Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
selftests/net: packetdrill: import tcp/eor, tcp/splice, tcp/ts_recent, tcp/blocking
Use the standard import and testing method, as described in the
import of tcp/ecn and tcp/close , tcp/sack , tcp/tcp_info.
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Soham Chakradeo <sohamch@google.com>
Link: https://patch.msgid.link/20241217185203.297935-4-sohamch.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
authored by
Soham Chakradeo
and committed by
Jakub Kicinski
6f669205
eab35989
+400
+18
tools/testing/selftests/net/packetdrill/tcp_blocking_blocking-accept.pkt
+18
tools/testing/selftests/net/packetdrill/tcp_blocking_blocking-accept.pkt
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
// Test for blocking accept.
3
+
4
+
`./defaults.sh`
5
+
6
+
// Establish a connection.
7
+
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
8
+
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
9
+
+0 bind(3, ..., ...) = 0
10
+
+0 listen(3, 1) = 0
11
+
+0...0.200 accept(3, ..., ...) = 4
12
+
13
+
+.1 < S 0:0(0) win 32792 <mss 1000,nop,wscale 7>
14
+
+0 > S. 0:0(0) ack 1 <mss 1460,nop,wscale 8>
15
+
+.1 < . 1:1(0) ack 1 win 257
16
+
17
+
+.1 write(4, ..., 2000) = 2000
18
+
+0 > P. 1:2001(2000) ack 1
+13
tools/testing/selftests/net/packetdrill/tcp_blocking_blocking-connect.pkt
+13
tools/testing/selftests/net/packetdrill/tcp_blocking_blocking-connect.pkt
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
// Test for blocking connect.
3
+
4
+
`./defaults.sh`
5
+
6
+
// Establish a connection.
7
+
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
8
+
9
+
+.1...0.200 connect(3, ..., ...) = 0
10
+
11
+
+0 > S 0:0(0) <mss 1460,sackOK,TS val 100 ecr 0,nop,wscale 8>
12
+
+.1 < S. 0:0(0) ack 1 win 5792 <mss 1460,nop,wscale 2,nop,nop,sackOK>
13
+
+0 > . 1:1(0) ack 1
+29
tools/testing/selftests/net/packetdrill/tcp_blocking_blocking-read.pkt
+29
tools/testing/selftests/net/packetdrill/tcp_blocking_blocking-read.pkt
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
// Test for blocking read.
3
+
--tolerance_usecs=10000
4
+
5
+
`./defaults.sh`
6
+
7
+
// Establish a connection.
8
+
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
9
+
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
10
+
+0 bind(3, ..., ...) = 0
11
+
+0 listen(3, 1) = 0
12
+
13
+
+.1 < S 0:0(0) win 32792 <mss 1000,nop,wscale 7>
14
+
+0 > S. 0:0(0) ack 1 <mss 1460,nop,wscale 8>
15
+
+.1 < . 1:1(0) ack 1 win 257
16
+
+0 accept(3, ..., ...) = 4
17
+
18
+
+0...0.100 read(4, ..., 2000) = 2000
19
+
+.1 < P. 1:2001(2000) ack 1 win 257
20
+
+0 > . 1:1(0) ack 2001
21
+
22
+
+.1...0.200 read(4, ..., 2000) = 2000
23
+
+.1 < P. 2001:4001(2000) ack 1 win 257
24
+
+0 > . 1:1(0) ack 4001
25
+
26
+
+.1 < P. 4001:6001(2000) ack 1 win 257
27
+
+0 > . 1:1(0) ack 6001
28
+
+0...0.000 read(4, ..., 1000) = 1000
29
+
+0...0.000 read(4, ..., 1000) = 1000
+35
tools/testing/selftests/net/packetdrill/tcp_blocking_blocking-write.pkt
+35
tools/testing/selftests/net/packetdrill/tcp_blocking_blocking-write.pkt
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
// Test for blocking write.
3
+
--tolerance_usecs=10000
4
+
5
+
`./defaults.sh
6
+
./set_sysctls.py /proc/sys/net/ipv4/tcp_min_tso_segs=10
7
+
`
8
+
9
+
// Establish a connection.
