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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# In-place tunneling
BPF_FILE="test_tc_tunnel.bpf.o"
# must match the port that the bpf program filters on
readonly port=8000
readonly ns_prefix="ns-$$-"
readonly ns1="${ns_prefix}1"
readonly ns2="${ns_prefix}2"
readonly ns1_v4=192.168.1.1
readonly ns2_v4=192.168.1.2
readonly ns1_v6=fd::1
readonly ns2_v6=fd::2
# Must match port used by bpf program
readonly udpport=5555
# MPLSoverUDP
readonly mplsudpport=6635
readonly mplsproto=137
readonly infile="$(mktemp)"
readonly outfile="$(mktemp)"
setup() {
ip netns add "${ns1}"
ip netns add "${ns2}"
ip link add dev veth1 mtu 1500 netns "${ns1}" type veth \
peer name veth2 mtu 1500 netns "${ns2}"
ip netns exec "${ns1}" ethtool -K veth1 tso off
ip -netns "${ns1}" link set veth1 up
ip -netns "${ns2}" link set veth2 up
ip -netns "${ns1}" -4 addr add "${ns1_v4}/24" dev veth1
ip -netns "${ns2}" -4 addr add "${ns2_v4}/24" dev veth2
ip -netns "${ns1}" -6 addr add "${ns1_v6}/64" dev veth1 nodad
ip -netns "${ns2}" -6 addr add "${ns2_v6}/64" dev veth2 nodad
# clamp route to reserve room for tunnel headers
ip -netns "${ns1}" -4 route flush table main
ip -netns "${ns1}" -6 route flush table main
ip -netns "${ns1}" -4 route add "${ns2_v4}" mtu 1450 dev veth1
ip -netns "${ns1}" -6 route add "${ns2_v6}" mtu 1430 dev veth1
sleep 1
dd if=/dev/urandom of="${infile}" bs="${datalen}" count=1 status=none
}
cleanup() {
ip netns del "${ns2}"
ip netns del "${ns1}"
if [[ -f "${outfile}" ]]; then
rm "${outfile}"
fi
if [[ -f "${infile}" ]]; then
rm "${infile}"
fi
if [[ -n $server_pid ]]; then
kill $server_pid 2> /dev/null
fi
}
server_listen() {
ip netns exec "${ns2}" nc "${netcat_opt}" -l "${port}" > "${outfile}" &
server_pid=$!
}
client_connect() {
ip netns exec "${ns1}" timeout 2 nc "${netcat_opt}" -w 1 "${addr2}" "${port}" < "${infile}"
echo $?
}
verify_data() {
wait "${server_pid}"
server_pid=
# sha1sum returns two fields [sha1] [filepath]
# convert to bash array and access first elem
insum=($(sha1sum ${infile}))
outsum=($(sha1sum ${outfile}))
if [[ "${insum[0]}" != "${outsum[0]}" ]]; then
echo "data mismatch"
exit 1
fi
}
wait_for_port() {
for i in $(seq 20); do
if ip netns exec "${ns2}" ss ${2:--4}OHntl | grep -q "$1"; then
return 0
fi
sleep 0.1
done
return 1
}
set -e
# no arguments: automated test, run all
if [[ "$#" -eq "0" ]]; then
echo "ipip"
$0 ipv4 ipip none 100
echo "ipip6"
$0 ipv4 ipip6 none 100
echo "ip6ip6"
$0 ipv6 ip6tnl none 100
echo "sit"
$0 ipv6 sit none 100
echo "ip4 vxlan"
$0 ipv4 vxlan eth 2000
echo "ip6 vxlan"
$0 ipv6 ip6vxlan eth 2000
for mac in none mpls eth ; do
echo "ip gre $mac"
$0 ipv4 gre $mac 100
echo "ip6 gre $mac"
$0 ipv6 ip6gre $mac 100
echo "ip gre $mac gso"
$0 ipv4 gre $mac 2000
echo "ip6 gre $mac gso"
$0 ipv6 ip6gre $mac 2000
echo "ip udp $mac"
$0 ipv4 udp $mac 100
echo "ip6 udp $mac"
$0 ipv6 ip6udp $mac 100
echo "ip udp $mac gso"
$0 ipv4 udp $mac 2000
echo "ip6 udp $mac gso"
$0 ipv6 ip6udp $mac 2000
done
echo "OK. All tests passed"
exit 0
fi
if [[ "$#" -ne "4" ]]; then
echo "Usage: $0"
echo " or: $0 <ipv4|ipv6> <tuntype> <none|mpls|eth> <data_len>"
exit 1
fi
case "$1" in
"ipv4")
readonly addr1="${ns1_v4}"
readonly addr2="${ns2_v4}"
readonly ipproto=4
readonly netcat_opt=-${ipproto}
readonly foumod=fou
readonly foutype=ipip
readonly fouproto=4
readonly fouproto_mpls=${mplsproto}
readonly gretaptype=gretap
;;
"ipv6")
readonly addr1="${ns1_v6}"
readonly addr2="${ns2_v6}"
readonly ipproto=6
readonly netcat_opt=-${ipproto}
readonly foumod=fou6
readonly foutype=ip6tnl
readonly fouproto="41 -6"
readonly fouproto_mpls="${mplsproto} -6"
readonly gretaptype=ip6gretap
;;
*)
echo "unknown arg: $1"
exit 1
;;
esac
readonly tuntype=$2
readonly mac=$3
readonly datalen=$4
echo "encap ${addr1} to ${addr2}, type ${tuntype}, mac ${mac} len ${datalen}"
trap cleanup EXIT
setup
# basic communication works
echo "test basic connectivity"
server_listen
wait_for_port ${port} ${netcat_opt}
client_connect
verify_data
# clientside, insert bpf program to encap all TCP to port ${port}
# client can no longer connect
ip netns exec "${ns1}" tc qdisc add dev veth1 clsact
ip netns exec "${ns1}" tc filter add dev veth1 egress \
bpf direct-action object-file ${BPF_FILE} \
section "encap_${tuntype}_${mac}"
echo "test bpf encap without decap (expect failure)"
