=$((nsuccess+1))
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else
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ret=1
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nfail=$((nfail+1))
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printf "TEST: %-60s [FAIL]\n" "${msg}"
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if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
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echo
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echo "hit enter to continue, 'q' to quit"
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read -r a
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[ "$a" = "q" ] && exit 1
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fi
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fi
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}
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run_cmd()
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{
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local cmd="$*"
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local out
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local rc
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if [ "$VERBOSE" = "1" ]; then
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echo "COMMAND: $cmd"
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fi
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# shellcheck disable=SC2086
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out=$(eval $cmd 2>&1)
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rc=$?
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if [ "$VERBOSE" = "1" ] && [ -n "$out" ]; then
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echo "$out"
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fi
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[ "$VERBOSE" = "1" ] && echo
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return $rc
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}
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run_cmd_grep()
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{
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local grep_pattern="$1"
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shift
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local cmd="$*"
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local out
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local rc
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if [ "$VERBOSE" = "1" ]; then
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echo "COMMAND: $cmd"
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fi
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# shellcheck disable=SC2086
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out=$(eval $cmd 2>&1)
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if [ "$VERBOSE" = "1" ] && [ -n "$out" ]; then
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echo "$out"
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fi
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echo "$out" | grep -q "$grep_pattern"
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rc=$?
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[ "$VERBOSE" = "1" ] && echo
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return $rc
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}
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################################################################################
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# setup and teardown
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cleanup()
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{
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local ns
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for ns in h1 h2 r1 r2; do
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ip netns del $ns 2>/dev/null
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done
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}
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setup_vrf()
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{
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local ns=$1
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ip -netns "${ns}" rule del pref 0
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ip -netns "${ns}" rule add pref 32765 from all lookup local
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ip -netns "${ns}" -6 rule del pref 0
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ip -netns "${ns}" -6 rule add pref 32765 from all lookup local
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}
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create_vrf()
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{
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local ns=$1
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local vrf=$2
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local table=$3
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ip -netns "${ns}" link add "${vrf}" type vrf table "${table}"
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ip -netns "${ns}" link set "${vrf}" up
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ip -netns "${ns}" route add vrf "${vrf}" unreachable default metric 8192
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ip -netns "${ns}" -6 route add vrf "${vrf}" unreachable default metric 8192
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ip -netns "${ns}" addr add 127.0.0.1/8 dev "${vrf}"
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ip -netns "${ns}" -6 addr add ::1 dev "${vrf}" nodad
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}
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setup_sym()
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{
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local ns
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# make sure we are starting with a clean slate
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cleanup
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#
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# create nodes as namespaces
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#
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for ns in h1 h2 r1; do
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ip netns add $ns
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ip -netns $ns link set lo up
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case "${ns}" in
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h[12]) ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=0
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ip netns exec $ns sysctl -q -w net.ipv6.conf.all.keep_addr_on_down=1
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;;
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r1) ip netns exec $ns sysctl -q -w net.ipv4.ip_forward=1
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ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=1
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esac
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done
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#
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# create interconnects
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#
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ip -netns h1 link add eth0 type veth peer name r1h1
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ip -netns h1 link set r1h1 netns r1 name eth0 up
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ip -netns h2 link add eth0 type veth peer name r1h2
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ip -netns h2 link set r1h2 netns r1 name eth1 up
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#
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# h1
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#
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ip -netns h1 addr add dev eth0 ${H1_N1_IP}/24
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ip -netns h1 -6 addr add dev eth0 ${H1_N1_IP6}/64 nodad
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ip -netns h1 link set eth0 up
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# h1 to h2 via r1
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ip -netns h1 route add ${H2_N2} via ${R1_N1_IP} dev eth0
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ip -netns h1 -6 route add ${H2_N2_6} via "${R1_N1_IP6}" dev eth0
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#
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# h2
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#
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ip -netns h2 addr add dev eth0 ${H2_N2_IP}/24
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ip -netns h2 -6 addr add dev eth0 ${H2_N2_IP6}/64 nodad
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ip -netns h2 link set eth0 up
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# h2 to h1 via r1
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ip -netns h2 route add default via ${R1_N2_IP} dev eth0
