#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# redirect test
#
# .253 +----+
# +----| r1 |
# | +----+
# +----+ | |.1
# | h1 |--------------+ | 10.1.1.0/30 2001:db8:1::0/126
# +----+ .1 | |.2
# 172.16.1/24 | +----+ +----+
# 2001:db8:16:1/64 +----| r2 |-------------------| h2 |
# .254 +----+ .254 .2 +----+
# 172.16.2/24
# 2001:db8:16:2/64
#
# Route from h1 to h2 goes through r1, eth1 - connection between r1 and r2.
# Route on r1 changed to go to r2 via eth0. This causes a redirect to be sent
# from r1 to h1 telling h1 to use r2 when talking to h2.
source lib.sh
VERBOSE=0
PAUSE_ON_FAIL=no
H1_N1_IP=172.16.1.1
R1_N1_IP=172.16.1.253
R2_N1_IP=172.16.1.254
H1_N1_IP6=2001:db8:16:1::1
R1_N1_IP6=2001:db8:16:1::253
R2_N1_IP6=2001:db8:16:1::254
R1_R2_N1_IP=10.1.1.1
R2_R1_N1_IP=10.1.1.2
R1_R2_N1_IP6=2001:db8:1::1
R2_R1_N1_IP6=2001:db8:1::2
H2_N2=172.16.2.0/24
H2_N2_6=2001:db8:16:2::/64
H2_N2_IP=172.16.2.2
R2_N2_IP=172.16.2.254
H2_N2_IP6=2001:db8:16:2::2
R2_N2_IP6=2001:db8:16:2::254
VRF=red
VRF_TABLE=1111
################################################################################
# helpers
log_section()
{
echo
echo "###########################################################################"
echo "$*"
echo "###########################################################################"
echo
}
log_test()
{
local rc=$1
local expected=$2
local msg="$3"
local xfail=$4
if [ ${rc} -eq ${expected} ]; then
printf "TEST: %-60s [ OK ]\n" "${msg}"
nsuccess=$((nsuccess+1))
elif [ ${rc} -eq ${xfail} ]; then
printf "TEST: %-60s [XFAIL]\n" "${msg}"
nxfail=$((nxfail+1))
else
ret=1
nfail=$((nfail+1))
printf "TEST: %-60s [FAIL]\n" "${msg}"
if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
echo
echo "hit enter to continue, 'q' to quit"
read a
[ "$a" = "q" ] && exit 1
fi
fi
}
log_debug()
{
if [ "$VERBOSE" = "1" ]; then
echo "$*"
fi
}
run_cmd()
{
local cmd="$*"
local out
local rc
if [ "$VERBOSE" = "1" ]; then
echo "COMMAND: $cmd"
fi
out=$(eval $cmd 2>&1)
rc=$?
if [ "$VERBOSE" = "1" -a -n "$out" ]; then
echo "$out"
fi
[ "$VERBOSE" = "1" ] && echo
return $rc
}
get_linklocal()
{
local ns=$1
local dev=$2
local addr
addr=$(ip -netns $ns -6 -br addr show dev ${dev} | \
awk '{
for (i = 3; i <= NF; ++i) {
if ($i ~ /^fe80/)
print $i
}
}'
)
addr=${addr/\/*}
[ -z "$addr" ] && return 1
echo $addr
return 0
}
################################################################################
# setup and teardown
cleanup()
{
cleanup_ns $h1 $h2 $r1 $r2
}
create_vrf()
{
local ns=$1
ip -netns ${ns} link add ${VRF} type vrf table ${VRF_TABLE}
ip -netns ${ns} link set ${VRF} up
ip -netns ${ns} route add vrf ${VRF} unreachable default metric 8192
ip -netns ${ns} -6 route add vrf ${VRF} unreachable default metric 8192
ip -netns ${ns} addr add 127.0.0.1/8 dev ${VRF}
ip -netns ${ns} -6 addr add ::1 dev ${VRF} nodad
ip -netns ${ns} ru del pref 0
ip -netns ${ns} ru add pref 32765 from all lookup local
ip -netns ${ns} -6 ru del pref 0
ip -netns ${ns} -6 ru add pref 32765 from all lookup local
