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selftest: packetdrill: Add tcp_fastopen_server_reset-after-disconnect.pkt.

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The test reproduces the scenario explained in the previous patch.

Without the patch, the test triggers the warning and cannot see the last
retransmitted packet.

  # ./ksft_runner.sh tcp_fastopen_server_reset-after-disconnect.pkt
  TAP version 13
  1..2
  [   29.229250] ------------[ cut here ]------------
  [   29.231414] WARNING: CPU: 26 PID: 0 at net/ipv4/tcp_timer.c:542 tcp_retransmit_timer+0x32/0x9f0
  ...
  tcp_fastopen_server_reset-after-disconnect.pkt:26: error handling packet: Timed out waiting for packet
  not ok 1 ipv4
  tcp_fastopen_server_reset-after-disconnect.pkt:26: error handling packet: Timed out waiting for packet
  not ok 2 ipv6
  # Totals: pass:0 fail:2 xfail:0 xpass:0 skip:0 error:0

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250915175800.118793-3-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kuniyuki Iwashima 2025-09-15 17:56:47 +00:00 committed by Jakub Kicinski
parent 45c8a6cc2b
commit 1fd0362262
1 changed files with 26 additions and 0 deletions
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26
tools/testing/selftests/net/packetdrill/tcp_fastopen_server_reset-after-disconnect.pkt Normal file
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@ -0,0 +1,26 @@
// SPDX-License-Identifier: GPL-2.0
`./defaults.sh
./set_sysctls.py /proc/sys/net/ipv4/tcp_fastopen=0x602 /proc/sys/net/ipv4/tcp_timestamps=0`
0 socket(..., SOCK_STREAM|SOCK_NONBLOCK, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 1) = 0
+0 < S 0:10(10) win 32792 <mss 1460,nop,nop,sackOK>
+0 > S. 0:0(0) ack 11 win 65535 <mss 1460,nop,nop,sackOK>
// sk->sk_state is TCP_SYN_RECV
+.1 accept(3, ..., ...) = 4
// tcp_disconnect() sets sk->sk_state to TCP_CLOSE
+0 connect(4, AF_UNSPEC, ...) = 0
+0 > R. 1:1(0) ack 11 win 65535
// connect() sets sk->sk_state to TCP_SYN_SENT
+0 fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
+0 connect(4, ..., ...) = -1 EINPROGRESS (Operation is now in progress)
+0 > S 0:0(0) win 65535 <mss 1460,nop,nop,sackOK,nop,wscale 8>
// tp->fastopen_rsk must be NULL
+1 > S 0:0(0) win 65535 <mss 1460,nop,nop,sackOK,nop,wscale 8>