summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/net/mptcp/mptcp_connect.sh
blob: 5b7a40d73253b3051189cfd913557d9af2dd085e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0

time_start=$(date +%s)

optstring="S:R:d:e:l:r:h4cm:f:tC"
ret=0
sin=""
sout=""
cin_disconnect=""
cin=""
cout=""
ksft_skip=4
capture=false
timeout_poll=30
timeout_test=$((timeout_poll * 2 + 1))
ipv6=true
ethtool_random_on=true
tc_delay="$((RANDOM%50))"
tc_loss=$((RANDOM%101))
testmode=""
sndbuf=0
rcvbuf=0
options_log=true
do_tcp=0
checksum=false
filesize=0
connect_per_transfer=1

if [ $tc_loss -eq 100 ];then
	tc_loss=1%
elif [ $tc_loss -ge 10 ]; then
	tc_loss=0.$tc_loss%
elif [ $tc_loss -ge 1 ]; then
	tc_loss=0.0$tc_loss%
else
	tc_loss=""
fi

usage() {
	echo "Usage: $0 [ -a ]"
	echo -e "\t-d: tc/netem delay in milliseconds, e.g. \"-d 10\" (default random)"
	echo -e "\t-l: tc/netem loss percentage, e.g. \"-l 0.02\" (default random)"
	echo -e "\t-r: tc/netem reorder mode, e.g. \"-r 25% 50% gap 5\", use "-r 0" to disable reordering (default random)"
	echo -e "\t-e: ethtool features to disable, e.g.: \"-e tso -e gso\" (default: randomly disable any of tso/gso/gro)"
	echo -e "\t-4: IPv4 only: disable IPv6 tests (default: test both IPv4 and IPv6)"
	echo -e "\t-c: capture packets for each test using tcpdump (default: no capture)"
	echo -e "\t-f: size of file to transfer in bytes (default random)"
	echo -e "\t-S: set sndbuf value (default: use kernel default)"
	echo -e "\t-R: set rcvbuf value (default: use kernel default)"
	echo -e "\t-m: test mode (poll, sendfile; default: poll)"
	echo -e "\t-t: also run tests with TCP (use twice to non-fallback tcp)"
	echo -e "\t-C: enable the MPTCP data checksum"
}

while getopts "$optstring" option;do
	case "$option" in
	"h")
		usage $0
		exit 0
		;;
	"d")
		if [ $OPTARG -ge 0 ];then
			tc_delay="$OPTARG"
		else
			echo "-d requires numeric argument, got \"$OPTARG\"" 1>&2
			exit 1
		fi
		;;
	"e")
		ethtool_args="$ethtool_args $OPTARG off"
		ethtool_random_on=false
		;;
	"l")
		tc_loss="$OPTARG"
		;;
	"r")
		tc_reorder="$OPTARG"
		;;
	"4")
		ipv6=false
		;;
	"c")
		capture=true
		;;
	"S")
		if [ $OPTARG -ge 0 ];then
			sndbuf="$OPTARG"
		else
			echo "-S requires numeric argument, got \"$OPTARG\"" 1>&2
			exit 1
		fi
		;;
	"R")
		if [ $OPTARG -ge 0 ];then
			rcvbuf="$OPTARG"
		else
			echo "-R requires numeric argument, got \"$OPTARG\"" 1>&2
			exit 1
		fi
		;;
	"m")
		testmode="$OPTARG"
		;;
	"f")
		filesize="$OPTARG"
		;;
	"t")
		do_tcp=$((do_tcp+1))
		;;
	"C")
		checksum=true
		;;
	"?")
		usage $0
		exit 1
		;;
	esac
done

sec=$(date +%s)
rndh=$(printf %x $sec)-$(mktemp -u XXXXXX)
ns1="ns1-$rndh"
ns2="ns2-$rndh"
ns3="ns3-$rndh"
ns4="ns4-$rndh"