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ip -netns h2 -6 route add default via ${R1_N2_IP6} dev eth0
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#
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# r1
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#
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setup_vrf r1
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create_vrf r1 blue 1101
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create_vrf r1 red 1102
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ip -netns r1 link set mtu 1400 dev eth1
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ip -netns r1 link set eth0 vrf blue up
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ip -netns r1 link set eth1 vrf red up
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ip -netns r1 addr add dev eth0 ${R1_N1_IP}/24
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ip -netns r1 -6 addr add dev eth0 ${R1_N1_IP6}/64 nodad
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ip -netns r1 addr add dev eth1 ${R1_N2_IP}/24
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ip -netns r1 -6 addr add dev eth1 ${R1_N2_IP6}/64 nodad
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# Route leak from blue to red
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ip -netns r1 route add vrf blue ${H2_N2} dev red
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ip -netns r1 -6 route add vrf blue ${H2_N2_6} dev red
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# Route leak from red to blue
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ip -netns r1 route add vrf red ${H1_N1} dev blue
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ip -netns r1 -6 route add vrf red ${H1_N1_6} dev blue
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# Wait for ip config to settle
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sleep 2
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}
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setup_asym()
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{
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local ns
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# make sure we are starting with a clean slate
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cleanup
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#
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# create nodes as namespaces
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#
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for ns in h1 h2 r1 r2; do
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ip netns add $ns
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ip -netns $ns link set lo up
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case "${ns}" in
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h[12]) ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=0
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ip netns exec $ns sysctl -q -w net.ipv6.conf.all.keep_addr_on_down=1
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;;
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r[12]) ip netns exec $ns sysctl -q -w net.ipv4.ip_forward=1
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ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=1
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esac
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done
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#
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# create interconnects
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#
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ip -netns h1 link add eth0 type veth peer name r1h1
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ip -netns h1 link set r1h1 netns r1 name eth0 up
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ip -netns h1 link add eth1 type veth peer name r2h1
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ip -netns h1 link set r2h1 netns r2 name eth0 up
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ip -netns h2 link add eth0 type veth peer name r1h2
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ip -netns h2 link set r1h2 netns r1 name eth1 up
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ip -netns h2 link add eth1 type veth peer name r2h2
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ip -netns h2 link set r2h2 netns r2 name eth1 up
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#
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# h1
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#
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ip -netns h1 link add br0 type bridge
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ip -netns h1 link set br0 up
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ip -netns h1 addr add dev br0 ${H1_N1_IP}/24
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ip -netns h1 -6 addr add dev br0 ${H1_N1_IP6}/64 nodad
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ip -netns h1 link set eth0 master br0 up
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ip -netns h1 link set eth1 master br0 up
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# h1 to h2 via r1
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ip -netns h1 route add ${H2_N2} via ${R1_N1_IP} dev br0
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ip -netns h1 -6 route add ${H2_N2_6} via "${R1_N1_IP6}" dev br0
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#
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# h2
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#
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ip -netns h2 link add br0 type bridge
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ip -netns h2 link set br0 up
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ip -netns h2 addr add dev br0 ${H2_N2_IP}/24
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ip -netns h2 -6 addr add dev br0 ${H2_N2_IP6}/64 nodad
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ip -netns h2 link set eth0 master br0 up
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ip -netns h2 link set eth1 master br0 up
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# h2 to h1 via r2
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ip -netns h2 route add default via ${R2_N2_IP} dev br0
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ip -netns h2 -6 route add default via ${R2_N2_IP6} dev br0
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#
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# r1
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#
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setup_vrf r1
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create_vrf r1 blue 1101
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create_vrf r1 red 1102
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ip -netns r1 link set mtu 1400 dev eth1
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ip -netns r1 link set eth0 vrf blue up
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ip -netns r1 link set eth1 vrf red up
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ip -netns r1 addr add dev eth0 ${R1_N1_IP}/24
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ip -netns r1 -6 addr add dev eth0 ${R1_N1_IP6}/64 nodad
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ip -netns r1 addr add dev eth1 ${R1_N2_IP}/24
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ip -netns r1 -6 addr add dev eth1 ${R1_N2_IP6}/64 nodad
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# Route leak from blue to red
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ip -netns r1 route add vrf blue ${H2_N2} dev red
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ip -netns r1 -6 route add vrf blue ${H2_N2_6} dev red
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# No route leak from red to blue
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#
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# r2
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#
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ip -netns r2 addr add dev eth0 ${R2_N1_IP}/24
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ip -netns r2 -6 addr add dev eth0 ${R2_N1_IP6}/64 nodad
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ip -netns r2 addr add dev eth1 ${R2_N2_IP}/24
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ip -netns r2 -6 addr add dev eth1 ${R2_N2_IP6}/64 nodad
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# Wait for ip config to settle
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sleep 2
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}
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check_connectivity()
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{
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ip netns exec h1 ping -c1 -w1 ${H2_N2_IP} >/dev/null 2>&1
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log_test $? 0 "Basic IPv4 connectivity"
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return $?
