#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# redirect test
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#
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# .253 +----+
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# +----| r1 |
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# | +----+
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# +----+ | |.1
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# | h1 |--------------+ | 10.1.1.0/30 2001:db8:1::0/126
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# +----+ .1 | |.2
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# 172.16.1/24 | +----+ +----+
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# 2001:db8:16:1/64 +----| r2 |-------------------| h2 |
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# .254 +----+ .254 .2 +----+
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# 172.16.2/24
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# 2001:db8:16:2/64
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#
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# Route from h1 to h2 goes through r1, eth1 - connection between r1 and r2.
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# Route on r1 changed to go to r2 via eth0. This causes a redirect to be sent
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# from r1 to h1 telling h1 to use r2 when talking to h2.
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VERBOSE=0
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PAUSE_ON_FAIL=no
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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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R1_R2_N1_IP=10.1.1.1
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R2_R1_N1_IP=10.1.1.2
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R1_R2_N1_IP6=2001:db8:1::1
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R2_R1_N1_IP6=2001:db8:1::2
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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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R2_N2_IP=172.16.2.254
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H2_N2_IP6=2001:db8:16:2::2
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R2_N2_IP6=2001:db8:16:2::254
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VRF=red
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VRF_TABLE=1111
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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 a
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[ "$a" = "q" ] && exit 1
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fi
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fi
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}
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log_debug()
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{
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if [ "$VERBOSE" = "1" ]; then
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echo "$*"
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fi
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}
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run_cmd()
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{
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local cmd="$*"
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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: $cmd"
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fi
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out=$(eval $cmd 2>&1)
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rc=$?
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if [ "$VERBOSE" = "1" -a -n "$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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get_linklocal()
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{
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local ns=$1
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local dev=$2
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local addr
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addr=$(ip -netns $ns -6 -br addr show dev ${dev} | \
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awk '{
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for (i = 3; i <= NF; ++i) {
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if ($i ~ /^fe80/)
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print $i
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}
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}'
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)
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addr=${addr/\/*}
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[ -z "$addr" ] && return 1
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echo $addr
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return 0
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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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create_vrf()
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{
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local ns=$1
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ip -netns ${ns} link add ${VRF} type vrf table ${VRF_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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ip -netns ${ns} ru del pref 0
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ip -netns ${ns} ru add pref 32765 from all lookup local
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ip -netns ${ns} -6 ru del pref 0
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ip -netns ${ns} -6 ru add pref 32765 from all lookup local
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}
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setup()
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{
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local ns
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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 $ns li set lo up
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case "${ns}" in
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h[12]) ip netns exec $ns sysctl -q -w net.ipv4.conf.all.accept_redirects=1
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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.accept_redirects=1
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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.ipv4.conf.all.send_redirects=1
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ip netns exec $ns sysctl -q -w net.ipv4.conf.default.rp_filter=0
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ip netns exec $ns sysctl -q -w net.ipv4.conf.all.rp_filter=0
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ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=1
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ip netns exec $ns sysctl -q -w net.ipv6.route.mtu_expires=10
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esac
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done
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#
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# create interconnects
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#
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ip -netns h1 li add eth0 type veth peer name r1h1
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ip -netns h1 li set r1h1 netns r1 name eth0 up
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ip -netns h1 li add eth1 type veth peer name r2h1
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ip -netns h1 li set r2h1 netns r2 name eth0 up
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ip -netns h2 li add eth0 type veth peer name r2h2
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ip -netns h2 li set eth0 up
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ip -netns h2 li set r2h2 netns r2 name eth2 up
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ip -netns r1 li add eth1 type veth peer name r2r1
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ip -netns r1 li set eth1 up
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ip -netns r1 li set r2r1 netns r2 name eth1 up
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#
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# h1
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#
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if [ "${WITH_VRF}" = "yes" ]; then
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create_vrf "h1"
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H1_VRF_ARG="vrf ${VRF}"
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H1_PING_ARG="-I ${VRF}"
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else
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H1_VRF_ARG=
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H1_PING_ARG=
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fi
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ip -netns h1 li add br0 type bridge
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if [ "${WITH_VRF}" = "yes" ]; then
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ip -netns h1 li set br0 vrf ${VRF} up
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else
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ip -netns h1 li set br0 up
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fi
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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 li set eth0 master br0 up
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ip -netns h1 li set eth1 master br0 up
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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 ro add default via ${R2_N2_IP} dev eth0
