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 31