1// SPDX-License-Identifier: GPL-2.0 2 3// Some TCP stacks send FINs even though the window is closed. We break 4// a possible FIN/ACK loop by accepting the FIN. 5 6--mss=1000 7 8`./defaults.sh` 9 10// Establish a connection. 11 +0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 12 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 13 +0 setsockopt(3, SOL_SOCKET, SO_RCVBUF, [20000], 4) = 0 14 +0 bind(3, ..., ...) = 0 15 +0 listen(3, 1) = 0 16 17 +0 < S 0:0(0) win 32792 <mss 1000,nop,wscale 7> 18 +0 > S. 0:0(0) ack 1 <mss 1460,nop,wscale 0> 19 +0 < . 1:1(0) ack 1 win 257 20 21 +0 accept(3, ..., ...) = 4 22 23 +0 < P. 1:60001(60000) ack 1 win 257 24 * > . 1:1(0) ack 60001 win 0 25 26 +0 < F. 60001:60001(0) ack 1 win 257 27 +0 > . 1:1(0) ack 60002 win 0 28