TEST_COUNT=0

cleanup()
{
	rm -f "$cin_disconnect" "$cout_disconnect"
	rm -f "$cin" "$cout"
	rm -f "$sin" "$sout"
	rm -f "$capout"

	local netns
	for netns in "$ns1" "$ns2" "$ns3" "$ns4";do
		ip netns del $netns
		rm -f /tmp/$netns.{nstat,out}
	done
}

ip -Version > /dev/null 2>&1
if [ $? -ne 0 ];then
	echo "SKIP: Could not run test without ip tool"
	exit $ksft_skip
fi

sin=$(mktemp)
sout=$(mktemp)
cin=$(mktemp)
cout=$(mktemp)
capout=$(mktemp)
cin_disconnect="$cin".disconnect
cout_disconnect="$cout".disconnect
trap cleanup EXIT

for i in "$ns1" "$ns2" "$ns3" "$ns4";do
	ip netns add $i || exit $ksft_skip
	ip -net $i link set lo up
done

#  "$ns1"              ns2                    ns3                     ns4
# ns1eth2    ns2eth1   ns2eth3      ns3eth2   ns3eth4       ns4eth3
#                           - drop 1% ->            reorder 25%
#                           <- TSO off -

ip link add ns1eth2 netns "$ns1" type veth peer name ns2eth1 netns "$ns2"
ip link add ns2eth3 netns "$ns2" type veth peer name ns3eth2 netns "$ns3"
ip link add ns3eth4 netns "$ns3" type veth peer name ns4eth3 netns "$ns4"

ip -net "$ns1" addr add 10.0.1.1/24 dev ns1eth2
ip -net "$ns1" addr add dead:beef:1::1/64 dev ns1eth2 nodad

ip -net "$ns1" link set ns1eth2 up
ip -net "$ns1" route add default via 10.0.1.2
ip -net "$ns1" route add default via dead:beef:1::2

ip -net "$ns2" addr add 10.0.1.2/24 dev ns2eth1
ip -net "$ns2" addr add dead:beef:1::2/64 dev ns2eth1 nodad
ip -net "$ns2" link set ns2eth1 up

ip -net "$ns2" addr add 10.0.2.1/24 dev ns2eth3
ip -net "$ns2" addr add dead:beef:2::1/64 dev ns2eth3 nodad
ip -net "$ns2" link set ns2eth3 up
ip -net "$ns2" route add default via 10.0.2.2
ip -net "$ns2" route add default via dead:beef:2::2
ip netns exec "$ns2" sysctl -q net.ipv4.ip_forward=1
ip netns exec "$ns2" sysctl -q net.ipv6.conf.all.forwarding=1

ip -net "$ns3" addr add 10.0.2.2/24 dev ns3eth2
ip -net "$ns3" addr add dead:beef:2::2/64 dev ns3eth2 nodad
ip -net "$ns3" link set ns3eth2 up

ip -net "$ns3" addr add 10.0.3.2/24 dev ns3eth4
ip -net "$ns3" addr add dead:beef:3::2/64 dev ns3eth4 nodad
ip -net "$ns3" link set ns3eth4 up
ip -net "$ns3" route add default via 10.0.2.1
ip -net "$ns3" route add default via dead:beef:2::1
ip netns exec "$ns3" sysctl -q net.ipv4.ip_forward=1
ip netns exec "$ns3" sysctl -q net.ipv6.conf.all.forwarding=1

ip -net "$ns4" addr add 10.0.3.1/24 dev ns4eth3
ip -net "$ns4" addr add dead:beef:3::1/64 dev ns4eth3 nodad
ip -net "$ns4" link set ns4eth3 up
ip -net "$ns4" route add default via 10.0.3.2
ip -net "$ns4" route add default via dead:beef:3::2

if $checksum; then
	for i in "$ns1" "$ns2" "$ns3" "$ns4";do
		ip netns exec $i sysctl -q net.mptcp.checksum_enabled=1
	done
fi

set_ethtool_flags() {
	local ns="$1"
	local dev="$2"
	local flags="$3"

	ip netns exec $ns ethtool -K $dev $flags 2>/dev/null
	[ $? -eq 0 ] && echo "INFO: set $ns dev $dev: ethtool -K $flags"
}

set_random_ethtool_flags() {
	local flags=""
	local r=$RANDOM

	local pick1=$((r & 1))
	local pick2=$((r & 2))
	local pick3=$((r & 4))

