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 "${ns2_v4}" mtu 1450 dev veth1
48	ip -netns "${ns1}" -6 route add "${ns2_v6}" mtu 1430 dev veth1
49
50	sleep 1
51
52	dd if=/dev/urandom of="${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	echo "ip4 vxlan"
109	$0 ipv4 vxlan eth 2000
110
111	echo "ip6 vxlan"
112	$0 ipv6 ip6vxlan eth 2000
113
114	for mac in none mpls eth ; do
115		echo "ip gre $mac"
116		$0 ipv4 gre $mac 100
117
118		echo "ip6 gre $mac"
119		$0 ipv6 ip6gre $mac 100
120
121		echo "ip gre $mac gso"
122		$0 ipv4 gre $mac 2000
123
124		echo "ip6 gre $mac gso"
125		$0 ipv6 ip6gre $mac 2000
126
127		echo "ip udp $mac"
128		$0 ipv4 udp $mac 100
129
130		echo "ip6 udp $mac"
131		$0 ipv6 ip6udp $mac 100
132
133		echo "ip udp $mac gso"
134		$0 ipv4 udp $mac 2000
135
136		echo "ip6 udp $mac gso"
137		$0 ipv6 ip6udp $mac 2000
138	done
139
140	echo "OK. All tests passed"
141	exit 0
142fi
143
144if [[ "$#" -ne "4" ]]; then
145	echo "Usage: $0"
146	echo "   or: $0 <ipv4|ipv6> <tuntype> <none|mpls|eth> <data_len>"
147	exit 1
148fi
149
150case "$1" in
151"ipv4")
152	readonly addr1="${ns1_v4}"
153	readonly addr2="${ns2_v4}"
154	readonly ipproto=4
155	readonly netcat_opt=-${ipproto}
156	readonly foumod=fou
157	readonly foutype=ipip
158	readonly fouproto=4
159	readonly fouproto_mpls=${mplsproto}
160	readonly gretaptype=gretap
161	;;
162"ipv6")
163	readonly addr1="${ns1_v6}"
164	readonly addr2="${ns2_v6}"
165	readonly ipproto=6
166	readonly netcat_opt=-${ipproto}
167	readonly foumod=fou6
168	readonly foutype=ip6tnl
169	readonly fouproto="41 -6"
170	readonly fouproto_mpls="${mplsproto} -6"
171	readonly gretaptype=ip6gretap
172	;;
173*)
174	echo "unknown arg: $1"
175	exit 1
176	;;
177esac
178
179readonly tuntype=$2
180readonly mac=$3
181readonly datalen=$4
182
183echo "encap ${addr1} to ${addr2}, type ${tuntype}, mac ${mac} len ${datalen}"
184
185trap cleanup EXIT
186
187setup
188
189# basic communication works
190echo "test basic connectivity"
191server_listen
192client_connect
193verify_data
194
195# clientside, insert bpf program to encap all TCP to port ${port}
196# client can no longer connect
197ip netns exec "${ns1}" tc qdisc add dev veth1 clsact
198ip netns exec "${ns1}" tc filter add dev veth1 egress \
199	bpf direct-action object-file ./test_tc_tunnel.o \
200	section "encap_${tuntype}_${mac}"
201echo "test bpf encap without decap (expect failure)"
202server_listen
203! client_connect
204
205if [[ "$tuntype" =~ "udp" ]]; then
206	# Set up fou tunnel.
207	ttype="${foutype}"
208	targs="encap fou encap-sport auto encap-dport $udpport"
209	# fou may be a module; allow this to fail.