}
setup()
{
local ns
#
# create nodes as namespaces
setup_ns h1 h2 r1 r2
for ns in $h1 $h2 $r1 $r2; do
if echo $ns | grep -q h[12]-; then
ip netns exec $ns sysctl -q -w net.ipv4.conf.all.accept_redirects=1
ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=0
ip netns exec $ns sysctl -q -w net.ipv6.conf.all.accept_redirects=1
ip netns exec $ns sysctl -q -w net.ipv6.conf.all.keep_addr_on_down=1
else
ip netns exec $ns sysctl -q -w net.ipv4.ip_forward=1
ip netns exec $ns sysctl -q -w net.ipv4.conf.all.send_redirects=1
ip netns exec $ns sysctl -q -w net.ipv4.conf.default.rp_filter=0
ip netns exec $ns sysctl -q -w net.ipv4.conf.all.rp_filter=0
ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=1
ip netns exec $ns sysctl -q -w net.ipv6.route.mtu_expires=10
fi
done
#
# create interconnects
#
ip -netns $h1 li add eth0 type veth peer name r1h1
ip -netns $h1 li set r1h1 netns $r1 name eth0 up
ip -netns $h1 li add eth1 type veth peer name r2h1
ip -netns $h1 li set r2h1 netns $r2 name eth0 up
ip -netns $h2 li add eth0 type veth peer name r2h2
ip -netns $h2 li set eth0 up
ip -netns $h2 li set r2h2 netns $r2 name eth2 up
ip -netns $r1 li add eth1 type veth peer name r2r1
ip -netns $r1 li set eth1 up
ip -netns $r1 li set r2r1 netns $r2 name eth1 up
#
# h1
#
if [ "${WITH_VRF}" = "yes" ]; then
create_vrf "$h1"
H1_VRF_ARG="vrf ${VRF}"
H1_PING_ARG="-I ${VRF}"
else
H1_VRF_ARG=
H1_PING_ARG=
fi
ip -netns $h1 li add br0 type bridge
if [ "${WITH_VRF}" = "yes" ]; then
ip -netns $h1 li set br0 vrf ${VRF} up
else
ip -netns $h1 li set br0 up
fi
ip -netns $h1 addr add dev br0 ${H1_N1_IP}/24
ip -netns $h1 -6 addr add dev br0 ${H1_N1_IP6}/64 nodad
ip -netns $h1 li set eth0 master br0 up
ip -netns $h1 li set eth1 master br0 up
#
# h2
#
ip -netns $h2 addr add dev eth0 ${H2_N2_IP}/24
ip -netns $h2 ro add default via ${R2_N2_IP} dev eth0
ip -netns $h2 -6 addr add dev eth0 ${H2_N2_IP6}/64 nodad
ip -netns $h2 -6 ro add default via ${R2_N2_IP6} dev eth0
#
# r1
#
ip -netns $r1 addr add dev eth0 ${R1_N1_IP}/24
ip -netns $r1 -6 addr add dev eth0 ${R1_N1_IP6}/64 nodad
ip -netns $r1 addr add dev eth1 ${R1_R2_N1_IP}/30
ip -netns $r1 -6 addr add dev eth1 ${R1_R2_N1_IP6}/126 nodad
#
# r2
#
ip -netns $r2 addr add dev eth0 ${R2_N1_IP}/24
ip -netns $r2 -6 addr add dev eth0 ${R2_N1_IP6}/64 nodad
ip -netns $r2 addr add dev eth1 ${R2_R1_N1_IP}/30
ip -netns $r2 -6 addr add dev eth1 ${R2_R1_N1_IP6}/126 nodad
ip -netns $r2 addr add dev eth2 ${R2_N2_IP}/24
ip -netns $r2 -6 addr add dev eth2 ${R2_N2_IP6}/64 nodad
sleep 2
R1_LLADDR=$(get_linklocal $r1 eth0)
if [ $? -ne 0 ]; then
echo "Error: Failed to get link-local address of r1's eth0"
exit 1
fi
log_debug "initial gateway is R1's lladdr = ${R1_LLADDR}"
R2_LLADDR=$(get_linklocal $r2 eth0)
if [ $? -ne 0 ]; then
echo "Error: Failed to get link-local address of r2's eth0"
exit 1
fi
log_debug "initial gateway is R2's lladdr = ${R2_LLADDR}"
}
change_h2_mtu()
{
local mtu=$1
run_cmd ip -netns $h2 li set eth0 mtu ${mtu}
run_cmd ip -netns $r2 li set eth2 mtu ${mtu}