	[ $pick1 -ne 0 ] && flags="tso off"
	[ $pick2 -ne 0 ] && flags="$flags gso off"
	[ $pick3 -ne 0 ] && flags="$flags gro off"

	[ -z "$flags" ] && return

	set_ethtool_flags "$1" "$2" "$flags"
}

if $ethtool_random_on;then
	set_random_ethtool_flags "$ns3" ns3eth2
	set_random_ethtool_flags "$ns4" ns4eth3
else
	set_ethtool_flags "$ns3" ns3eth2 "$ethtool_args"
	set_ethtool_flags "$ns4" ns4eth3 "$ethtool_args"
fi

print_file_err()
{
	ls -l "$1" 1>&2
	echo "Trailing bytes are: "
	tail -c 27 "$1"
}

check_transfer()
{
	local in=$1
	local out=$2
	local what=$3

	cmp "$in" "$out" > /dev/null 2>&1
	if [ $? -ne 0 ] ;then
		echo "[ FAIL ] $what does not match (in, out):"
		print_file_err "$in"
		print_file_err "$out"

		return 1
	fi

	return 0
}

check_mptcp_disabled()
{
	local disabled_ns
	disabled_ns="ns_disabled-$sech-$(mktemp -u XXXXXX)"
	ip netns add ${disabled_ns} || exit $ksft_skip

	# net.mptcp.enabled should be enabled by default
	if [ "$(ip netns exec ${disabled_ns} sysctl net.mptcp.enabled | awk '{ print $3 }')" -ne 1 ]; then
		echo -e "net.mptcp.enabled sysctl is not 1 by default\t\t[ FAIL ]"
		ret=1
		return 1
	fi
	ip netns exec ${disabled_ns} sysctl -q net.mptcp.enabled=0

	local err=0
	LC_ALL=C ip netns exec ${disabled_ns} ./mptcp_connect -p 10000 -s MPTCP 127.0.0.1 < "$cin" 2>&1 | \
		grep -q "^socket: Protocol not available$" && err=1
	ip netns delete ${disabled_ns}

	if [ ${err} -eq 0 ]; then
		echo -e "New MPTCP socket cannot be blocked via sysctl\t\t[ FAIL ]"
		ret=1
		return 1
	fi

	echo -e "New MPTCP socket can be blocked via sysctl\t\t[ OK ]"
	return 0
}

# $1: IP address
is_v6()
{
	[ -z "${1##*:*}" ]
}

do_ping()
{
	local listener_ns="$1"
	local connector_ns="$2"
	local connect_addr="$3"
	local ping_args="-q -c 1"

	if is_v6 "${connect_addr}"; then
		$ipv6 || return 0
		ping_args="${ping_args} -6"
	fi

	ip netns exec ${connector_ns} ping ${ping_args} $connect_addr >/dev/null
	if [ $? -ne 0 ] ; then
		echo "$listener_ns -> $connect_addr connectivity [ FAIL ]" 1>&2
		ret=1

		return 1
	fi

	return 0
}

# $1: ns, $2: MIB counter
get_mib_counter()
{
	local listener_ns="${1}"
	local mib="${2}"

	# strip the header
	ip netns exec "${listener_ns}" \
		nstat -z -a "${mib}" | \
			tail -n+2 | \
			while read a count c rest; do
				echo $count
			done
}