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}
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check_connectivity6()
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{
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ip netns exec h1 "${ping6}" -c1 -w1 ${H2_N2_IP6} >/dev/null 2>&1
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log_test $? 0 "Basic IPv6 connectivity"
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return $?
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}
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check_traceroute()
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{
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if [ ! -x "$(command -v traceroute)" ]; then
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echo "SKIP: Could not run IPV4 test without traceroute"
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return 1
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fi
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}
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check_traceroute6()
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{
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if [ ! -x "$(command -v traceroute6)" ]; then
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echo "SKIP: Could not run IPV6 test without traceroute6"
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return 1
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fi
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}
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ipv4_traceroute()
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{
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local ttype="$1"
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[ "x$ttype" = "x" ] && ttype="$DEFAULT_TTYPE"
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log_section "IPv4 ($ttype route): VRF ICMP error route lookup traceroute"
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check_traceroute || return
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setup_"$ttype"
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check_connectivity || return
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run_cmd_grep "${R1_N1_IP}" ip netns exec h1 traceroute ${H2_N2_IP}
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log_test $? 0 "Traceroute reports a hop on r1"
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}
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ipv4_traceroute_asym()
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{
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ipv4_traceroute asym
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}
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ipv6_traceroute()
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{
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local ttype="$1"
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[ "x$ttype" = "x" ] && ttype="$DEFAULT_TTYPE"
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log_section "IPv6 ($ttype route): VRF ICMP error route lookup traceroute"
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check_traceroute6 || return
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setup_"$ttype"
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check_connectivity6 || return
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run_cmd_grep "${R1_N1_IP6}" ip netns exec h1 traceroute6 ${H2_N2_IP6}
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log_test $? 0 "Traceroute6 reports a hop on r1"
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}
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ipv6_traceroute_asym()
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{
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ipv6_traceroute asym
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}
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ipv4_ping_ttl()
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{
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local ttype="$1"
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[ "x$ttype" = "x" ] && ttype="$DEFAULT_TTYPE"
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log_section "IPv4 ($ttype route): VRF ICMP ttl error route lookup ping"
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setup_"$ttype"
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check_connectivity || return