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ip -netns h2 -6 addr add dev eth0 ${H2_N2_IP6}/64 nodad
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ip -netns h2 -6 ro add default via ${R2_N2_IP6} dev eth0
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#
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# r1
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#
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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_R2_N1_IP}/30
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ip -netns r1 -6 addr add dev eth1 ${R1_R2_N1_IP6}/126 nodad
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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_R1_N1_IP}/30
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ip -netns r2 -6 addr add dev eth1 ${R2_R1_N1_IP6}/126 nodad
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ip -netns r2 addr add dev eth2 ${R2_N2_IP}/24
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ip -netns r2 -6 addr add dev eth2 ${R2_N2_IP6}/64 nodad
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sleep 2
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R1_LLADDR=$(get_linklocal r1 eth0)
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if [ $? -ne 0 ]; then
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echo "Error: Failed to get link-local address of r1's eth0"
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exit 1
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fi
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log_debug "initial gateway is R1's lladdr = ${R1_LLADDR}"
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R2_LLADDR=$(get_linklocal r2 eth0)
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if [ $? -ne 0 ]; then
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echo "Error: Failed to get link-local address of r2's eth0"
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exit 1
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fi
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log_debug "initial gateway is R2's lladdr = ${R2_LLADDR}"
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}
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change_h2_mtu()
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{
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local mtu=$1
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run_cmd ip -netns h2 li set eth0 mtu ${mtu}
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run_cmd ip -netns r2 li set eth2 mtu ${mtu}
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}
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check_exception()
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{
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local mtu="$1"
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local with_redirect="$2"
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local desc="$3"
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# From 172.16.1.101: icmp_seq=1 Redirect Host(New nexthop: 172.16.1.102)
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if [ "$VERBOSE" = "1" ]; then
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echo "Commands to check for exception:"
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run_cmd ip -netns h1 ro get ${H1_VRF_ARG} ${H2_N2_IP}
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run_cmd ip -netns h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6}
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fi
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if [ -n "${mtu}" ]; then
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mtu=" mtu ${mtu}"
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fi
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if [ "$with_redirect" = "yes" ]; then
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ip -netns h1 ro get ${H1_VRF_ARG} ${H2_N2_IP} | \
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grep -q "cache <redirected> expires [0-9]*sec${mtu}"
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elif [ -n "${mtu}" ]; then
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ip -netns h1 ro get ${H1_VRF_ARG} ${H2_N2_IP} | \
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grep -q "cache expires [0-9]*sec${mtu}"
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else
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# want to verify that neither mtu nor redirected appears in
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# the route get output. The -v will wipe out the cache line
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# if either are set so the last grep -q will not find a match
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ip -netns h1 ro get ${H1_VRF_ARG} ${H2_N2_IP} | \
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grep -E -v 'mtu|redirected' | grep -q "cache"
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fi
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log_test $? 0 "IPv4: ${desc}"
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# No PMTU info for test "redirect" and "mtu exception plus redirect"
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if [ "$with_redirect" = "yes" ] && [ "$desc" != "redirect exception plus mtu" ]; then
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ip -netns h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} | \
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grep -v "mtu" | grep -q "${H2_N2_IP6} .*via ${R2_LLADDR} dev br0"
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elif [ -n "${mtu}" ]; then
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ip -netns h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} | \
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grep -q "${mtu}"
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else
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# IPv6 is a bit harder. First strip out the match if it
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# contains an mtu exception and then look for the first
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# gateway - R1's lladdr
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ip -netns h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} | \
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grep -v "mtu" | grep -q "${R1_LLADDR}"
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fi
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log_test $? 0 "IPv6: ${desc}"
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}
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run_ping()
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{
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local sz=$1
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run_cmd ip netns exec h1 ping -q -M want -i 0.5 -c 10 -w 2 -s ${sz} ${H1_PING_ARG} ${H2_N2_IP}
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run_cmd ip netns exec h1 ${ping6} -q -M want -i 0.5 -c 10 -w 2 -s ${sz} ${H1_PING_ARG} ${H2_N2_IP6}
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}
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replace_route_new()
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{
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# r1 to h2 via r2 and eth0
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run_cmd ip -netns r1 nexthop replace id 1 via ${R2_N1_IP} dev eth0
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run_cmd ip -netns r1 nexthop replace id 2 via ${R2_LLADDR} dev eth0
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}
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reset_route_new()
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{
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run_cmd ip -netns r1 nexthop flush
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run_cmd ip -netns h1 nexthop flush
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initial_route_new
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}
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initial_route_new()
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{
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# r1 to h2 via r2 and eth1
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run_cmd ip -netns r1 nexthop add id 1 via ${R2_R1_N1_IP} dev eth1
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run_cmd ip -netns r1 ro add ${H2_N2} nhid 1
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run_cmd ip -netns r1 nexthop add id 2 via ${R2_R1_N1_IP6} dev eth1
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run_cmd ip -netns r1 -6 ro add ${H2_N2_6} nhid 2
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# h1 to h2 via r1
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run_cmd ip -netns h1 nexthop add id 1 via ${R1_N1_IP} dev br0
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run_cmd ip -netns h1 ro add ${H1_VRF_ARG} ${H2_N2} nhid 1
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run_cmd ip -netns h1 nexthop add id 2 via ${R1_LLADDR} dev br0
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run_cmd ip -netns h1 -6 ro add ${H1_VRF_ARG} ${H2_N2_6} nhid 2
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}
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replace_route_legacy()
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{
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# r1 to h2 via r2 and eth0
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run_cmd ip -netns r1 ro replace ${H2_N2} via ${R2_N1_IP} dev eth0
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run_cmd ip -netns r1 -6 ro replace ${H2_N2_6} via ${R2_LLADDR} dev eth0
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}