# $1: ns, $2: port
wait_local_port_listen()
{
	local listener_ns="${1}"
	local port="${2}"

	local port_hex i

	port_hex="$(printf "%04X" "${port}")"
	for i in $(seq 10); do
		ip netns exec "${listener_ns}" cat /proc/net/tcp* | \
			awk "BEGIN {rc=1} {if (\$2 ~ /:${port_hex}\$/ && \$4 ~ /0A/) {rc=0; exit}} END {exit rc}" &&
			break
		sleep 0.1
	done
}

do_transfer()
{
	local listener_ns="$1"
	local connector_ns="$2"
	local cl_proto="$3"
	local srv_proto="$4"
	local connect_addr="$5"
	local local_addr="$6"
	local extra_args="$7"

	local port
	port=$((10000+$TEST_COUNT))
	TEST_COUNT=$((TEST_COUNT+1))

	if [ "$rcvbuf" -gt 0 ]; then
		extra_args="$extra_args -R $rcvbuf"
	fi

	if [ "$sndbuf" -gt 0 ]; then
		extra_args="$extra_args -S $sndbuf"
	fi

	if [ -n "$testmode" ]; then
		extra_args="$extra_args -m $testmode"
	fi

	if [ -n "$extra_args" ] && $options_log; then
		echo "INFO: extra options: $extra_args"
	fi
	options_log=false

	:> "$cout"
	:> "$sout"
	:> "$capout"

	local addr_port
	addr_port=$(printf "%s:%d" ${connect_addr} ${port})
	printf "%.3s %-5s -> %.3s (%-20s) %-5s\t" ${connector_ns} ${cl_proto} ${listener_ns} ${addr_port} ${srv_proto}

	if $capture; then
		local capuser
		if [ -z $SUDO_USER ] ; then
			capuser=""
		else
			capuser="-Z $SUDO_USER"
		fi

		local capfile="${rndh}-${connector_ns:0:3}-${listener_ns:0:3}-${cl_proto}-${srv_proto}-${connect_addr}-${port}"
		local capopt="-i any -s 65535 -B 32768 ${capuser}"

		ip netns exec ${listener_ns}  tcpdump ${capopt} -w "${capfile}-listener.pcap"  >> "${capout}" 2>&1 &
		local cappid_listener=$!

		ip netns exec ${connector_ns} tcpdump ${capopt} -w "${capfile}-connector.pcap" >> "${capout}" 2>&1 &
		local cappid_connector=$!

		sleep 1
	fi

	NSTAT_HISTORY=/tmp/${listener_ns}.nstat ip netns exec ${listener_ns} \
		nstat -n
	if [ ${listener_ns} != ${connector_ns} ]; then
		NSTAT_HISTORY=/tmp/${connector_ns}.nstat ip netns exec ${connector_ns} \
			nstat -n
	fi

	local stat_synrx_last_l=$(get_mib_counter "${listener_ns}" "MPTcpExtMPCapableSYNRX")
	local stat_ackrx_last_l=$(get_mib_counter "${listener_ns}" "MPTcpExtMPCapableACKRX")
	local stat_cookietx_last=$(get_mib_counter "${listener_ns}" "TcpExtSyncookiesSent")
	local stat_cookierx_last=$(get_mib_counter "${listener_ns}" "TcpExtSyncookiesRecv")
	local stat_csum_err_s=$(get_mib_counter "${listener_ns}" "MPTcpExtDataCsumErr")
	local stat_csum_err_c=$(get_mib_counter "${connector_ns}" "MPTcpExtDataCsumErr")

	timeout ${timeout_test} \
		ip netns exec ${listener_ns} \
			./mptcp_connect -t ${timeout_poll} -l -p $port -s ${srv_proto} \
				$extra_args $local_addr < "$sin" > "$sout" &
	local spid=$!

	wait_local_port_listen "${listener_ns}" "${port}"

	local start
	start=$(date +%s%3N)
	timeout ${timeout_test} \
		ip netns exec ${connector_ns} \
			./mptcp_connect -t ${timeout_poll} -p $port -s ${cl_proto} \
				$extra_args $connect_addr < "$cin" > "$cout" &
	local cpid=$!

	wait $cpid
	local retc=$?
	wait $spid
	local rets=$?

	local stop
	stop=$(date +%s%3N)

	if $capture; then
		sleep 1
		kill ${cappid_listener}
		kill ${cappid_connector}
	fi