}
check_exception()
{
local mtu="$1"
local with_redirect="$2"
local desc="$3"
# From 172.16.1.101: icmp_seq=1 Redirect Host(New nexthop: 172.16.1.102)
if [ "$VERBOSE" = "1" ]; then
echo "Commands to check for exception:"
run_cmd ip -netns $h1 ro get ${H1_VRF_ARG} ${H2_N2_IP}
run_cmd ip -netns $h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6}
fi
if [ -n "${mtu}" ]; then
mtu=" mtu ${mtu}"
fi
if [ "$with_redirect" = "yes" ]; then
ip -netns $h1 ro get ${H1_VRF_ARG} ${H2_N2_IP} | \
grep -q "cache <redirected> expires [0-9]*sec${mtu}"
elif [ -n "${mtu}" ]; then
ip -netns $h1 ro get ${H1_VRF_ARG} ${H2_N2_IP} | \
grep -q "cache expires [0-9]*sec${mtu}"
else
# want to verify that neither mtu nor redirected appears in
# the route get output. The -v will wipe out the cache line
# if either are set so the last grep -q will not find a match
ip -netns $h1 ro get ${H1_VRF_ARG} ${H2_N2_IP} | \
grep -E -v 'mtu|redirected' | grep -q "cache"
fi
log_test $? 0 "IPv4: ${desc}" 0
# No PMTU info for test "redirect" and "mtu exception plus redirect"
if [ "$with_redirect" = "yes" ] && [ "$desc" != "redirect exception plus mtu" ]; then
ip -netns $h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} | \
grep -v "mtu" | grep -q "${H2_N2_IP6} .*via ${R2_LLADDR} dev br0"
elif [ -n "${mtu}" ]; then
ip -netns $h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} | \
grep -q "${mtu}"
else
# IPv6 is a bit harder. First strip out the match if it
# contains an mtu exception and then look for the first
# gateway - R1's lladdr
ip -netns $h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} | \
grep -v "mtu" | grep -q "${R1_LLADDR}"
fi
log_test $? 0 "IPv6: ${desc}" 1
}
run_ping()
{
local sz=$1
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}
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}
}
replace_route_new()
{
# r1 to h2 via r2 and eth0
run_cmd ip -netns $r1 nexthop replace id 1 via ${R2_N1_IP} dev eth0
run_cmd ip -netns $r1 nexthop replace id 2 via ${R2_LLADDR} dev eth0
}
reset_route_new()
{
run_cmd ip -netns $r1 nexthop flush
run_cmd ip -netns $h1 nexthop flush
initial_route_new
}
initial_route_new()
{
# r1 to h2 via r2 and eth1
run_cmd ip -netns $r1 nexthop add id 1 via ${R2_R1_N1_IP} dev eth1
run_cmd ip -netns $r1 ro add ${H2_N2} nhid 1
run_cmd ip -netns $r1 nexthop add id 2 via ${R2_R1_N1_IP6} dev eth1
run_cmd ip -netns $r1 -6 ro add ${H2_N2_6} nhid 2
# h1 to h2 via r1
run_cmd ip -netns $h1 nexthop add id 1 via ${R1_N1_IP} dev br0
run_cmd ip -netns $h1 ro add ${H1_VRF_ARG} ${H2_N2} nhid 1
run_cmd ip -netns $h1 nexthop add id 2 via ${R1_LLADDR} dev br0
run_cmd ip -netns $h1 -6 ro add ${H1_VRF_ARG} ${H2_N2_6} nhid 2
}
replace_route_legacy()
{
# r1 to h2 via r2 and eth0
run_cmd ip -netns $r1 ro replace ${H2_N2} via ${R2_N1_IP} dev eth0
run_cmd ip -netns $r1 -6 ro replace ${H2_N2_6} via ${R2_LLADDR} dev eth0
}
reset_route_legacy()
{
run_cmd ip -netns $r1 ro del ${H2_N2}
run_cmd ip -netns $r1 -6 ro del ${H2_N2_6}
run_cmd ip -netns $h1 ro del ${H1_VRF_ARG} ${H2_N2}