10
+
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
11
+
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
12
+
+0 bind(3, ..., ...) = 0
13
+
+0 listen(3, 1) = 0
14
+
15
+
+.1 < S 0:0(0) win 50000 <mss 1000,nop,wscale 0>
16
+
+0 > S. 0:0(0) ack 1 <mss 1460,nop,wscale 8>
17
+
+.1 < . 1:1(0) ack 1 win 50000
18
+
+0 accept(3, ..., ...) = 4
19
+
20
+
// Kernel doubles our value -> sk->sk_sndbuf is set to 42000
21
+
+0 setsockopt(4, SOL_SOCKET, SO_SNDBUF, [21000], 4) = 0
22
+
+0 getsockopt(4, SOL_SOCKET, SO_SNDBUF, [42000], [4]) = 0
23
+
24
+
// A write of 60000 does not block.
25
+
+0...0.300 write(4, ..., 61000) = 61000 // this write() blocks
26
+
27
+
+.1 < . 1:1(0) ack 10001 win 50000
28
+
29
+
+.1 < . 1:1(0) ack 30001 win 50000
30
+
31
+
// This ACK should wakeup the write(). An ACK of 35001 does not.
32
+
+.1 < . 1:1(0) ack 36001 win 50000
33
+
34
+
// Reset to sysctls defaults.
35
+
`/tmp/sysctl_restore_${PPID}.sh`
+38
tools/testing/selftests/net/packetdrill/tcp_eor_no-coalesce-large.pkt
+38
tools/testing/selftests/net/packetdrill/tcp_eor_no-coalesce-large.pkt
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
// Test TCP does not append any data from consequent writes to the tail
3
+
// skb created for the chunk. The large chunk itself should be packetized as
4
+
// usual.
5
+
`./defaults.sh
6
+
`
7
+
8
+
// Initialize connection
9
+
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
10
+
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
11
+
+0 bind(3, ..., ...) = 0
12
+
+0 listen(3, 1) = 0
13
+
14
+
+0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 10>
15
+
+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
16
+
+.01 < . 1:1(0) ack 1 win 514
17
+
18
+
+0 accept(3, ..., ...) = 4
19
+
20
+
// Write a 10400B chunk to fill the ICW, and have a 400 byte skb sitting on
21
+
// the tail.
22
+
+0 write(4, ..., 10400) = 10400
23
+
24
+
// Write another 10040B chunk with no coalescing options.
25
+
+0 send(4, ..., 10400, MSG_EOR) = 10400
26
+
27
+
// Write a 2KB chunk. This chunk should not be appended to the packets created
28
+
// the previous chunk.
29
+
+0 write(4, ..., 2000) = 2000
30
+
31
+
+0 > P. 1:10001(10000) ack 1
32
+
+.001 < . 1:1(0) ack 10001 win 514
33
+
// Now we have enough room to send out the 2 x 400B packets out.
34
+
+0 > P. 10001:20801(10800) ack 1
35
+
+.001 < . 1:1(0) ack 20801 win 514
36
+
// This 2KB packet should be sent alone.
37
+
+0 > P. 20801:22801(2000) ack 1
38
+
+.001 < . 1:1(0) ack 22801 win 514
+72
tools/testing/selftests/net/packetdrill/tcp_eor_no-coalesce-retrans.pkt
+72
tools/testing/selftests/net/packetdrill/tcp_eor_no-coalesce-retrans.pkt
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
// Test TCP does not append any data from consequent writes to the tail
3
+
// skb created for the chunk. Also, when packets are retransmitted, they
4
+
// will not be coalesce into the same skb.
5
+
`./defaults.sh
6
+
`
7
+
8
+
// Initialize connection
9
+
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
10
+
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
11
+
+0 bind(3, ..., ...) = 0
12
+
+0 listen(3, 1) = 0
13
+
14
+
+0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 10>
15
+
+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
16
+
+.01 < . 1:1(0) ack 1 win 514
17
+
18
+
+0 accept(3, ..., ...) = 4
19
+
20
+
// Write a 10400B chunk to fill the ICW, and have a 400 byte skb sitting on
21
+
// the tail.
22
+
+0 write(4, ..., 10400) = 10400
23
+
24
+
// Write 10 400B chunks with no coalescing options.
25
+
+0 send(4, ..., 400, MSG_EOR) = 400
26
+
+0 send(4, ..., 400, MSG_EOR) = 400
27
+
+0 send(4, ..., 400, MSG_EOR) = 400
28
+
+0 send(4, ..., 400, MSG_EOR) = 400
29
+
+0 send(4, ..., 400, MSG_EOR) = 400
30
+
+0 send(4, ..., 400, MSG_EOR) = 400
31
+
+0 send(4, ..., 400, MSG_EOR) = 400
32
+
+0 send(4, ..., 400, MSG_EOR) = 400
33
+
+0 send(4, ..., 400, MSG_EOR) = 400
34
+
+0 send(4, ..., 400, MSG_EOR) = 400
35
+
// This chunk should not be appended to the skbs created for the previous chunk.