	NSTAT_HISTORY=/tmp/${listener_ns}.nstat ip netns exec ${listener_ns} \
		nstat | grep Tcp > /tmp/${listener_ns}.out
	if [ ${listener_ns} != ${connector_ns} ]; then
		NSTAT_HISTORY=/tmp/${connector_ns}.nstat ip netns exec ${connector_ns} \
			nstat | grep Tcp > /tmp/${connector_ns}.out
	fi

	local duration
	duration=$((stop-start))
	printf "(duration %05sms) " "${duration}"
	if [ ${rets} -ne 0 ] || [ ${retc} -ne 0 ]; then
		echo "[ FAIL ] client exit code $retc, server $rets" 1>&2
		echo -e "\nnetns ${listener_ns} socket stat for ${port}:" 1>&2
		ip netns exec ${listener_ns} ss -Menita 1>&2 -o "sport = :$port"
		cat /tmp/${listener_ns}.out
		echo -e "\nnetns ${connector_ns} socket stat for ${port}:" 1>&2
		ip netns exec ${connector_ns} ss -Menita 1>&2 -o "dport = :$port"
		[ ${listener_ns} != ${connector_ns} ] && cat /tmp/${connector_ns}.out

		echo
		cat "$capout"
		return 1
	fi

	check_transfer $sin $cout "file received by client"
	retc=$?
	check_transfer $cin $sout "file received by server"
	rets=$?

	local stat_synrx_now_l=$(get_mib_counter "${listener_ns}" "MPTcpExtMPCapableSYNRX")
	local stat_ackrx_now_l=$(get_mib_counter "${listener_ns}" "MPTcpExtMPCapableACKRX")
	local stat_cookietx_now=$(get_mib_counter "${listener_ns}" "TcpExtSyncookiesSent")
	local stat_cookierx_now=$(get_mib_counter "${listener_ns}" "TcpExtSyncookiesRecv")
	local stat_ooo_now=$(get_mib_counter "${listener_ns}" "TcpExtTCPOFOQueue")

	expect_synrx=$((stat_synrx_last_l))
	expect_ackrx=$((stat_ackrx_last_l))

	cookies=$(ip netns exec ${listener_ns} sysctl net.ipv4.tcp_syncookies)
	cookies=${cookies##*=}

	if [ ${cl_proto} = "MPTCP" ] && [ ${srv_proto} = "MPTCP" ]; then
		expect_synrx=$((stat_synrx_last_l+$connect_per_transfer))
		expect_ackrx=$((stat_ackrx_last_l+$connect_per_transfer))
	fi

	if [ ${stat_synrx_now_l} -lt ${expect_synrx} ]; then
		printf "[ FAIL ] lower MPC SYN rx (%d) than expected (%d)\n" \
			"${stat_synrx_now_l}" "${expect_synrx}" 1>&2
		retc=1
	fi
	if [ ${stat_ackrx_now_l} -lt ${expect_ackrx} -a ${stat_ooo_now} -eq 0 ]; then
		if [ ${stat_ooo_now} -eq 0 ]; then
			printf "[ FAIL ] lower MPC ACK rx (%d) than expected (%d)\n" \
				"${stat_ackrx_now_l}" "${expect_ackrx}" 1>&2
			rets=1
		else
			printf "[ Note ] fallback due to TCP OoO"
		fi
	fi

	if $checksum; then
		local csum_err_s=$(get_mib_counter "${listener_ns}" "MPTcpExtDataCsumErr")
		local csum_err_c=$(get_mib_counter "${connector_ns}" "MPTcpExtDataCsumErr")

		local csum_err_s_nr=$((csum_err_s - stat_csum_err_s))
		if [ $csum_err_s_nr -gt 0 ]; then
			printf "[ FAIL ]\nserver got $csum_err_s_nr data checksum error[s]"
			rets=1
		fi

		local csum_err_c_nr=$((csum_err_c - stat_csum_err_c))
		if [ $csum_err_c_nr -gt 0 ]; then
			printf "[ FAIL ]\nclient got $csum_err_c_nr data checksum error[s]"
			retc=1
		fi
	fi