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run_cmd_grep "Time to live exceeded" ip netns exec h1 ping -t1 -c1 -W2 ${H2_N2_IP}
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log_test $? 0 "Ping received ICMP ttl exceeded"
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}
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ipv4_ping_ttl_asym()
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{
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ipv4_ping_ttl asym
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}
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ipv4_ping_frag()
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{
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local ttype="$1"
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[ "x$ttype" = "x" ] && ttype="$DEFAULT_TTYPE"
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log_section "IPv4 ($ttype route): VRF ICMP fragmentation error route lookup ping"
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setup_"$ttype"
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check_connectivity || return
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run_cmd_grep "Frag needed" ip netns exec h1 ping -s 1450 -Mdo -c1 -W2 ${H2_N2_IP}
|
|
log_test $? 0 "Ping received ICMP Frag needed"
|
|
}
|
|
|
|
ipv4_ping_frag_asym()
|
|
{
|
|
ipv4_ping_frag asym
|
|
}
|
|
|
|
ipv6_ping_ttl()
|
|
{
|
|
local ttype="$1"
|
|
|
|
[ "x$ttype" = "x" ] && ttype="$DEFAULT_TTYPE"
|
|
|
|
log_section "IPv6 ($ttype route): VRF ICMP ttl error route lookup ping"
|
|
|
|
setup_"$ttype"
|
|
|
|
check_connectivity6 || return
|
|
|
|
run_cmd_grep "Time exceeded: Hop limit" ip netns exec h1 "${ping6}" -t1 -c1 -W2 ${H2_N2_IP6}
|
|
log_test $? 0 "Ping received ICMP Hop limit"
|
|
}
|
|
|
|
ipv6_ping_ttl_asym()
|
|
{
|
|
ipv6_ping_ttl asym
|
|
}
|
|
|
|
ipv6_ping_frag()
|
|
{
|
|
local ttype="$1"
|
|
|
|
[ "x$ttype" = "x" ] && ttype="$DEFAULT_TTYPE"
|
|
|
|
log_section "IPv6 ($ttype route): VRF ICMP fragmentation error route lookup ping"
|
|
|
|
setup_"$ttype"
|
|
|
|
check_connectivity6 || return
|
|
|
|
run_cmd_grep "Packet too big" ip netns exec h1 "${ping6}" -s 1450 -Mdo -c1 -W2 ${H2_N2_IP6}
|
|
log_test $? 0 "Ping received ICMP Packet too big"
|
|
}
|
|
|
|
ipv6_ping_frag_asym()
|
|
{
|
|
ipv6_ping_frag asym
|
|
}
|
|
|
|
################################################################################
|
|
# usage
|
|
|
|
usage()
|
|
{
|
|
cat <<EOF
|
|
usage: ${0##*/} OPTS
|
|
|
|
-4 Run IPv4 tests only
|
|
-6 Run IPv6 tests only
|
|
-t TEST Run only TEST
|
|
-p Pause on fail
|
|
-v verbose mode (show commands and output)
|
|
EOF
|
|
}
|
|
|
|
################################################################################
|
|
# main
|
|
|
|
# Some systems don't have a ping6 binary anymore
|
|
command -v ping6 > /dev/null 2>&1 && ping6=$(command -v ping6) || ping6=$(command -v ping)
|
|
|
|
TESTS_IPV4="ipv4_ping_ttl ipv4_traceroute ipv4_ping_frag ipv4_ping_ttl_asym ipv4_traceroute_asym"
|
|
TESTS_IPV6="ipv6_ping_ttl ipv6_traceroute ipv6_ping_frag ipv6_ping_ttl_asym ipv6_traceroute_asym"
|
|
|
|
ret=0
|
|
nsuccess=0
|
|
nfail=0
|
|
|
|
while getopts :46t:pvh o
|
|
do
|
|
case $o in
|
|
4) TESTS=ipv4;;
|
|
6) TESTS=ipv6;;
|
|
t) TESTS=$OPTARG;;
|
|
p) PAUSE_ON_FAIL=yes;;
|
|
v) VERBOSE=1;;
|
|
h) usage; exit 0;;
|
|
*) usage; exit 1;;
|
|
esac
|
|
done
|
|
|
|
#
|
|
# show user test config
|
|
#
|
|
if [ -z "$TESTS" ]; then
|
|
TESTS="$TESTS_IPV4 $TESTS_IPV6"
|
|
elif [ "$TESTS" = "ipv4" ]; then
|
|
TESTS="$TESTS_IPV4"
|
|
elif [ "$TESTS" = "ipv6" ]; then
|
|
TESTS="$TESTS_IPV6"
|
|
fi
|
|
|
|
for t in $TESTS
|
|
do
|
|
case $t in
|
|
ipv4_ping_ttl|ping) ipv4_ping_ttl;;&
|
|
ipv4_ping_ttl_asym|ping) ipv4_ping_ttl_asym;;&
|
|
ipv4_traceroute|traceroute) ipv4_traceroute;;&
|
|
ipv4_traceroute_asym|traceroute) ipv4_traceroute_asym;;&
|
|
ipv4_ping_frag|ping) ipv4_ping_frag;;&
|
|
|
|
ipv6_ping_ttl|ping) ipv6_ping_ttl;;&
|
|
ipv6_ping_ttl_asym|ping) ipv6_ping_ttl_asym;;&
|
|
ipv6_traceroute|traceroute) ipv6_traceroute;;&
|
|
ipv6_traceroute_asym|traceroute) ipv6_traceroute_asym;;&
|
|
ipv6_ping_frag|ping) ipv6_ping_frag;;&
|
|
|
|
# setup namespaces and config, but do not run any tests
|
|
setup_sym|setup) setup_sym; exit 0;;
|
|
setup_asym) setup_asym; exit 0;;
|
|
|
|
help) echo "Test names: $TESTS"; exit 0;;
|
|
esac
|
|
done
|
|
|
|
cleanup
|
|
|
|
printf "\nTests passed: %3d\n" ${nsuccess}
|
|
printf "Tests failed: %3d\n" ${nfail}
|
|
|
|
exit $ret
|