36
+
+0 write(4, ..., 10000) = 10000
37
+
38
+
+0 > P. 1:10001(10000) ack 1
39
+
+.001 < . 1:1(0) ack 10001 win 514
40
+
// Now we have enough room to send out the 2 x 400B packets out.
41
+
+0 > P. 10001:10801(800) ack 1
42
+
// The 9 remaining 400B chunks should be sent as individual packets.
43
+
+0 > P. 10801:11201(400) ack 1
44
+
+0 > P. 11201:11601(400) ack 1
45
+
+0 > P. 11601:12001(400) ack 1
46
+
+0 > P. 12001:12401(400) ack 1
47
+
+0 > P. 12401:12801(400) ack 1
48
+
+0 > P. 12801:13201(400) ack 1
49
+
+0 > P. 13201:13601(400) ack 1
50
+
+0 > P. 13601:14001(400) ack 1
51
+
+0 > P. 14001:14401(400) ack 1
52
+
// The last 10KB chunk should be sent separately.
53
+
+0 > P. 14401:24401(10000) ack 1
54
+
55
+
+.001 < . 1:1(0) ack 10401 win 514
56
+
+.001 < . 1:1(0) ack 10801 win 514
57
+
+.001 < . 1:1(0) ack 11201 win 514
58
+
+.001 < . 1:1(0) ack 11601 win 514
59
+
+.001 < . 1:1(0) ack 12001 win 514 <sack 13201:14401,nop,nop>
60
+
// TCP should fill the hole but no coalescing should happen, and all
61
+
// retransmissions should be sent out as individual packets.
62
+
63
+
// Note : This is timeout based retransmit.
64
+
// Do not put +0 here or flakes will come back.
65
+
+.004~+.008 > P. 12001:12401(400) ack 1
66
+
67
+
+.001 < . 1:1(0) ack 12401 win 514 <sack 13201:14401,nop,nop>
68
+
+0 > P. 12401:12801(400) ack 1
69
+
+0 > P. 12801:13201(400) ack 1
70
+
+.001 < . 1:1(0) ack 12801 win 514 <sack 13201:14401,nop,nop>
71
+
+.001 < . 1:1(0) ack 14401 win 514
72
+
+.001 < . 1:1(0) ack 24401 win 514
+36
tools/testing/selftests/net/packetdrill/tcp_eor_no-coalesce-small.pkt
+36
tools/testing/selftests/net/packetdrill/tcp_eor_no-coalesce-small.pkt
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
// Test TCP does not append any data from consequent writes to the tail
3
+
// skb created for the chunk.
4
+
`./defaults.sh
5
+
`
6
+
7
+
// Initialize connection
8
+
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
9
+
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
10
+
+0 bind(3, ..., ...) = 0
11
+
+0 listen(3, 1) = 0
12
+
13
+
+0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 10>
14
+
+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
15
+
+.01 < . 1:1(0) ack 1 win 514
16
+
17
+
+0 accept(3, ..., ...) = 4
18
+
19
+
// Write a 10400B chunk to fill the ICW, and have a 400 byte skb sitting on
20
+
// the tail.
21
+
+0 write(4, ..., 10400) = 10400
22
+
23
+
// Write a 400B chunk with no coalescing options.
24
+
+0 send(4, ..., 400, MSG_EOR) = 400
25
+
26
+
// This chunk should not be appended to the skbs created for the previous chunk.
27
+
+0 write(4, ..., 10000) = 10000
28
+
29
+
+0 > P. 1:10001(10000) ack 1
30
+
+.001 < . 1:1(0) ack 10001 win 514
31
+
// Now we have enough room to send out the 2 x 400B packets out.
32
+
+0 > P. 10001:10801(800) ack 1
33
+
+0 > P. 10801:20801(10000) ack 1
34
+
+.001 < . 1:1(0) ack 10401 win 514
35
+
+.001 < . 1:1(0) ack 10801 win 514
36
+
+.001 < . 1:1(0) ack 20801 win 514
+66
tools/testing/selftests/net/packetdrill/tcp_eor_no-coalesce-subsequent.pkt
+66
tools/testing/selftests/net/packetdrill/tcp_eor_no-coalesce-subsequent.pkt
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
// Test TCP does not append any data from consequent writes to the tail
3
+
// skb created for the chunk even though we have 10 back-to-back small
4
+
// writes.