	if [ $retc -eq 0 ] && [ $rets -eq 0 ]; then
		printf "[ OK ]"
	fi

	if [ $cookies -eq 2 ];then
		if [ $stat_cookietx_last -ge $stat_cookietx_now ] ;then
			printf " WARN: CookieSent: did not advance"
		fi
		if [ $stat_cookierx_last -ge $stat_cookierx_now ] ;then
			printf " WARN: CookieRecv: did not advance"
		fi
	else
		if [ $stat_cookietx_last -ne $stat_cookietx_now ] ;then
			printf " WARN: CookieSent: changed"
		fi
		if [ $stat_cookierx_last -ne $stat_cookierx_now ] ;then
			printf " WARN: CookieRecv: changed"
		fi
	fi

	if [ ${stat_synrx_now_l} -gt ${expect_synrx} ]; then
		printf " WARN: SYNRX: expect %d, got %d (probably retransmissions)" \
			"${expect_synrx}" "${stat_synrx_now_l}"
	fi
	if [ ${stat_ackrx_now_l} -gt ${expect_ackrx} ]; then
		printf " WARN: ACKRX: expect %d, got %d (probably retransmissions)" \
			"${expect_ackrx}" "${stat_ackrx_now_l}"
	fi

	echo
	cat "$capout"
	[ $retc -eq 0 ] && [ $rets -eq 0 ]
}

make_file()
{
	local name=$1
	local who=$2
	local SIZE=$filesize
	local ksize
	local rem

	if [ $SIZE -eq 0 ]; then
		local MAXSIZE=$((1024 * 1024 * 8))
		local MINSIZE=$((1024 * 256))

		SIZE=$(((RANDOM * RANDOM + MINSIZE) % MAXSIZE))
	fi

	ksize=$((SIZE / 1024))
	rem=$((SIZE - (ksize * 1024)))

	dd if=/dev/urandom of="$name" bs=1024 count=$ksize 2> /dev/null
	dd if=/dev/urandom conv=notrunc of="$name" bs=1 count=$rem 2> /dev/null
	echo -e "\nMPTCP_TEST_FILE_END_MARKER" >> "$name"

	echo "Created $name (size $(du -b "$name")) containing data sent by $who"
}

run_tests_lo()
{
	local listener_ns="$1"
	local connector_ns="$2"
	local connect_addr="$3"
	local loopback="$4"
	local extra_args="$5"
	local lret=0

	# skip if test programs are running inside same netns for subsequent runs.
	if [ $loopback -eq 0 ] && [ ${listener_ns} = ${connector_ns} ]; then
		return 0
	fi

	# skip if we don't want v6
	if ! $ipv6 && is_v6 "${connect_addr}"; then
		return 0
	fi

	local local_addr
	if is_v6 "${connect_addr}"; then
		local_addr="::"
	else
		local_addr="0.0.0.0"
	fi

	do_transfer ${listener_ns} ${connector_ns} MPTCP MPTCP \
		    ${connect_addr} ${local_addr} "${extra_args}"
	lret=$?
	if [ $lret -ne 0 ]; then
		ret=$lret
		return 1
	fi

	if [ $do_tcp -eq 0 ]; then
		# don't bother testing fallback tcp except for loopback case.
		if [ ${listener_ns} != ${connector_ns} ]; then
			return 0
		fi
	fi

	do_transfer ${listener_ns} ${connector_ns} MPTCP TCP \
		    ${connect_addr} ${local_addr} "${extra_args}"
	lret=$?
	if [ $lret -ne 0 ]; then
		ret=$lret
		return 1
	fi

	do_transfer ${listener_ns} ${connector_ns} TCP MPTCP \
		    ${connect_addr} ${local_addr} "${extra_args}"
	lret=$?
	if [ $lret -ne 0 ]; then
		ret=$lret
		return 1
	fi

	if [ $do_tcp -gt 1 ] ;then
		do_transfer ${listener_ns} ${connector_ns} TCP TCP \
			    ${connect_addr} ${local_addr} "${extra_args}"
		lret=$?
		if [ $lret -ne 0 ]; then
			ret=$lret
			return 1
		fi
	fi

	return 0
}

run_tests()
{
	run_tests_lo $1 $2 $3 0
}

run_test_transparent()
{
	local connect_addr="$1"
	local msg="$2"

	local connector_ns="$ns1"
	local listener_ns="$ns2"
	local lret=0
	local r6flag=""