run_cmd ip -netns $h1 -6 ro del ${H1_VRF_ARG} ${H2_N2_6}
initial_route_legacy
}
initial_route_legacy()
{
# r1 to h2 via r2 and eth1
run_cmd ip -netns $r1 ro add ${H2_N2} via ${R2_R1_N1_IP} dev eth1
run_cmd ip -netns $r1 -6 ro add ${H2_N2_6} via ${R2_R1_N1_IP6} dev eth1
# h1 to h2 via r1
# - IPv6 redirect only works if gateway is the LLA
run_cmd ip -netns $h1 ro add ${H1_VRF_ARG} ${H2_N2} via ${R1_N1_IP} dev br0
run_cmd ip -netns $h1 -6 ro add ${H1_VRF_ARG} ${H2_N2_6} via ${R1_LLADDR} dev br0
}
check_connectivity()
{
local rc
run_cmd ip netns exec $h1 ping -c1 -w1 ${H1_PING_ARG} ${H2_N2_IP}
rc=$?
run_cmd ip netns exec $h1 ${ping6} -c1 -w1 ${H1_PING_ARG} ${H2_N2_IP6}
[ $? -ne 0 ] && rc=$?
return $rc
}
do_test()
{
local ttype="$1"
eval initial_route_${ttype}
# verify connectivity
check_connectivity
if [ $? -ne 0 ]; then
echo "Error: Basic connectivity is broken"
ret=1
return
fi
# redirect exception followed by mtu
eval replace_route_${ttype}
run_ping 64
check_exception "" "yes" "redirect exception"
check_connectivity
if [ $? -ne 0 ]; then
echo "Error: Basic connectivity is broken after redirect"
ret=1
return
fi
change_h2_mtu 1300
run_ping 1350
check_exception "1300" "yes" "redirect exception plus mtu"
# remove exceptions and restore routing
change_h2_mtu 1500
eval reset_route_${ttype}
check_connectivity
if [ $? -ne 0 ]; then
echo "Error: Basic connectivity is broken after reset"
ret=1
return
fi
check_exception "" "no" "routing reset"
# MTU exception followed by redirect
change_h2_mtu 1300
run_ping 1350
check_exception "1300" "no" "mtu exception"
eval replace_route_${ttype}
run_ping 64
check_exception "1300" "yes" "mtu exception plus redirect"
check_connectivity
if [ $? -ne 0 ]; then
echo "Error: Basic connectivity is broken after redirect"
ret=1
return
fi
}
################################################################################
# usage
usage()
{
cat <<EOF
usage: ${0##*/} OPTS
-p Pause on fail
-v verbose mode (show commands and output)
EOF
}
################################################################################
# main
# Some systems don't have a ping6 binary anymore
which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping)
ret=0
nsuccess=0
nfail=0
nxfail=0
while getopts :pv o
do
case $o in
p) PAUSE_ON_FAIL=yes;;
v) VERBOSE=$(($VERBOSE + 1));;
*) usage; exit 1;;
esac
done
trap cleanup EXIT
cleanup
WITH_VRF=no
setup
log_section "Legacy routing"
do_test "legacy"
cleanup
log_section "Legacy routing with VRF"
WITH_VRF=yes
setup
do_test "legacy"
cleanup
log_section "Routing with nexthop objects"
ip nexthop ls >/dev/null 2>&1
if [ $? -eq 0 ]; then
WITH_VRF=no
setup
do_test "new"
cleanup
log_section "Routing with nexthop objects and VRF"
WITH_VRF=yes
setup
do_test "new"
else
echo "Nexthop objects not supported; skipping tests"
fi
printf "\nTests passed: %3d\n" ${nsuccess}
printf "Tests failed: %3d\n" ${nfail}
printf "Tests xfailed: %3d\n" ${nxfail}
exit $ret
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