210	modprobe "${foumod}" ||true
211	if [[ "$mac" == "mpls" ]]; then
212		dport=${mplsudpport}
213		dproto=${fouproto_mpls}
214		tmode="mode any ttl 255"
215	else
216		dport=${udpport}
217		dproto=${fouproto}
218	fi
219	ip netns exec "${ns2}" ip fou add port $dport ipproto ${dproto}
220	targs="encap fou encap-sport auto encap-dport $dport"
221elif [[ "$tuntype" =~ "gre" && "$mac" == "eth" ]]; then
222	ttype=$gretaptype
223elif [[ "$tuntype" =~ "vxlan" && "$mac" == "eth" ]]; then
224	ttype="vxlan"
225	targs="id 1 dstport 8472 udp6zerocsumrx"
226else
227	ttype=$tuntype
228	targs=""
229fi
230
231# tunnel address family differs from inner for SIT
232if [[ "${tuntype}" == "sit" ]]; then
233	link_addr1="${ns1_v4}"
234	link_addr2="${ns2_v4}"
235else
236	link_addr1="${addr1}"
237	link_addr2="${addr2}"
238fi
239
240# serverside, insert decap module
241# server is still running
242# client can connect again
243ip netns exec "${ns2}" ip link add name testtun0 type "${ttype}" \
244	${tmode} remote "${link_addr1}" local "${link_addr2}" $targs
245
246expect_tun_fail=0
247
248if [[ "$tuntype" == "ip6udp" && "$mac" == "mpls" ]]; then
249	# No support for MPLS IPv6 fou tunnel; expect failure.
250	expect_tun_fail=1
251elif [[ "$tuntype" =~ "udp" && "$mac" == "eth" ]]; then
252	# No support for TEB fou tunnel; expect failure.
253	expect_tun_fail=1
254elif [[ "$tuntype" =~ (gre|vxlan) && "$mac" == "eth" ]]; then
255	# Share ethernet address between tunnel/veth2 so L2 decap works.
256	ethaddr=$(ip netns exec "${ns2}" ip link show veth2 | \
257		  awk '/ether/ { print $2 }')
258	ip netns exec "${ns2}" ip link set testtun0 address $ethaddr
259elif [[ "$mac" == "mpls" ]]; then
260	modprobe mpls_iptunnel ||true
261	modprobe mpls_gso ||true
262	ip netns exec "${ns2}" sysctl -qw net.mpls.platform_labels=65536
263	ip netns exec "${ns2}" ip -f mpls route add 1000 dev lo
264	ip netns exec "${ns2}" ip link set lo up
265	ip netns exec "${ns2}" sysctl -qw net.mpls.conf.testtun0.input=1
266	ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.lo.rp_filter=0
267fi
268
269# Because packets are decapped by the tunnel they arrive on testtun0 from
270# the IP stack perspective.  Ensure reverse path filtering is disabled
271# otherwise we drop the TCP SYN as arriving on testtun0 instead of the
272# expected veth2 (veth2 is where 192.168.1.2 is configured).
273ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.all.rp_filter=0
274# rp needs to be disabled for both all and testtun0 as the rp value is
275# selected as the max of the "all" and device-specific values.
276ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.testtun0.rp_filter=0
277ip netns exec "${ns2}" ip link set dev testtun0 up
278if [[ "$expect_tun_fail" == 1 ]]; then
279	# This tunnel mode is not supported, so we expect failure.
280	echo "test bpf encap with tunnel device decap (expect failure)"
281	! client_connect
282else
283	echo "test bpf encap with tunnel device decap"
284	client_connect
285	verify_data
286	server_listen
287fi
288
289# bpf_skb_net_shrink does not take tunnel flags yet, cannot update L3.
290if [[ "${tuntype}" == "sit" ]]; then
291	echo OK
292	exit 0
293fi
294
295# serverside, use BPF for decap
296ip netns exec "${ns2}" ip link del dev testtun0
297ip netns exec "${ns2}" tc qdisc add dev veth2 clsact
298ip netns exec "${ns2}" tc filter add dev veth2 ingress \
299	bpf direct-action object-file ./test_tc_tunnel.o section decap
300echo "test bpf encap with bpf decap"
301client_connect
302verify_data
303
304echo OK
305