	# skip if we don't want v6
	if ! $ipv6 && is_v6 "${connect_addr}"; then
		return 0
	fi

ip netns exec "$listener_ns" nft -f /dev/stdin <<"EOF"
flush ruleset
table inet mangle {
	chain divert {
		type filter hook prerouting priority -150;

		meta l4proto tcp socket transparent 1 meta mark set 1 accept
		tcp dport 20000 tproxy to :20000 meta mark set 1 accept
	}
}
EOF
	if [ $? -ne 0 ]; then
		echo "SKIP: $msg, could not load nft ruleset"
		return
	fi

	local local_addr
	if is_v6 "${connect_addr}"; then
		local_addr="::"
		r6flag="-6"
	else
		local_addr="0.0.0.0"
	fi

	ip -net "$listener_ns" $r6flag rule add fwmark 1 lookup 100
	if [ $? -ne 0 ]; then
		ip netns exec "$listener_ns" nft flush ruleset
		echo "SKIP: $msg, ip $r6flag rule failed"
		return
	fi

	ip -net "$listener_ns" route add local $local_addr/0 dev lo table 100
	if [ $? -ne 0 ]; then
		ip netns exec "$listener_ns" nft flush ruleset
		ip -net "$listener_ns" $r6flag rule del fwmark 1 lookup 100
		echo "SKIP: $msg, ip route add local $local_addr failed"
		return
	fi

	echo "INFO: test $msg"

	TEST_COUNT=10000
	local extra_args="-o TRANSPARENT"
	do_transfer ${listener_ns} ${connector_ns} MPTCP MPTCP \
		    ${connect_addr} ${local_addr} "${extra_args}"
	lret=$?

	ip netns exec "$listener_ns" nft flush ruleset
	ip -net "$listener_ns" $r6flag rule del fwmark 1 lookup 100
	ip -net "$listener_ns" route del local $local_addr/0 dev lo table 100

	if [ $lret -ne 0 ]; then
		echo "FAIL: $msg, mptcp connection error" 1>&2
		ret=$lret
		return 1
	fi

	echo "PASS: $msg"
	return 0
}

run_tests_peekmode()
{
	local peekmode="$1"

	echo "INFO: with peek mode: ${peekmode}"
	run_tests_lo "$ns1" "$ns1" 10.0.1.1 1 "-P ${peekmode}"
	run_tests_lo "$ns1" "$ns1" dead:beef:1::1 1 "-P ${peekmode}"
}

run_tests_disconnect()
{
	local peekmode="$1"
	local old_cin=$cin
	local old_sin=$sin

	cat $cin $cin $cin > "$cin".disconnect

	# force do_transfer to cope with the multiple tranmissions
	sin="$cin.disconnect"
	sin_disconnect=$old_sin
	cin="$cin.disconnect"
	cin_disconnect="$old_cin"
	connect_per_transfer=3

	echo "INFO: disconnect"
	run_tests_lo "$ns1" "$ns1" 10.0.1.1 1 "-I 3 -i $old_cin"
	run_tests_lo "$ns1" "$ns1" dead:beef:1::1 1 "-I 3 -i $old_cin"

	# restore previous status
	cout=$old_cout
	cout_disconnect="$cout".disconnect
	cin=$old_cin
	cin_disconnect="$cin".disconnect
	connect_per_transfer=1
}

display_time()
{
	time_end=$(date +%s)
	time_run=$((time_end-time_start))

	echo "Time: ${time_run} seconds"
}

stop_if_error()
{
	local msg="$1"

	if [ ${ret} -ne 0 ]; then
		echo "FAIL: ${msg}" 1>&2
		display_time
		exit ${ret}
	fi
}

make_file "$cin" "client"
make_file "$sin" "server"

check_mptcp_disabled

stop_if_error "The kernel configuration is not valid for MPTCP"