server_listen
wait_for_port ${port} ${netcat_opt}
! client_connect
if [[ "$tuntype" =~ "udp" ]]; then
# Set up fou tunnel.
ttype="${foutype}"
targs="encap fou encap-sport auto encap-dport $udpport"
# fou may be a module; allow this to fail.
modprobe "${foumod}" ||true
if [[ "$mac" == "mpls" ]]; then
dport=${mplsudpport}
dproto=${fouproto_mpls}
tmode="mode any ttl 255"
else
dport=${udpport}
dproto=${fouproto}
fi
ip netns exec "${ns2}" ip fou add port $dport ipproto ${dproto}
targs="encap fou encap-sport auto encap-dport $dport"
elif [[ "$tuntype" =~ "gre" && "$mac" == "eth" ]]; then
ttype=$gretaptype
elif [[ "$tuntype" =~ "vxlan" && "$mac" == "eth" ]]; then
ttype="vxlan"
targs="id 1 dstport 8472 udp6zerocsumrx"
elif [[ "$tuntype" == "ipip6" ]]; then
ttype="ip6tnl"
targs=""
else
ttype=$tuntype
targs=""
fi
# tunnel address family differs from inner for SIT
if [[ "${tuntype}" == "sit" ]]; then
link_addr1="${ns1_v4}"
link_addr2="${ns2_v4}"
elif [[ "${tuntype}" == "ipip6" ]]; then
link_addr1="${ns1_v6}"
link_addr2="${ns2_v6}"
else
link_addr1="${addr1}"
link_addr2="${addr2}"
fi
# serverside, insert decap module
# server is still running
# client can connect again
ip netns exec "${ns2}" ip link add name testtun0 type "${ttype}" \
${tmode} remote "${link_addr1}" local "${link_addr2}" $targs
expect_tun_fail=0
if [[ "$tuntype" == "ip6udp" && "$mac" == "mpls" ]]; then
# No support for MPLS IPv6 fou tunnel; expect failure.
expect_tun_fail=1
elif [[ "$tuntype" =~ "udp" && "$mac" == "eth" ]]; then
# No support for TEB fou tunnel; expect failure.
expect_tun_fail=1
elif [[ "$tuntype" =~ (gre|vxlan) && "$mac" == "eth" ]]; then
# Share ethernet address between tunnel/veth2 so L2 decap works.
ethaddr=$(ip netns exec "${ns2}" ip link show veth2 | \
awk '/ether/ { print $2 }')
ip netns exec "${ns2}" ip link set testtun0 address $ethaddr
elif [[ "$mac" == "mpls" ]]; then
modprobe mpls_iptunnel ||true
modprobe mpls_gso ||true
ip netns exec "${ns2}" sysctl -qw net.mpls.platform_labels=65536
ip netns exec "${ns2}" ip -f mpls route add 1000 dev lo
ip netns exec "${ns2}" ip link set lo up
ip netns exec "${ns2}" sysctl -qw net.mpls.conf.testtun0.input=1
ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.lo.rp_filter=0
fi
# Because packets are decapped by the tunnel they arrive on testtun0 from
# the IP stack perspective. Ensure reverse path filtering is disabled
# otherwise we drop the TCP SYN as arriving on testtun0 instead of the
# expected veth2 (veth2 is where 192.168.1.2 is configured).
ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.all.rp_filter=0
# rp needs to be disabled for both all and testtun0 as the rp value is
# selected as the max of the "all" and device-specific values.
ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.testtun0.rp_filter=0
ip netns exec "${ns2}" ip link set dev testtun0 up
if [[ "$expect_tun_fail" == 1 ]]; then
# This tunnel mode is not supported, so we expect failure.
echo "test bpf encap with tunnel device decap (expect failure)"
! client_connect
else
echo "test bpf encap with tunnel device decap"
client_connect
verify_data
server_listen
fi
# serverside, use BPF for decap
ip netns exec "${ns2}" ip link del dev testtun0
ip netns exec "${ns2}" tc qdisc add dev veth2 clsact
ip netns exec "${ns2}" tc filter add dev veth2 ingress \
bpf direct-action object-file ${BPF_FILE} section decap
echo "test bpf encap with bpf decap"
client_connect
verify_data
echo OK