Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux

selftest: packetdrill: Import opt34/fin-close-socket.pkt.

This imports the non-experimental version of fin-close-socket.pkt.

This file tests the scenario where a TFO child socket's state
transitions from SYN_RECV to CLOSE_WAIT before accept()ed.

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250927213022.1850048-8-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

authored by

Kuniyuki Iwashima and committed by
Jakub Kicinski
5ed080f8 e57b3933

+30
+30
tools/testing/selftests/net/packetdrill/tcp_fastopen_server_fin-close-socket.pkt
··· 1 + // SPDX-License-Identifier: GPL-2.0 2 + // 3 + // Send a FIN pkt with the ACK bit to a TFO socket. 4 + // The socket will go to TCP_CLOSE_WAIT state and data can be 5 + // read until the socket is closed, at which time a FIN will be sent. 6 + 7 + `./defaults.sh` 8 + 9 + 0 socket(..., SOCK_STREAM|SOCK_NONBLOCK, 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 + +0 setsockopt(3, SOL_TCP, TCP_FASTOPEN, [1], 4) = 0 14 + 15 + +0 < S 0:10(10) win 32792 <mss 1460,sackOK,nop,nop,FO TFO_COOKIE,nop,nop> 16 + +0 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK> 17 + 18 + // FIN is acked and the socket goes to TCP_CLOSE_WAIT state 19 + // in tcp_fin() called from tcp_data_queue(). 20 + +0 < F. 11:11(0) ack 1 win 32792 21 + +0 > . 1:1(0) ack 12 22 + 23 + +0 accept(3, ..., ...) = 4 24 + +0 %{ assert (tcpi_options & TCPI_OPT_SYN_DATA) != 0, tcpi_options }% 25 + +0 %{ assert tcpi_state == TCP_CLOSE_WAIT, tcpi_state }% 26 + 27 + +0 read(4, ..., 512) = 10 28 + +0 close(4) = 0 29 + +0 > F. 1:1(0) ack 12 30 + * > F. 1:1(0) ack 12