1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3#
4# In-place tunneling
5
6# must match the port that the bpf program filters on
7readonly port=8000
8
9readonly ns_prefix="ns-$$-"
10readonly ns1="${ns_prefix}1"
11readonly ns2="${ns_prefix}2"
12
13readonly ns1_v4=192.168.1.1
14readonly ns2_v4=192.168.1.2
15readonly ns1_v6=fd::1
16readonly ns2_v6=fd::2
17
18# Must match port used by bpf program
19readonly udpport=5555
20# MPLSoverUDP
21readonly mplsudpport=6635
22readonly mplsproto=137
23
24readonly infile="$(mktemp)"
25readonly outfile="$(mktemp)"
26
27setup() {
28	ip netns add "${ns1}"
29	ip netns add "${ns2}"
30
31	ip link add dev veth1 mtu 1500 netns "${ns1}" type veth \
32	      peer name veth2 mtu 1500 netns "${ns2}"
33
34	ip netns exec "${ns1}" ethtool -K veth1 tso off
35
36	ip -netns "${ns1}" link set veth1 up
37	ip -netns "${ns2}" link set veth2 up
38
39	ip -netns "${ns1}" -4 addr add "${ns1_v4}/24" dev veth1
40	ip -netns "${ns2}" -4 addr add "${ns2_v4}/24" dev veth2
41	ip -netns "${ns1}" -6 addr add "${ns1_v6}/64" dev veth1 nodad
42	ip -netns "${ns2}" -6 addr add "${ns2_v6}/64" dev veth2 nodad
43
44	# clamp route to reserve room for tunnel headers
45	ip -netns "${ns1}" -4 route flush table main
46	ip -netns "${ns1}" -6 route flush table main
47	ip -netns "${ns1}" -4 route add "${ns2_v4}" mtu 1458 dev veth1
48	ip -netns "${ns1}" -6 route add "${ns2_v6}" mtu 1438 dev veth1
49
50	sleep 1
51
52	dd if=/dev/urandom of="${infile}" bs="${datalen}" count=1 status=none
53}
54
55cleanup() {
56	ip netns del "${ns2}"
57	ip netns del "${ns1}"
58
59	if [[ -f "${outfile}" ]]; then
60		rm "${outfile}"
61	fi
62	if [[ -f "${infile}" ]]; then
63		rm "${infile}"
64	fi
65
66	if [[ -n $server_pid ]]; then
67		kill $server_pid 2> /dev/null
68	fi
69}
70
71server_listen() {
72	ip netns exec "${ns2}" nc "${netcat_opt}" -l -p "${port}" > "${outfile}" &
73	server_pid=$!
74	sleep 0.2
75}
76
77client_connect() {
78	ip netns exec "${ns1}" timeout 2 nc "${netcat_opt}" -w 1 "${addr2}" "${port}" < "${infile}"
79	echo $?
80}
81
82verify_data() {
83	wait "${server_pid}"
84	server_pid=
85	# sha1sum returns two fields [sha1] [filepath]
86	# convert to bash array and access first elem
87	insum=($(sha1sum ${infile}))
88	outsum=($(sha1sum ${outfile}))
89	if [[ "${insum[0]}" != "${outsum[0]}" ]]; then
90		echo "data mismatch"
91		exit 1
92	fi
93}
94
95set -e
96
97# no arguments: automated test, run all
98if [[ "$#" -eq "0" ]]; then
99	echo "ipip"
100	$0 ipv4 ipip none 100
101
102	echo "ip6ip6"
103	$0 ipv6 ip6tnl none 100
104
105	echo "sit"
106	$0 ipv6 sit none 100
107
108	for mac in none mpls eth ; do
109		echo "ip gre $mac"
110		$0 ipv4 gre $mac 100
111
112		echo "ip6 gre $mac"
113		$0 ipv6 ip6gre $mac 100
114
115		echo "ip gre $mac gso"
116		$0 ipv4 gre $mac 2000
117
118		echo "ip6 gre $mac gso"
119		$0 ipv6 ip6gre $mac 2000
120
121		echo "ip udp $mac"
122		$0 ipv4 udp $mac 100
123
124		echo "ip6 udp $mac"
125		$0 ipv6 ip6udp $mac 100
126
127		echo "ip udp $mac gso"
128		$0 ipv4 udp $mac 2000
129
130		echo "ip6 udp $mac gso"
131		$0 ipv6 ip6udp $mac 2000
132	done
133
134	echo "OK. All tests passed"
135	exit 0
136fi
137
138if [[ "$#" -ne "4" ]]; then
139	echo "Usage: $0"
140	echo "   or: $0 <ipv4|ipv6> <tuntype> <none|mpls|eth> <data_len>"
141	exit 1
142fi
143
144case "$1" in
145"ipv4")
146	readonly addr1="${ns1_v4}"
147	readonly addr2="${ns2_v4}"
148	readonly ipproto=4
149	readonly netcat_opt=-${ipproto}
150	readonly foumod=fou
151	readonly foutype=ipip
152	readonly fouproto=4
153	readonly fouproto_mpls=${mplsproto}
154	readonly gretaptype=gretap
155	;;
156"ipv6")
157	readonly addr1="${ns1_v6}"
158	readonly addr2="${ns2_v6}"
159	readonly ipproto=6
160	readonly netcat_opt=-${ipproto}
161	readonly foumod=fou6
162	readonly foutype=ip6tnl
163	readonly fouproto="41 -6"
164	readonly fouproto_mpls="${mplsproto} -6"
165	readonly gretaptype=ip6gretap
166	;;
167*)
168	echo "unknown arg: $1"
169	exit 1
170	;;
171esac
172
173readonly tuntype=$2
174readonly mac=$3
175readonly datalen=$4
176
177echo "encap ${addr1} to ${addr2}, type ${tuntype}, mac ${mac} len ${datalen}"
178
179trap cleanup EXIT
180
181setup
182
183# basic communication works
184echo "test basic connectivity"
185server_listen
186client_connect
187verify_data
188
189# clientside, insert bpf program to encap all TCP to port ${port}
190# client can no longer connect
191ip netns exec "${ns1}" tc qdisc add dev veth1 clsact
192ip netns exec "${ns1}" tc filter add dev veth1 egress \
193	bpf direct-action object-file ./test_tc_tunnel.o \
194	section "encap_${tuntype}_${mac}"
195echo "test bpf encap without decap (expect failure)"
196server_listen
197! client_connect
198
199if [[ "$tuntype" =~ "udp" ]]; then
200	# Set up fou tunnel.