5
+
`./defaults.sh
6
+
`
7
+
8
+
// Initialize connection
9
+
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
10
+
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
11
+
+0 bind(3, ..., ...) = 0
12
+
+0 listen(3, 1) = 0
13
+
14
+
+0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 10>
15
+
+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
16
+
+.01 < . 1:1(0) ack 1 win 514
17
+
18
+
+0 accept(3, ..., ...) = 4
19
+
20
+
// Write a 10400B chunk to fill the ICW, and have a 400 byte skb sitting on
21
+
// the tail.
22
+
+0 write(4, ..., 10400) = 10400
23
+
24
+
// Write 10 400B chunks with no coalescing options.
25
+
+0 send(4, ..., 400, MSG_EOR) = 400
26
+
+0 send(4, ..., 400, MSG_EOR) = 400
27
+
+0 send(4, ..., 400, MSG_EOR) = 400
28
+
+0 send(4, ..., 400, MSG_EOR) = 400
29
+
+0 send(4, ..., 400, MSG_EOR) = 400
30
+
+0 send(4, ..., 400, MSG_EOR) = 400
31
+
+0 send(4, ..., 400, MSG_EOR) = 400
32
+
+0 send(4, ..., 400, MSG_EOR) = 400
33
+
+0 send(4, ..., 400, MSG_EOR) = 400
34
+
+0 send(4, ..., 400, MSG_EOR) = 400
35
+
// This chunk should not be appended to the skbs created for the previous chunk.
36
+
+0 write(4, ..., 10000) = 10000
37
+
38
+
+0 > P. 1:10001(10000) ack 1
39
+
+.001 < . 1:1(0) ack 10001 win 514
40
+
// Now we have enough room to send out the 2 x 400B packets out.
41
+
+0 > P. 10001:10801(800) ack 1
42
+
// The 9 remaining 400B chunks should be sent as individual packets.
43
+
+0 > P. 10801:11201(400) ack 1
44
+
+0 > P. 11201:11601(400) ack 1
45
+
+0 > P. 11601:12001(400) ack 1
46
+
+0 > P. 12001:12401(400) ack 1
47
+
+0 > P. 12401:12801(400) ack 1
48
+
+0 > P. 12801:13201(400) ack 1
49
+
+0 > P. 13201:13601(400) ack 1
50
+
+0 > P. 13601:14001(400) ack 1
51
+
+0 > P. 14001:14401(400) ack 1
52
+
// The last 10KB chunk should be sent separately.
53
+
+0 > P. 14401:24401(10000) ack 1
54
+
55
+
+.001 < . 1:1(0) ack 10401 win 514
56
+
+.001 < . 1:1(0) ack 10801 win 514
57
+
+.001 < . 1:1(0) ack 11201 win 514
58
+
+.001 < . 1:1(0) ack 11601 win 514
59
+
+.001 < . 1:1(0) ack 12001 win 514
60
+
+.001 < . 1:1(0) ack 12401 win 514
61
+
+.001 < . 1:1(0) ack 12801 win 514
62
+
+.001 < . 1:1(0) ack 13201 win 514
63
+
+.001 < . 1:1(0) ack 13601 win 514
64
+
+.001 < . 1:1(0) ack 14001 win 514
65
+
+.001 < . 1:1(0) ack 14401 win 514
66
+
+.001 < . 1:1(0) ack 24401 win 514
+20
tools/testing/selftests/net/packetdrill/tcp_splice_tcp_splice_loop_test.pkt
+20
tools/testing/selftests/net/packetdrill/tcp_splice_tcp_splice_loop_test.pkt
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
`./defaults.sh`
3
+
4
+
// Initialize a server socket
5
+
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
6
+
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
7
+
+0 setsockopt(3, SOL_IP, IP_FREEBIND, [1], 4) = 0
8
+
+0 bind(3, ..., ...) = 0
9
+
+0 listen(3, 1) = 0
10
+
11
+
// Connection should get accepted
12
+
+0 < S 0:0(0) win 32972 <mss 1460,nop,wscale 7>
13
+
+0 > S. 0:0(0) ack 1 <...>
14
+
+0 < . 1:1(0) ack 1 win 257
15
+
+0 accept(3, ..., ...) = 4
16
+
17
+
+0 pipe([5, 6]) = 0
18
+
+0 < U. 1:101(100) ack 1 win 257 urg 100
19
+
+0 splice(4, NULL, 6, NULL, 99, 0) = 99
20
+
+0 splice(4, NULL, 6, NULL, 1, 0) = 0
+23
tools/testing/selftests/net/packetdrill/tcp_ts_recent_fin_tsval.pkt
+23
tools/testing/selftests/net/packetdrill/tcp_ts_recent_fin_tsval.pkt
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
// Test that we send FIN packet with correct TSval
3
+
--tcp_ts_tick_usecs=1000
4
+
--tolerance_usecs=7000
5
+
6
+
`./defaults.sh`
7
+
8
+
// Create a socket.