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reset_route_legacy()
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{
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run_cmd ip -netns r1 ro del ${H2_N2}
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run_cmd ip -netns r1 -6 ro del ${H2_N2_6}
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run_cmd ip -netns h1 ro del ${H1_VRF_ARG} ${H2_N2}
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run_cmd ip -netns h1 -6 ro del ${H1_VRF_ARG} ${H2_N2_6}
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initial_route_legacy
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}
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initial_route_legacy()
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{
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# r1 to h2 via r2 and eth1
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run_cmd ip -netns r1 ro add ${H2_N2} via ${R2_R1_N1_IP} dev eth1
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run_cmd ip -netns r1 -6 ro add ${H2_N2_6} via ${R2_R1_N1_IP6} dev eth1
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# h1 to h2 via r1
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# - IPv6 redirect only works if gateway is the LLA
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run_cmd ip -netns h1 ro add ${H1_VRF_ARG} ${H2_N2} via ${R1_N1_IP} dev br0
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run_cmd ip -netns h1 -6 ro add ${H1_VRF_ARG} ${H2_N2_6} via ${R1_LLADDR} dev br0
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}
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check_connectivity()
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{
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local rc
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run_cmd ip netns exec h1 ping -c1 -w1 ${H1_PING_ARG} ${H2_N2_IP}
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rc=$?
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run_cmd ip netns exec h1 ${ping6} -c1 -w1 ${H1_PING_ARG} ${H2_N2_IP6}
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[ $? -ne 0 ] && rc=$?
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return $rc
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}
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do_test()
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{
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local ttype="$1"
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eval initial_route_${ttype}
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# verify connectivity
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check_connectivity
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if [ $? -ne 0 ]; then
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echo "Error: Basic connectivity is broken"
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ret=1
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return
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fi
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# redirect exception followed by mtu
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eval replace_route_${ttype}
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run_ping 64
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check_exception "" "yes" "redirect exception"
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check_connectivity
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if [ $? -ne 0 ]; then
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echo "Error: Basic connectivity is broken after redirect"
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ret=1
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return
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fi
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change_h2_mtu 1300
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run_ping 1350
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check_exception "1300" "yes" "redirect exception plus mtu"
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# remove exceptions and restore routing
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change_h2_mtu 1500
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eval reset_route_${ttype}
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check_connectivity
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if [ $? -ne 0 ]; then
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echo "Error: Basic connectivity is broken after reset"
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ret=1
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return
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fi
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check_exception "" "no" "routing reset"
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# MTU exception followed by redirect
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change_h2_mtu 1300
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run_ping 1350
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check_exception "1300" "no" "mtu exception"
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eval replace_route_${ttype}
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run_ping 64
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check_exception "1300" "yes" "mtu exception plus redirect"
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check_connectivity
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if [ $? -ne 0 ]; then
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echo "Error: Basic connectivity is broken after redirect"
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ret=1
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return
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fi
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}
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################################################################################
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# usage
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usage()
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{
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cat <<EOF
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usage: ${0##*/} OPTS
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-p Pause on fail
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-v verbose mode (show commands and output)
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EOF
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}
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################################################################################
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# main
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# Some systems don't have a ping6 binary anymore
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which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping)
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ret=0
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nsuccess=0
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nfail=0
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while getopts :pv o
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do
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case $o in
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p) PAUSE_ON_FAIL=yes;;
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v) VERBOSE=$(($VERBOSE + 1));;
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*) usage; exit 1;;
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esac
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done
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trap cleanup EXIT
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cleanup
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WITH_VRF=no
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setup
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log_section "Legacy routing"
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do_test "legacy"
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cleanup
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log_section "Legacy routing with VRF"
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WITH_VRF=yes
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setup
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do_test "legacy"
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cleanup
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log_section "Routing with nexthop objects"
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ip nexthop ls >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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WITH_VRF=no
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setup
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do_test "new"
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cleanup
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log_section "Routing with nexthop objects and VRF"
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WITH_VRF=yes
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setup
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do_test "new"
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else
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echo "Nexthop objects not supported; skipping tests"
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fi
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printf "\nTests passed: %3d\n" ${nsuccess}
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printf "Tests failed: %3d\n" ${nfail}
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exit $ret
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