echo "INFO: validating network environment with pings"
for sender in "$ns1" "$ns2" "$ns3" "$ns4";do
	do_ping "$ns1" $sender 10.0.1.1
	do_ping "$ns1" $sender dead:beef:1::1

	do_ping "$ns2" $sender 10.0.1.2
	do_ping "$ns2" $sender dead:beef:1::2
	do_ping "$ns2" $sender 10.0.2.1
	do_ping "$ns2" $sender dead:beef:2::1

	do_ping "$ns3" $sender 10.0.2.2
	do_ping "$ns3" $sender dead:beef:2::2
	do_ping "$ns3" $sender 10.0.3.2
	do_ping "$ns3" $sender dead:beef:3::2

	do_ping "$ns4" $sender 10.0.3.1
	do_ping "$ns4" $sender dead:beef:3::1
done

stop_if_error "Could not even run ping tests"

[ -n "$tc_loss" ] && tc -net "$ns2" qdisc add dev ns2eth3 root netem loss random $tc_loss delay ${tc_delay}ms
echo -n "INFO: Using loss of $tc_loss "
test "$tc_delay" -gt 0 && echo -n "delay $tc_delay ms "

reorder_delay=$(($tc_delay / 4))

if [ -z "${tc_reorder}" ]; then
	reorder1=$((RANDOM%10))
	reorder1=$((100 - reorder1))
	reorder2=$((RANDOM%100))

	if [ $reorder_delay -gt 0 ] && [ $reorder1 -lt 100 ] && [ $reorder2 -gt 0 ]; then
		tc_reorder="reorder ${reorder1}% ${reorder2}%"
		echo -n "$tc_reorder with delay ${reorder_delay}ms "
	fi
elif [ "$tc_reorder" = "0" ];then
	tc_reorder=""
elif [ "$reorder_delay" -gt 0 ];then
	# reordering requires some delay
	tc_reorder="reorder $tc_reorder"
	echo -n "$tc_reorder with delay ${reorder_delay}ms "
fi

echo "on ns3eth4"

tc -net "$ns3" qdisc add dev ns3eth4 root netem delay ${reorder_delay}ms $tc_reorder

run_tests_lo "$ns1" "$ns1" 10.0.1.1 1
stop_if_error "Could not even run loopback test"

run_tests_lo "$ns1" "$ns1" dead:beef:1::1 1
stop_if_error "Could not even run loopback v6 test"

for sender in $ns1 $ns2 $ns3 $ns4;do
	# ns1<->ns2 is not subject to reordering/tc delays. Use it to test
	# mptcp syncookie support.
	if [ $sender = $ns1 ]; then
		ip netns exec "$ns2" sysctl -q net.ipv4.tcp_syncookies=2
	else
		ip netns exec "$ns2" sysctl -q net.ipv4.tcp_syncookies=1
	fi

	run_tests "$ns1" $sender 10.0.1.1
	run_tests "$ns1" $sender dead:beef:1::1

	run_tests "$ns2" $sender 10.0.1.2
	run_tests "$ns2" $sender dead:beef:1::2
	run_tests "$ns2" $sender 10.0.2.1
	run_tests "$ns2" $sender dead:beef:2::1

	run_tests "$ns3" $sender 10.0.2.2
	run_tests "$ns3" $sender dead:beef:2::2
	run_tests "$ns3" $sender 10.0.3.2
	run_tests "$ns3" $sender dead:beef:3::2

	run_tests "$ns4" $sender 10.0.3.1
	run_tests "$ns4" $sender dead:beef:3::1

	stop_if_error "Tests with $sender as a sender have failed"
done

run_tests_peekmode "saveWithPeek"
run_tests_peekmode "saveAfterPeek"
stop_if_error "Tests with peek mode have failed"

# connect to ns4 ip address, ns2 should intercept/proxy
run_test_transparent 10.0.3.1 "tproxy ipv4"
run_test_transparent dead:beef:3::1 "tproxy ipv6"
stop_if_error "Tests with tproxy have failed"

run_tests_disconnect

display_time
exit $ret