9
+
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
10
+
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
11
+
12
+
+0 bind(3, ..., ...) = 0
13
+
+0 listen(3, 1) = 0
14
+
15
+
// Establish a connection.
16
+
+0 < S 0:0(0) win 20000 <mss 1000,sackOK,TS val 100 ecr 0>
17
+
+0 > S. 0:0(0) ack 1 <mss 1460,sackOK,TS val 100 ecr 100>
18
+
+.1 < . 1:1(0) ack 1 win 20000 <nop,nop,TS val 200 ecr 100>
19
+
+0 accept(3, ..., ...) = 4
20
+
21
+
+1 close(4) = 0
22
+
// Check that FIN TSval is updated properly, one second has passed since last sent packet.
23
+
+0 > F. 1:1(0) ack 1 <nop,nop,TS val 1200 ecr 200>
+25
tools/testing/selftests/net/packetdrill/tcp_ts_recent_invalid_ack.pkt
+25
tools/testing/selftests/net/packetdrill/tcp_ts_recent_invalid_ack.pkt
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
// Test that we reject TS val updates on a packet with invalid ACK sequence
3
+
4
+
`./defaults.sh
5
+
`
6
+
7
+
// Create a socket.
8
+
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
9
+
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
10
+
11
+
+0 bind(3, ..., ...) = 0
12
+
+0 listen(3, 1) = 0
13
+
14
+
// Establish a connection.
15
+
+.1 < S 0:0(0) win 20000 <mss 1000,sackOK,TS val 100 ecr 0>
16
+
+0 > S. 0:0(0) ack 1 <mss 1460,sackOK,TS val 100 ecr 100>
17
+
+.1 < . 1:1(0) ack 1 win 20000 <nop,nop,TS val 200 ecr 100>
18
+
+0 accept(3, ..., ...) = 4
19
+
20
+
// bad packet with high tsval (its ACK sequence is above our sndnxt)
21
+
+0 < F. 1:1(0) ack 9999 win 20000 <nop,nop,TS val 200000 ecr 100>
22
+
23
+
24
+
+0 < . 1:1001(1000) ack 1 win 20000 <nop,nop,TS val 201 ecr 100>
25
+
+0 > . 1:1(0) ack 1001 <nop,nop,TS val 200 ecr 201>
+25
tools/testing/selftests/net/packetdrill/tcp_ts_recent_reset_tsval.pkt
+25
tools/testing/selftests/net/packetdrill/tcp_ts_recent_reset_tsval.pkt
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
// Test that we send RST packet with correct TSval
3
+
--tcp_ts_tick_usecs=1000
4
+
5
+
`./defaults.sh`
6
+
7
+
// Create a socket.
8
+
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
9
+
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
10
+
11
+
+0 bind(3, ..., ...) = 0
12
+
+0 listen(3, 1) = 0
13
+
14
+
// Establish a connection.
15
+
+0 < S 0:0(0) win 20000 <mss 1000,sackOK,TS val 100 ecr 0>
16
+
+0 > S. 0:0(0) ack 1 <mss 1460,sackOK,TS val 100 ecr 100>
17
+
+.1 < . 1:1(0) ack 1 win 20000 <nop,nop,TS val 200 ecr 100>
18
+
+0 accept(3, ..., ...) = 4
19
+
20
+
+0 < . 1:1001(1000) ack 1 win 20000 <nop,nop,TS val 201 ecr 100>
21
+
+0 > . 1:1(0) ack 1001 <nop,nop,TS val 200 ecr 201>
22
+
23
+
+1 close(4) = 0
24
+
// Check that RST TSval is updated properly, one second has passed since last sent packet.
25
+
+0 > R. 1:1(0) ack 1001 <nop,nop,TS val 1200 ecr 201>