201	ttype="${foutype}"
202	targs="encap fou encap-sport auto encap-dport $udpport"
203	# fou may be a module; allow this to fail.
204	modprobe "${foumod}" ||true
205	if [[ "$mac" == "mpls" ]]; then
206		dport=${mplsudpport}
207		dproto=${fouproto_mpls}
208		tmode="mode any ttl 255"
209	else
210		dport=${udpport}
211		dproto=${fouproto}
212	fi
213	ip netns exec "${ns2}" ip fou add port $dport ipproto ${dproto}
214	targs="encap fou encap-sport auto encap-dport $dport"
215elif [[ "$tuntype" =~ "gre" && "$mac" == "eth" ]]; then
216	ttype=$gretaptype
217else
218	ttype=$tuntype
219	targs=""
220fi
221
222# tunnel address family differs from inner for SIT
223if [[ "${tuntype}" == "sit" ]]; then
224	link_addr1="${ns1_v4}"
225	link_addr2="${ns2_v4}"
226else
227	link_addr1="${addr1}"
228	link_addr2="${addr2}"
229fi
230
231# serverside, insert decap module
232# server is still running
233# client can connect again
234ip netns exec "${ns2}" ip link add name testtun0 type "${ttype}" \
235	${tmode} remote "${link_addr1}" local "${link_addr2}" $targs
236
237expect_tun_fail=0
238
239if [[ "$tuntype" == "ip6udp" && "$mac" == "mpls" ]]; then
240	# No support for MPLS IPv6 fou tunnel; expect failure.
241	expect_tun_fail=1
242elif [[ "$tuntype" =~ "udp" && "$mac" == "eth" ]]; then
243	# No support for TEB fou tunnel; expect failure.
244	expect_tun_fail=1
245elif [[ "$tuntype" =~ "gre" && "$mac" == "eth" ]]; then
246	# Share ethernet address between tunnel/veth2 so L2 decap works.
247	ethaddr=$(ip netns exec "${ns2}" ip link show veth2 | \
248		  awk '/ether/ { print $2 }')
249	ip netns exec "${ns2}" ip link set testtun0 address $ethaddr
250elif [[ "$mac" == "mpls" ]]; then
251	modprobe mpls_iptunnel ||true
252	modprobe mpls_gso ||true
253	ip netns exec "${ns2}" sysctl -qw net.mpls.platform_labels=65536
254	ip netns exec "${ns2}" ip -f mpls route add 1000 dev lo
255	ip netns exec "${ns2}" ip link set lo up
256	ip netns exec "${ns2}" sysctl -qw net.mpls.conf.testtun0.input=1
257	ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.lo.rp_filter=0
258fi
259
260# Because packets are decapped by the tunnel they arrive on testtun0 from
261# the IP stack perspective.  Ensure reverse path filtering is disabled
262# otherwise we drop the TCP SYN as arriving on testtun0 instead of the
263# expected veth2 (veth2 is where 192.168.1.2 is configured).
264ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.all.rp_filter=0
265# rp needs to be disabled for both all and testtun0 as the rp value is
266# selected as the max of the "all" and device-specific values.
267ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.testtun0.rp_filter=0
268ip netns exec "${ns2}" ip link set dev testtun0 up
269if [[ "$expect_tun_fail" == 1 ]]; then
270	# This tunnel mode is not supported, so we expect failure.
271	echo "test bpf encap with tunnel device decap (expect failure)"
272	! client_connect
273else
274	echo "test bpf encap with tunnel device decap"
275	client_connect
276	verify_data
277	server_listen
278fi
279
280# bpf_skb_net_shrink does not take tunnel flags yet, cannot update L3.
281if [[ "${tuntype}" == "sit" ]]; then
282	echo OK
283	exit 0
284fi
285
286# serverside, use BPF for decap
287ip netns exec "${ns2}" ip link del dev testtun0
288ip netns exec "${ns2}" tc qdisc add dev veth2 clsact
289ip netns exec "${ns2}" tc filter add dev veth2 ingress \
290	bpf direct-action object-file ./test_tc_tunnel.o section decap
291echo "test bpf encap with bpf decap"
292client_connect
293verify_data
294
295echo OK
296